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iOS 简单的学生管理系统（增删改查）
阅读量：4141 次
发布时间：2019-05-25

本文共 50951 字，大约阅读时间需要 169 分钟。

思路

  • 这个简单的学生管理系统学生信息只有姓名，班级，年龄
  • 我在app执行时加了个开始界面，在AppDelegate.m 中将根视图设为需要显示的开机界面即可
  • 首先写登陆注册界面，注册需要查重，并转到登陆界面时要传值，传值可看我的博客
  • 进入app后显示学生信息及要进行的操作，跳转界面即可

难点

  • 因为学生信息是统一的，执行过程中涉及到很多传值问题，正传反传一定要清楚
  • 查找时可以按姓名查找，按班级查找，按年龄查找；也可按班级和年龄查找等两者自由组合，也可三个一起查找

代码

我在这里放了每个功能的代码，推荐大家只看一个理解了就不必再看了，多了也繁琐，不如自己尝试，绝知此事要躬行嘛

因为界面比较多，为了方便理解，效果图就放在各段代码的后面

GitHub地址：

开始界面的设置（根视图的修改）：

在AppDelegate.m 中修改方法 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override point for customization after application launch.        self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyWindow];        ShowViewController *root = [[ShowViewController alloc] init];    self.window.rootViewController = root;        return YES;}

然后在 ShowViewController.m 中：

#import "ShowViewController.h"#import "LoadViewController.h"@interface ShowViewController ()@end@implementation ShowViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.        UILabel *label = [[UILabel alloc] init];    [self.view addSubview:label];    label.text = @"学生管理系统";    label.textColor = [UIColor whiteColor];    label.frame = CGRectMake(0, 210, 414, 40);    label.textAlignment = NSTextAlignmentCenter;    label.font = [UIFont systemFontOfSize:27];        UILabel *label1 = [[UILabel alloc] init];    [self.view addSubview:label1];    label1.text = @"TAY的";    label1.textColor = [UIColor whiteColor];    label1.frame = CGRectMake(0, 150, 414, 40);    label1.textAlignment = NSTextAlignmentCenter;    label1.font = [UIFont systemFontOfSize:38];        UILabel *label2 = [[UILabel alloc] init];    [self.view addSubview:label2];    label2.text = @"TangAoyang's Student Management System";    label2.numberOfLines = 0;    label2.font = [UIFont systemFontOfSize:20];    label2.textColor = [UIColor whiteColor];    label2.frame = CGRectMake(0, 260, [UIScreen mainScreen].bounds.size.width, 30);    label2.textAlignment = NSTextAlignmentCenter;        UIImage *zyyImage = [UIImage imageNamed:@"zyy.jpg"];    UIImageView *zyyImageView = [[UIImageView alloc] initWithImage:zyyImage];    zyyImageView.frame = CGRectMake(0, [UIScreen mainScreen].bounds.size.height / 3, [UIScreen mainScreen].bounds.size.width, 280);    [self.view addSubview:zyyImageView];        self.view.backgroundColor = [UIColor blackColor];    //两秒后执行函数    //P1:需要执行的函数    //P2:执行对象    //P3:时间（单位是秒）    [self performSelector:@selector(next) withObject:self afterDelay:2];}- (void)next {        LoadViewController *root = [[LoadViewController alloc] init];    self.view.window.rootViewController = root;    }

效果：（两秒后跳转到登陆界面）

在这里插入图片描述

正式进来后首先是登陆界面

在LoadViewController.h 中：

#import 
   
    #import "RegisterViewController.h"NS_ASSUME_NONNULL_BEGIN@interface LoadViewController : UIViewController
    
     @property UITextField *userTextField;@property UITextField *passTextField;@property UIButton *loadButton;@property UIButton *registerButton;@end

在 LoadViewController.m 中：

#import "LoadViewController.h"#import "RegisterViewController.h"#import "FirstViewController.h"@interface LoadViewController ()
   
    {    NSString *userStr;    NSString *passStr;    NSMutableArray *userArr;    NSMutableArray *passArr;}@end@implementation LoadViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.        UIImage *backgroundImage = [UIImage imageNamed:@"背景7.jpg"];    UIImageView *backgroundImageView = [[UIImageView alloc] initWithImage:backgroundImage];    backgroundImageView.frame = self.view.bounds;    [self.view insertSubview:backgroundImageView atIndex:0];        UIImage *lineImage = [UIImage imageNamed:@"竖线.png"];    UIImageView *lineImageView = [[UIImageView alloc] initWithImage:lineImage];    lineImageView.frame = CGRectMake(45, 10, 10, 30);        UIImage *userImage = [UIImage imageNamed:@"用户.png"];    UIImageView *userImageView = [[UIImageView alloc] initWithImage:userImage];    userImageView.frame = CGRectMake(0, 0, 45, 45);        UIView *user_View = [[UIView alloc] init];    user_View.frame = CGRectMake(0, 0, 55, 50);    [user_View addSubview:userImageView];    [user_View addSubview:lineImageView];        _userTextField = [[UITextField alloc] init];    _userTextField.placeholder = @"请输入账号";    _userTextField.textColor = [UIColor whiteColor];    _userTextField.tintColor = [UIColor whiteColor];    _userTextField.borderStyle = UITextBorderStyleLine;    _userTextField.layer.masksToBounds = YES;    _userTextField.layer.cornerRadius = 5;    _userTextField.layer.borderWidth = 2;    _userTextField.layer.borderColor = [UIColor whiteColor].CGColor;    _userTextField.backgroundColor = [UIColor clearColor];    [self.view addSubview:_userTextField];    _userTextField.delegate = self;    _userTextField.frame = CGRectMake(50, 370, 320, 55);    _userTextField.keyboardType = UIKeyboardTypeDefault;    _userTextField.leftViewMode = UITextFieldViewModeAlways;    _userTextField.leftView = user_View;        UIImageView *lineImageView2 = [[UIImageView alloc] initWithImage:lineImage];    lineImageView2.frame = CGRectMake(45, 10, 10, 30);        UIImage *passImage = [UIImage imageNamed:@"密码.png"];    UIImageView *passImageView = [[UIImageView alloc] initWithImage:passImage];    passImageView.frame = CGRectMake(0, 0, 45, 45);        UIView *pass_View = [[UIView alloc] init];    pass_View.frame = CGRectMake(0, 0, 55, 50);    [pass_View addSubview:passImageView];    [pass_View addSubview:lineImageView2];        _passTextField = [[UITextField alloc] init];    _passTextField.tintColor = [UIColor whiteColor];    _passTextField.textColor = [UIColor whiteColor];    _passTextField.placeholder = @"请输入密码";    _passTextField.borderStyle = UITextBorderStyleRoundedRect;    _passTextField.layer.masksToBounds = YES;    _passTextField.layer.cornerRadius = 5;    _passTextField.layer.borderWidth = 2;    _passTextField.layer.borderColor = [UIColor whiteColor].CGColor;    [self.view addSubview:_passTextField];    _passTextField.backgroundColor = [UIColor clearColor];    _passTextField.delegate = self;    _passTextField.frame = CGRectMake(50, 450, 320, 55);    _passTextField.keyboardType = UIKeyboardTypeDefault;    _passTextField.secureTextEntry = YES;    _passTextField.leftViewMode = UITextFieldViewModeAlways;    _passTextField.leftView = pass_View;        _loadButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    _loadButton.frame = CGRectMake(80, 525, 100, 35);    _loadButton.titleLabel.font = [UIFont systemFontOfSize:23];    [_loadButton setTitle:@"登陆" forState:UIControlStateNormal];    [_loadButton addTarget:self action:@selector(pressLoad) forControlEvents:UIControlEventTouchDown];    [self.view addSubview:_loadButton];    _loadButton.tintColor = [UIColor whiteColor];        _registerButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:_registerButton];    _registerButton.frame = CGRectMake(235, 525, 100, 35);    _registerButton.titleLabel.font = [UIFont systemFontOfSize:23];    _registerButton.tintColor = [UIColor whiteColor];    [_registerButton setTitle:@"注册" forState:UIControlStateNormal];    [_registerButton addTarget:self action:@selector(pressRegister) forControlEvents:UIControlEventTouchDown];        userArr = [[NSMutableArray alloc] init];    [userArr addObject:@"111"];    [userArr addObject:@"222"];    [userArr addObject:@"333"];    [userArr addObject:@"444"];    passArr = [[NSMutableArray alloc] init];    [passArr addObject:@"aaa"];    [passArr addObject:@"sss"];    [passArr addObject:@"ddd"];    [passArr addObject:@"fff"];    }- (void)pressLoad{        int i ;    for(i = 0; i < userArr.count; i++) {        if([_userTextField.text isEqualToString:userArr[i]] && [_passTextField.text isEqualToString:passArr[i]]) {            FirstViewController *firstRoot = [[FirstViewController alloc] init];            self.view.window.rootViewController = firstRoot;        }    }    if(i == userArr.count){        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"警告" message:@"账号与密码不匹配!" preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleCancel handler:nil];        [alert addAction:sureAction];        [self presentViewController:alert animated:NO completion:nil];    }}- (void)touchesBegan:(NSSet
    
      *)touches withEvent:(UIEvent *)event {    [self.view endEditing:YES];}- (BOOL)textFieldShouldReturn:(UITextField *)textField {    if(textField == _userTextField) {        [_passTextField becomeFirstResponder];    }    if(textField == _passTextField) {        [textField resignFirstResponder];    }    return YES;    }- (void)pressRegister{        RegisterViewController *registerViewController = [[RegisterViewController alloc] init];    //反传的代理    registerViewController.regiserViewControllerDelegate = self;    //利用属性正传    registerViewController.RuserArr = userArr;    registerViewController.RpassArr = passArr;    [self presentViewController:registerViewController animated:NO completion:nil];    }//协议方法- (void)pass1:(NSString *)str1 pass2:(NSString *)str2 {        _userTextField.text = str1;    _passTextField.text = str2;    }

登陆界面显示效果图：

在这里插入图片描述
密码与账号不匹配的警告：
在这里插入图片描述
下来是注册界面（注册完后返回登陆在登陆框上显示，如果有重复的账号显示提示框，并且未成功注册）
在 RegisterViewController.h 中：

#import 
   
    NS_ASSUME_NONNULL_BEGIN@protocol RegisterViewControllerDelegate 
    
     - (void)pass1:(NSString *)str1 pass2:(NSString *)str2;@end@interface RegisterViewController : UIViewController
     
      @property (nonatomic, weak) id 
      
        regiserViewControllerDelegate;@property UITextField *messTextField;@property UITextField *userTextField;@property UITextField *passTextField;@property NSMutableArray *RuserArr;@property NSMutableArray *RpassArr;@end

在 RegisterViewController.m 中：

#import "RegisterViewController.h"@interface RegisterViewController (){    NSArray *numArr;    NSArray *nameArr;}@end@implementation RegisterViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    UIImage *backgroundImage = [UIImage imageNamed:@"背景7.jpg"];    UIImageView *backgroundImageView = [[UIImageView alloc] initWithImage:backgroundImage];    backgroundImageView.frame = self.view.bounds;    [self.view insertSubview:backgroundImageView atIndex:0];        UIImage *messImage = [UIImage imageNamed:@"邮箱.png"];    UIImageView *messImageView = [[UIImageView alloc] initWithImage:messImage];    messImageView.frame = CGRectMake(5, 0, 40, 40);    UIImage *lineImage = [UIImage imageNamed:@"竖线.png"];    UIImageView *lineImageView = [[UIImageView alloc] initWithImage:lineImage];    lineImageView.frame = CGRectMake(45, 10, 10, 30);    UIView *mess_View = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 55, 50)];    [mess_View addSubview:lineImageView];    [mess_View addSubview:messImageView];        _messTextField = [[UITextField alloc] init];    [self.view addSubview:_messTextField];    _messTextField.delegate = self;    _messTextField.tintColor = [UIColor whiteColor];    _messTextField.textColor = [UIColor whiteColor];    _messTextField.placeholder = @"请输入你的邮箱";    _messTextField.layer.masksToBounds = YES;    _messTextField.layer.cornerRadius = 5;    _messTextField.layer.borderWidth = 2;    _messTextField.frame = CGRectMake(50, 300, 300, 55);    _messTextField.borderStyle = UITextBorderStyleRoundedRect;    _messTextField.layer.borderColor = [UIColor whiteColor].CGColor;    _messTextField.backgroundColor = [UIColor clearColor];    _messTextField.leftViewMode = UITextFieldViewModeAlways;    _messTextField.leftView = mess_View;        UIImage *userImage = [UIImage imageNamed:@"用户.png"];    UIImageView *userImageView = [[UIImageView alloc] initWithImage:userImage];    userImageView.frame = CGRectMake(5, 0, 40, 40);    UIImageView *lineView2 = [[UIImageView alloc] initWithImage:lineImage];    lineView2.frame = CGRectMake(45, 10, 10, 30);    UIView *user_View = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 55, 50)];    [user_View addSubview:lineView2];    [user_View addSubview:userImageView];        _userTextField = [[UITextField alloc] init];    [self.view addSubview:_userTextField];    _userTextField.delegate = self;    _userTextField.tintColor = [UIColor whiteColor];    _userTextField.textColor = [UIColor whiteColor];    _userTextField.placeholder = @"请输入账号";    _userTextField.backgroundColor = [UIColor clearColor];    _userTextField.frame = CGRectMake(50, 375, 300, 55);    _userTextField.borderStyle = UITextBorderStyleRoundedRect;    _userTextField.layer.masksToBounds = YES;    _userTextField.layer.cornerRadius = 5;    _userTextField.layer.borderWidth = 2;    _userTextField.layer.borderColor = [UIColor whiteColor].CGColor;    _userTextField.leftViewMode = UITextFieldViewModeAlways;    _userTextField.leftView = user_View;        UIImage *passImage = [UIImage imageNamed:@"密码.png"];    UIImageView *passImageView = [[UIImageView alloc] initWithImage:passImage];    passImageView.frame = CGRectMake(5, 0, 40, 40);    UIImageView *lineImageView3 = [[UIImageView alloc] initWithImage:lineImage];    lineImageView3.frame = CGRectMake(45, 10, 10, 30);    UIView *pass_View = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 55, 50)];    [pass_View addSubview:passImageView];    [pass_View addSubview:lineImageView3];        _passTextField = [[UITextField alloc] init];    [self.view addSubview:_passTextField];    _passTextField.delegate = self;    _passTextField.secureTextEntry = YES;    _passTextField.tintColor = [UIColor whiteColor];    _passTextField.textColor = [UIColor whiteColor];    _passTextField.placeholder = @"请输入密码";    _passTextField.keyboardType = UIKeyboardTypeDefault;    _passTextField.layer.masksToBounds = YES;    _passTextField.layer.cornerRadius = 5;    _passTextField.layer.borderWidth = 2;    _passTextField.backgroundColor = [UIColor clearColor];    _passTextField.frame = CGRectMake(50, 450, 300, 55);    _passTextField.borderStyle = UITextBorderStyleRoundedRect;    _passTextField.layer.borderColor = [UIColor whiteColor].CGColor;    _passTextField.leftViewMode = UITextFieldViewModeAlways;    _passTextField.leftView = pass_View;        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:button];    [button setTitle:@"返回登陆" forState:UIControlStateNormal];    button.titleLabel.font = [UIFont systemFontOfSize:23];    button.tintColor = [UIColor whiteColor];    button.layer.backgroundColor = [UIColor clearColor].CGColor;    button.frame = CGRectMake(195, 530, 100, 50);    [button addTarget:self action:@selector(pressBtn) forControlEvents:UIControlEventTouchDown];        UIButton *Rbutton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:Rbutton];    [Rbutton setTitle:@"注册" forState:UIControlStateNormal];    Rbutton.titleLabel.font = [UIFont systemFontOfSize:23];    Rbutton.tintColor = [UIColor whiteColor];    Rbutton.layer.backgroundColor = [UIColor clearColor].CGColor;    Rbutton.frame = CGRectMake(85, 530, 100, 50);    [Rbutton addTarget:self action:@selector(pressRBtn) forControlEvents:UIControlEventTouchDown];        }- (void)pressBtn{        [self.view endEditing:YES];    [self dismissViewControllerAnimated:NO completion:nil];    //代理返回值    if([_regiserViewControllerDelegate respondsToSelector:@selector(pass1:pass2:)]) {        [_regiserViewControllerDelegate pass1:_userTextField.text pass2:_passTextField.text];    }    }- (void)pressRBtn{        int i;    //查重    for(i = 0; i < _RuserArr.count; i++){        if([_userTextField.text isEqualToString:_RuserArr[i]]){            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"警告" message:@"账号重复！" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleCancel handler:nil];            [alert addAction:sure];            [self presentViewController:alert animated:NO completion:nil];            break;        }    }    //如果没有重复    if(i == _RuserArr.count){        UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示" message:@"注册成功，请重新登录！" preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleCancel handler:nil];        [alert1 addAction:sure1];        [self presentViewController:alert1 animated:NO completion:nil];        [_RuserArr addObject:_userTextField.text];        [_RpassArr addObject:_passTextField.text];    }}//按return键进入下一个textField- (BOOL)textFieldShouldReturn:(UITextField *)textField {        if(textField == _messTextField) {        [_userTextField becomeFirstResponder];    }    if(textField == _userTextField){        [_passTextField becomeFirstResponder];    }    if(textField == _passTextField){        [textField resignFirstResponder];    }        return YES;    }//点击空白处键盘回收- (void)touchesBegan:(NSSet
   
     *)touches withEvent:(UIEvent *)event {        [_messTextField endEditing:YES];    [_passTextField endEditing:YES];    [_userTextField endEditing:YES];    }

注册效果图：

在这里插入图片描述
输入重复账号的警告：
在这里插入图片描述
下来就要正式进入app啦！
在这里，我定义一个储存信息的类 Student 来存学生信息（为了方便起见）
在 Student.h 中：

#import 
   
    NS_ASSUME_NONNULL_BEGIN@interface Student : NSObject@property NSString *nameStr;@property NSString *classStr;@property NSString *ageStr;@end

增删改都自定义了协议（为了反传值），查不需要传值，故没有协议

进入后首页：
在 FirstViewController.h 中：

#import 
   
    #import "AddViewController.h"#import "DeleteViewController.h"#import "ChangeViewController.h"#import "Student.h"NS_ASSUME_NONNULL_BEGIN@class Student;@interface FirstViewController : UIViewController
    @property UITableView *tableView;@property NSMutableArray *nameArr;@property NSMutableArray *ageArr;@property NSMutableArray *classArr;@property NSMutableArray *stuArr;@end

在 FirstViewController.m 中：

#import "FirstViewController.h"#import "FirstTableViewCell.h"#import "AddViewController.h"#import "DeleteViewController.h"#import "ChangeViewController.h"#import "FindViewController.h"#import "Student.h"@interface FirstViewController ()@end@implementation FirstViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.        UIImage *backImage = [UIImage imageNamed:@"背景10.jpg"];    UIImageView *backImageView = [[UIImageView alloc] initWithImage:backImage];    backImageView.frame = self.view.bounds;    [self.view insertSubview:backImageView atIndex:0];        _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height - 500) style:UITableViewStylePlain];    [self.view addSubview:_tableView];    _tableView.dataSource = self;    _tableView.delegate = self;    _tableView.backgroundColor = [UIColor clearColor];    _tableView.tableFooterView = [[UIView alloc] init];    [_tableView registerClass:[FirstTableViewCell class] forCellReuseIdentifier:@"111"];        UIButton *addButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:addButton];    addButton.frame = CGRectMake(100, 570, 100, 50);    [addButton setTitle:@"add" forState:UIControlStateNormal];    addButton.tintColor = [UIColor whiteColor];    addButton.titleLabel.font = [UIFont systemFontOfSize:30];    [addButton addTarget:self action:@selector(add) forControlEvents:UIControlEventTouchDown];        UIButton *deleteButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:deleteButton];    deleteButton.frame = CGRectMake(250, 570, 100, 50);    [deleteButton setTitle:@"delete" forState:UIControlStateNormal];    deleteButton.tintColor = [UIColor whiteColor];    deleteButton.titleLabel.font = [UIFont systemFontOfSize:30];    [deleteButton addTarget:self action:@selector(delete) forControlEvents:UIControlEventTouchDown];        UIButton *changeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:changeButton];    changeButton.frame = CGRectMake(100, 640, 100, 50);    [changeButton setTitle:@"change" forState:UIControlStateNormal];    changeButton.tintColor = [UIColor whiteColor];    changeButton.titleLabel.font = [UIFont systemFontOfSize:30];    [changeButton addTarget:self action:@selector(change) forControlEvents:UIControlEventTouchDown];        UIButton *findButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:findButton];    findButton.frame = CGRectMake(250, 640, 100, 50);    [findButton setTitle:@"find" forState:UIControlStateNormal];    findButton.tintColor = [UIColor whiteColor];    findButton.titleLabel.font = [UIFont systemFontOfSize:30];    [findButton addTarget:self action:@selector(find) forControlEvents:UIControlEventTouchDown];        UIButton *exitButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:exitButton];    exitButton.frame = CGRectMake(250, 730, 100, 50);    [exitButton setTitle:@"exit" forState:UIControlStateNormal];    exitButton.tintColor = [UIColor whiteColor];    exitButton.titleLabel.font = [UIFont systemFontOfSize:30];    [exitButton addTarget:self action:@selector(exit) forControlEvents:UIControlEventTouchDown];            _nameArr = [[NSMutableArray alloc] init];    [_nameArr addObject:@"张三"];    [_nameArr addObject:@"李四"];    [_nameArr addObject:@"王麻子"];    [_nameArr addObject:@"hahaha"];        _ageArr = [[NSMutableArray alloc ]init];    [_ageArr addObject:@"38"];    [_ageArr addObject:@"250"];    [_ageArr addObject:@"2"];    [_ageArr addObject:@"123"];        _classArr = [[NSMutableArray alloc] init];    [_classArr addObject:@"a班"];    [_classArr addObject:@"b班"];    [_classArr addObject:@"c班"];    [_classArr addObject:@"d班"];        }- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{        FirstTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"111" forIndexPath:indexPath];        [cell give:indexPath Arr1:_nameArr Arr2:_ageArr Arr3:_classArr];        return cell;    }//退出- (void)exit{    exit(0);}//tableView的行数根据学生数目来设- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return _nameArr.count;}- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    return 70;}//增加的点击事件//这四个方法基本相同- (void)add {        AddViewController *addRoot = [[AddViewController alloc] init];    //正传    addRoot.nameArr = _nameArr;    addRoot.ageArr = _ageArr;    addRoot.classArr = _classArr;    //反传的代理    addRoot.addDelegate = self;    [self presentViewController:addRoot animated:NO completion:nil];    }//删除的点击事件- (void)delete {        DeleteViewController *deleteRoot = [[DeleteViewController alloc] init];    deleteRoot.nameArr = _nameArr;    deleteRoot.ageArr = _ageArr;    deleteRoot.classArr = _classArr;    deleteRoot.deleteDelegate = self;    [self presentViewController:deleteRoot animated:NO completion:nil];    }//修改的点击事件- (void)change{        ChangeViewController *changeRoot = [[ChangeViewController alloc] init];    changeRoot.nameArr = _nameArr;    changeRoot.ageArr = _ageArr;    changeRoot.classArr = _classArr;    changeRoot.changeDelegate = self;    [self presentViewController:changeRoot animated:NO completion:nil];    }//查找的点击事件- (void)find{        FindViewController *findRoot = [[FindViewController alloc] init];    findRoot.nameArr = _nameArr;    findRoot.ageArr = _ageArr;    findRoot.classArr = _classArr;    [self presentViewController:findRoot animated:NO completion:nil];    }//增加的代理方法- (void)pass:(Student *)student {        [_nameArr addObject:student.nameStr];    [_ageArr addObject:student.ageStr];    [_classArr addObject:student.classStr];    [_tableView reloadData];    }//删除的代理方法- (void)deletepass1:(NSMutableArray *)nameArr pass2:(NSMutableArray *)ageArr pass3:(NSMutableArray *)classArr{        _nameArr = nameArr;    _ageArr = ageArr;    _classArr = classArr;    [_tableView reloadData];    }//修改的代理方法- (void)changePass1:(NSMutableArray *)nameArr Pass2:(NSMutableArray *)ageArr Pass3:(NSMutableArray *)classArr{        _nameArr = nameArr;    _ageArr = ageArr;    _classArr = classArr;    [_tableView reloadData];    }//点击单元格不显示- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    [tableView deselectRowAtIndexPath:indexPath animated:NO];}

tableview的cell：

在 FirstTableViewCell.h 中：

#import 
   
    NS_ASSUME_NONNULL_BEGIN@interface FirstTableViewCell : UITableViewCell@property UILabel *nameLabel;@property UILabel *classLabel;@property UILabel *ageLabel;- (void)give:(NSIndexPath *)indexPath Arr1:(NSMutableArray *)nameArr Arr2:(NSMutableArray *)ageArr Arr3:(NSMutableArray *)classArr;@endNS_ASSUME_NONNULL_END

在 FirstTableViewCell.m 中：

#import "FirstTableViewCell.h"@implementation FirstTableViewCell//为了方便，代码封装- (void)give:(NSIndexPath *)indexPath Arr1:(NSMutableArray *)nameArr Arr2:(NSMutableArray *)ageArr Arr3:(NSMutableArray *)classArr {    self.nameLabel.text = nameArr[indexPath.row];    self.ageLabel.text = ageArr[indexPath.row];    self.classLabel.text = classArr[indexPath.row];    self.backgroundColor = [UIColor clearColor];}- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{        self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];        _nameLabel = [[UILabel alloc] init];    [self.contentView addSubview:_nameLabel];        _classLabel = [[UILabel alloc] init];    [self.contentView addSubview:_classLabel];        _ageLabel = [[UILabel alloc] init];    [self.contentView addSubview:_ageLabel];        return self;    }- (void)layoutSubviews {        [super layoutSubviews];        _nameLabel.frame = CGRectMake(5, 25, 100, 20);    _nameLabel.font = [UIFont systemFontOfSize:20];    _nameLabel.textAlignment = NSTextAlignmentCenter;    _nameLabel.textColor = [UIColor whiteColor];        _classLabel.frame = CGRectMake(120, 25, 150, 20);    _classLabel.font = [UIFont systemFontOfSize:20];    _classLabel.textAlignment = NSTextAlignmentCenter;    _classLabel.textColor = [UIColor whiteColor];        _ageLabel.frame = CGRectMake(300, 25, 50, 20);    _ageLabel.font = [UIFont systemFontOfSize:20];    _ageLabel.textAlignment = NSTextAlignmentCenter;    _ageLabel.textColor = [UIColor whiteColor];    }- (void)awakeFromNib {    [super awakeFromNib];    // Initialization code}- (void)setSelected:(BOOL)selected animated:(BOOL)animated {    [super setSelected:selected animated:animated];    // Configure the view for the selected state}

效果图：

在这里插入图片描述
增加：（具有查重，并且输入不能为空）
在 AddViewController.h 中：

#import 
   
    #import "Student.h"NS_ASSUME_NONNULL_BEGIN@class Student;@protocol addDelegate 
    
     - (void)pass: (Student *)student;@end@interface AddViewController : UIViewController
     
      @property UITextField *nameTextField;@property UITextField *classTextField;@property UITextField *ageTextField;@property NSMutableArray *nameArr;@property NSMutableArray *ageArr;@property NSMutableArray *classArr;@property UITableView *tableView;@property id 
      
        addDelegate;@end

在 AddViewController.m 中：

#import "AddViewController.h"#import "FirstTableViewCell.h"@interface AddViewController ()@end@implementation AddViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.        UIImage *backImage = [UIImage imageNamed:@"背景13.jpg"];    UIImageView *backImageView = [[UIImageView alloc] initWithImage:backImage];    backImageView.frame = self.view.bounds;    [self.view insertSubview:backImageView atIndex:0];        UIImage *nameImage = [UIImage imageNamed:@"姓名.png"];    UIImageView *nameImageView = [[UIImageView alloc] initWithImage:nameImage];    nameImageView.frame = CGRectMake(3, 3, 45, 45);    _nameTextField = [[UITextField alloc] init];    _nameTextField.layer.masksToBounds = YES;    _nameTextField.layer.cornerRadius = 5;    _nameTextField.layer.borderWidth = 2;    _nameTextField.layer.borderColor = [UIColor whiteColor].CGColor;    _nameTextField.tintColor = [UIColor whiteColor];    _nameTextField.textColor = [UIColor whiteColor];    _nameTextField.backgroundColor = [UIColor clearColor];    _nameTextField.frame = CGRectMake(80, 500, 250, 50);    _nameTextField.placeholder = @"请输入学生姓名";    _nameTextField.leftViewMode = UITextFieldViewModeAlways;    _nameTextField.leftView = nameImageView;    [self.view addSubview:_nameTextField];        UIImage *ageImage = [UIImage imageNamed:@"年龄.png"];    UIImageView *ageImageView = [[UIImageView alloc] initWithImage:ageImage];    ageImageView.frame = CGRectMake(3, 3, 45, 45);    _ageTextField = [[UITextField alloc] initWithFrame:CGRectMake(80, 565, 250, 50)];    [self.view addSubview:_ageTextField];    _ageTextField.placeholder = @"请输入学生年龄";    _ageTextField.layer.masksToBounds = YES;    _ageTextField.layer.borderWidth = 2;    _ageTextField.layer.cornerRadius = 5;    _ageTextField.tintColor = [UIColor whiteColor];    _ageTextField.textColor = [UIColor whiteColor];    _ageTextField.backgroundColor = [UIColor clearColor];    _ageTextField.layer.borderColor = [UIColor whiteColor].CGColor;    _ageTextField.leftViewMode = UITextFieldViewModeAlways;    _ageTextField.leftView = ageImageView;        UIImage *classImage = [UIImage imageNamed:@"房子.png"];    UIImageView *classImageView = [[UIImageView alloc] initWithImage:classImage];    classImageView.frame = CGRectMake(3, 3, 45, 45);    _classTextField = [[UITextField alloc] initWithFrame:CGRectMake(80, 630, 250, 50)];    [self.view addSubview:_classTextField];    _classTextField.placeholder = @"请输入学生班级";    _classTextField.layer.masksToBounds = YES;    _classTextField.layer.borderWidth = 2;    _classTextField.layer.cornerRadius = 5;    _classTextField.tintColor = [UIColor whiteColor];    _classTextField.textColor = [UIColor whiteColor];    _classTextField.backgroundColor = [UIColor clearColor];    _classTextField.layer.borderColor = [UIColor whiteColor].CGColor;    _classTextField.leftViewMode = UITextFieldViewModeAlways;    _classTextField.leftView = classImageView;        UIButton *add = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:add];    add.frame = CGRectMake(110, 700, 80, 30);    add.titleLabel.font = [UIFont systemFontOfSize:25];    [add setTitle:@"完成" forState:UIControlStateNormal];    add.backgroundColor = [UIColor clearColor];    add.tintColor = [UIColor whiteColor];    [add addTarget:self action:@selector(add) forControlEvents:UIControlEventTouchDown];        UIButton *back = [UIButton buttonWithType:UIButtonTypeRoundedRect];    [self.view addSubview:back];    back.frame = CGRectMake(250, 700, 80, 30);    back.titleLabel.font = [UIFont systemFontOfSize:25];    [back setTitle:@"返回" forState:UIControlStateNormal];    back.backgroundColor = [UIColor clearColor];    back.tintColor = [UIColor blackColor];    [back addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchDown];        _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height / 2 - 100) style:UITableViewStylePlain];    [self.view addSubview:_tableView];    _tableView.dataSource = self;    _tableView.delegate = self;    _tableView.backgroundColor = [UIColor clearColor];    _tableView.tableFooterView = [[UIView alloc] init];    [_tableView registerClass:[FirstTableViewCell class] forCellReuseIdentifier:@"111"];        //键盘上移    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];    }- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{        FirstTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"111" forIndexPath:indexPath];    [cell give:indexPath Arr1:_nameArr Arr2:_ageArr Arr3:_classArr];    return cell;    }- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return _nameArr.count;}- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    return 70;}- (void)add{    //判断输入是否有空的    if(_ageTextField.text.length <= 0 || _nameTextField.text.length <= 0 || _classTextField.text.length <= 0){        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"输入不能为空！" preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *sure = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleCancel handler:nil];        [alert addAction:sure];        [self presentViewController:alert animated:NO completion:nil];    } else {        int i;        //查重        for(i = 0; i< _nameArr.count; i++){            if([_nameArr[i] isEqualToString:_nameTextField.text]){                break;            }        }        if(i != _nameArr.count){            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"姓名有重复，请核对后再试！" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleCancel handler:nil];            [alert addAction:sure];            [self presentViewController:alert animated:NO completion:nil];        }        if(i == _nameArr.count){            [self dismissViewControllerAnimated:NO completion:nil];            if([_addDelegate respondsToSelector:@selector(pass:)]) {                Student *stu = [[Student alloc] init];                stu.nameStr = _nameTextField.text;                stu.ageStr = _ageTextField.text;                stu.classStr = _classTextField.text;                [_addDelegate pass:stu];            }        }    }}- (void)back {    [self dismissViewControllerAnimated:NO completion:nil];}- (void)touchesBegan:(NSSet
   
     *)touches withEvent:(UIEvent *)event{    [_nameTextField endEditing:YES];    [_ageTextField endEditing:YES];    [_classTextField endEditing:YES];}- (BOOL)textFieldShouldReturn:(UITextField *)textField {        if(textField == _nameTextField) {        [_ageTextField becomeFirstResponder];    }    if(textField == _ageTextField){        [_classTextField becomeFirstResponder];    }    if(textField == _classTextField){        [textField resignFirstResponder];    }        return YES;    }- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    [tableView deselectRowAtIndexPath:indexPath animated:NO];}-(void)keyboardWillShow : (NSNotification *)notify {    CGFloat kbHeight = [[notify.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;    CGFloat offset = kbHeight - 100;        double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];        if (offset > 0) {        [UIView animateWithDuration:duration animations:^{            self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);        }];    }}-(void)keyboardWillHide: (NSNotification *)notify {    double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] doubleValue];    [UIView animateWithDuration:duration animations:^{        self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);    }];}-(void)dealloc {    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];}

增加界面效果图：

在这里插入图片描述
查重：
在这里插入图片描述
判空：
在这里插入图片描述
删除界面：（可判断是否存在该学生）
在 DeleteViewController.h 中：

#import 
   
    #import "Student.h"NS_ASSUME_NONNULL_BEGIN@class Student;@protocol DeleteDelegate 
    
     - (void)deletepass1:(NSMutableArray *)nameArr pass2:(NSMutableArray *)ageArr pass3:(NSMutableArray *)classArr;@end@interface DeleteViewController : UIViewController
     
      @property UITextField *nameTextField;@property UITableView *tableView;@property NSMutableArray *nameArr;@property NSMutableArray *ageArr;@property NSMutableArray *classArr;@property id 
      
        deleteDelegate;@end

增删改查大同小异，下面三个我只放执行的核心代码了

在 DeleteViewController.m 中：

- (void)delete{	//判断是否存在    for(i = 0; i < _nameArr.count; i++){        if([_nameArr[i] isEqualToString:_nameTextField.text]){            UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"已找到此人，确认是否删除" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action){                [self delete2];            }];            UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"cancel" style:UIAlertActionStyleCancel handler:nil];            [alert addAction:sure];            [alert addAction:cancel];            [self presentViewController:alert animated:NO completion:nil];            break;        }    }    //不存在    if(i == _nameArr.count) {        UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示" message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];        [alert1 addAction:sure1];        [self presentViewController:alert1 animated:NO completion:nil];    }    } //删除操作- (void)delete2{    [_nameArr removeObjectAtIndex:i];    [_ageArr removeObjectAtIndex:i];    [_classArr removeObjectAtIndex:i];    [self dismissViewControllerAnimated:NO completion:nil];    if([_deleteDelegate respondsToSelector:@selector(deletepass1:pass2:pass3:)]){        [_deleteDelegate deletepass1:_nameArr pass2:_ageArr pass3:_classArr];    }}

删除界面：

在这里插入图片描述
判断是否存在：
在这里插入图片描述
若存在操作：
在这里插入图片描述
删除后返回主界面：
在这里插入图片描述
修改：
因为修改需要先判断是否存在若存在再弹出输入修改信息的textField，故为了美观，我分为两个界面来写：

注意：在跳转到第二个界面时，第二个界面的nameTextField上的值应为第一个界面输入的值，且无法编辑。因为用户是使用该学生进入的，无法对别的学生进行操作

在 ChangeViewController.h 中：

#import 
   
    #import "ChangeSonViewController.h"NS_ASSUME_NONNULL_BEGIN@protocol ChangeDelegate 
    
     - (void)changePass1:(NSMutableArray *)nameArr Pass2:(NSMutableArray *)ageArr Pass3:(NSMutableArray *)classArr;@end@interface ChangeViewController : UIViewController
     
      @property UITextField *nameTextField;@property UITableView *tableView;@property NSMutableArray *nameArr;@property NSMutableArray *ageArr;@property NSMutableArray *classArr;@property id 
      
        changeDelegate;@end

在 ChangeViewController.m 中：

逻辑依旧是先判断是否存在，然后进行操作

- (void)change{        int i;    for(i = 0; i < _nameArr.count; i++){        if([_nameArr[i] isEqualToString:_nameTextField.text]){            break;        }    }    if(i != _nameArr.count){        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"存在此人，是否继续修改" preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *sure = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleCancel handler:^(UIAlertAction *_Nonnull action){            ChangeSonViewController *sonRoot = [[ChangeSonViewController alloc] init];            sonRoot.nameArr = self->_nameArr;            sonRoot.ageArr = self->_ageArr;            sonRoot.classArr = self->_classArr;            sonRoot.str = self->_nameTextField.text;            sonRoot.changeSonDelegate = self;            [self presentViewController:sonRoot animated:NO completion:nil];        }];        UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"cancel" style:UIAlertActionStyleDefault handler:nil];        [alert addAction:cancel];        [alert addAction:sure];        [self presentViewController:alert animated:NO completion:nil];    }    if(i == _nameArr.count){        UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示" message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];        UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];        [alert1 addAction:sure1];        [self presentViewController:alert1 animated:NO completion:nil];    }}

判断有无效果图：

在这里插入图片描述
若存在，则跳转下一个界面：
在这里插入图片描述
在 ChangeSonViewController.h 中：

#import 
   
    NS_ASSUME_NONNULL_BEGIN@protocol ChangeSonDelegate 
    
     - (void)changeSonPass1:(NSMutableArray *)nameArr Pass2:(NSMutableArray *)ageArr Pass3:(NSMutableArray *)classArr;@end@interface ChangeSonViewController : UIViewController
     
      @property UITextField *nameTextField;@property UITextField *classTextField;@property UITextField *ageTextField;@property NSMutableArray *nameArr;@property NSMutableArray *ageArr;@property NSMutableArray *classArr;@property NSString *str;@property id 
      
        changeSonDelegate;@end

在 ChangeSonViewController.m 中：

需要有三个textField

- (void)change{    //找到该学生，将修改后的值赋给他    int i;    for(i = 0; i < _nameArr.count; i++){        if([_nameArr[i] isEqualToString:_str]){            [_ageArr replaceObjectAtIndex:i withObject:_ageTextField.text];            [_classArr replaceObjectAtIndex:i withObject:_classTextField.text];        }    }    if([_changeSonDelegate respondsToSelector:@selector(changeSonPass1:Pass2:Pass3:)]){        [_changeSonDelegate changeSonPass1:_nameArr Pass2:_ageArr Pass3:_classArr];    }    [self dismissViewControllerAnimated:NO completion:nil];}

效果图：

此处我将李四的信息修改：
在这里插入图片描述
点击完成：
在这里插入图片描述
修改成功！

最后是查找：

同样，因为要将找到的学生单独显示出来，我新建了一个界面，使用跳转

在 FindViewController.h 中：

#import 
   
    NS_ASSUME_NONNULL_BEGIN@interface FindViewController : UIViewController
    
     @property UITextField *nameTextField;@property UITableView *tableView;@property UITextField *classTextField;@property UITextField *ageTextField;@property NSMutableArray *nameArr;@property NSMutableArray *ageArr;@property NSMutableArray *classArr;@property NSMutableArray *snameArr;@property NSMutableArray *sageArr;@property NSMutableArray *sclassArr;@end

在 FindViewController.m 中：

- (void)find{        _snameArr = [[NSMutableArray alloc] init];    _sageArr = [[NSMutableArray alloc] init];    _sclassArr = [[NSMutableArray alloc] init];    BOOL find = NO;    int i = 0;    int j;    int t;    if((_nameTextField.text.length > 0) && (_ageTextField.text.length <= 0) && (_classTextField.text.length <= 0)){        for(i = 0; i < _nameArr.count; i++){            if([_nameArr[i] isEqualToString:_nameTextField.text]){                find = YES;                [_snameArr addObject:_nameArr[i]];                [_sageArr addObject:_ageArr[i]];                [_sclassArr addObject:_classArr[i]];            }        }        if(find == NO) {            UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示"   message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];            [alert1 addAction:sure1];            [self presentViewController:alert1 animated:NO completion:nil];        }    }        if((_ageTextField.text.length > 0) && (_nameTextField.text.length <= 0) && (_classTextField.text.length <= 0)){        for(j = 0; j < _ageArr.count; j++){            if([_ageArr[j] isEqualToString:_ageTextField.text]){                find = YES;                [_snameArr addObject:_nameArr[j]];                [_sageArr addObject:_ageArr[j]];                [_sclassArr addObject:_classArr[j]];            }        }        if(find == NO) {            UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示" message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];            [alert1 addAction:sure1];            [self presentViewController:alert1 animated:NO completion:nil];        }    }        if((_classTextField.text.length > 0) && (_ageTextField.text.length <= 0) && (_nameTextField.text.length <= 0)){        for(t = 0; t < _classArr.count; t++){            if([_classArr[t] isEqualToString:_classTextField.text]){                find = YES;                [_snameArr addObject:_nameArr[t]];                [_sageArr addObject:_ageArr[t]];                [_sclassArr addObject:_classArr[t]];            }        }        if(find == NO) {            UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示" message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];            [alert1 addAction:sure1];            [self presentViewController:alert1 animated:NO completion:nil];        }    }    if((_nameTextField.text.length > 0) && (_ageTextField.text.length > 0) && (_classTextField.text.length <= 0)){        for(i = 0; i < _nameArr.count; i++){            if([_nameArr[i] isEqualToString:_nameTextField.text] && [_ageArr[i] isEqualToString:_ageTextField.text]){                find = YES;                [_snameArr addObject:_nameArr[i]];                [_sageArr addObject:_ageArr[i]];                [_sclassArr addObject:_classArr[i]];            }        }        if(find == NO) {            UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示"   message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];            [alert1 addAction:sure1];            [self presentViewController:alert1 animated:NO completion:nil];        }    }    if((_nameTextField.text.length > 0) && (_classTextField.text.length > 0) && (_ageTextField.text.length <= 0)){        for(i = 0; i < _nameArr.count; i++){            if([_nameArr[i] isEqualToString:_nameTextField.text] && [_classArr[i] isEqualToString:_classTextField.text]){                find = YES;                [_snameArr addObject:_nameArr[i]];                [_sageArr addObject:_ageArr[i]];                [_sclassArr addObject:_classArr[i]];            }        }        if(find == NO) {            UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示"   message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];            [alert1 addAction:sure1];            [self presentViewController:alert1 animated:NO completion:nil];        }    }    if((_classTextField.text.length > 0) && (_ageTextField.text.length > 0) && (_nameTextField.text.length <= 0)){        for(i = 0; i < _nameArr.count; i++){            if([_classArr[i] isEqualToString:_classTextField.text] && [_ageArr[i] isEqualToString:_ageTextField.text]){                find = YES;                [_snameArr addObject:_nameArr[i]];                [_sageArr addObject:_ageArr[i]];                [_sclassArr addObject:_classArr[i]];            }        }        if(find == NO) {            UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示"   message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];            [alert1 addAction:sure1];            [self presentViewController:alert1 animated:NO completion:nil];        }    }    if((_nameTextField.text.length > 0) && (_classTextField.text.length > 0) && (_ageTextField.text.length > 0)){        for(i = 0; i < _nameArr.count; i++){            if([_nameArr[i] isEqualToString:_nameTextField.text] && [_classArr[i] isEqualToString:_classTextField.text] && [_ageArr[i] isEqualToString:_ageTextField.text]){                find = YES;                [_snameArr addObject:_nameArr[i]];                [_sageArr addObject:_ageArr[i]];                [_sclassArr addObject:_classArr[i]];            }        }        if(find == NO) {            UIAlertController *alert1 = [UIAlertController alertControllerWithTitle:@"提示"   message:@"没找到此人，请确认是否输入正确" preferredStyle:UIAlertControllerStyleAlert];            UIAlertAction *sure1 = [UIAlertAction actionWithTitle:@"sure" style:UIAlertActionStyleDefault handler:nil];            [alert1 addAction:sure1];            [self presentViewController:alert1 animated:NO completion:nil];        }    }    if(find == YES){        FindSonViewController *sonRoot = [[FindSonViewController alloc] init];        sonRoot.nameArr = _snameArr;        sonRoot.ageArr = _sageArr;        sonRoot.classArr = _sclassArr;        [self presentViewController:sonRoot animated:NO completion:nil];    }}

查询效果：

在这里插入图片描述
若存在，则直接跳转界面：
在 FindSonViewController.h 中：

#import 
   
    NS_ASSUME_NONNULL_BEGIN@interface FindSonViewController : UIViewController
    
     @property UILabel *label1;@property UITableView *tableView;@property NSMutableArray *nameArr;@property NSMutableArray *ageArr;@property NSMutableArray *classArr;@end

在 FindSonViewController.m 中：

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.        UIImage *backImage = [UIImage imageNamed:@"背景17.jpg"];    UIImageView *backImageView = [[UIImageView alloc] initWithImage:backImage];    backImageView.frame = self.view.bounds;    [self.view insertSubview:backImageView atIndex:0];        UILabel *label1 = [[UILabel alloc] initWithFrame:CGRectMake(60, 200, 300, 50)];    label1.textColor = [UIColor whiteColor];    label1.tintColor = [UIColor clearColor];    label1.font = [UIFont systemFontOfSize:28];    label1.text = @"您查找的学生信息为：";    [self.view addSubview:label1];        _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 290, [UIScreen mainScreen].bounds.size.width, 550) style:UITableViewStylePlain];    [self.view addSubview:_tableView];    _tableView.backgroundColor = [UIColor clearColor];    _tableView.delegate = self;    _tableView.dataSource = self;    _tableView.tableFooterView = [[UIView alloc] init];    [_tableView registerClass:[FindSonTableViewCell class] forCellReuseIdentifier:@"111"];            UIButton *back = [UIButton buttonWithType:UIButtonTypeRoundedRect];    back.frame = CGRectMake(180, 570, 200, 50);    [self.view addSubview:back];    [back setTitle:@"back" forState:UIControlStateNormal];    back.titleLabel.font = [UIFont systemFontOfSize:25];    back.tintColor = [UIColor whiteColor];    back.backgroundColor = [UIColor clearColor];    [back addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchDown];    }

使用tableView显示，在这里我强迫症，新建了一个cell，其实cell是和 FirstViewController 里 ableview 的cell一样，可用同一个，在这里就不再写了

找到后的界面：
在这里插入图片描述
如果有重复班级之内的：
在这里插入图片描述
这样，一个简单的学生管理系统就完啦

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