【iOS】MVC

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前言

MVC模式的目的是实现一种动态的程序设计，使后续对程序的修改和扩展简化，并且使程序某一部分的重复利用成为可能。除此之外，此模式通过对复杂度的简化，使程序结构更加直观

一、MVC各层职责

1.1、controller层

• 生成view，然后组装view
• 响应View的事件和作为view的代理
• 处理view的生命周期
• 处理界面之间的跳转
• 调用model的数据获取接口，拿到返回数据，处理加工，渲染到view显示

1.2、model层

• 业务逻辑封装
• 提供数据接口给controller使用
• 数据持久化存储和读取
• 作为数据模型存储数据

1.3、view层

• 界面元素搭建，动画效果，数据展示
• 接受用户操作并反馈视觉效果

二、总结

用户点击 View–> 视图响应事件 -->通过代理传递事件到Controller–>发起网络请求更新Model—>Model处理完数据–>代理或通知给Controller–>改变视图样式–>完成

三、优缺点

3.1、优点

通过Controller来控制全局，同时将view和Model的变化分开，对于复杂混乱的项目结构，有了明确的组织方式。

3.2、缺点

随着业务逻辑增加，大量的逻辑代码放进了Controller,导致Controller越来越臃肿，后期维护成本高。

四、代码示例

我们用一个登录注册小demo来实现我们的MVC框架，首先看一下我们的文件命名：

可以看到笔者的登录注册都分别实现了MVC，这里给出以登录的MVC进行讲解

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Model：

//
//  LandModel.h
//  MVC学习
//
//  Created by 夏楠 on 2023/9/9.
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface LandModel : NSObject
@property(nonatomic, copy)NSMutableArray *accoutArray;
@property(nonatomic, copy)NSMutableArray *passwordArray;
- (void)InitLandModel;
@end

NS_ASSUME_NONNULL_END

//
//  LandModel.m
//  MVC学习
//
//  Created by 夏楠 on 2023/9/9.
//

#import "LandModel.h"

@implementation LandModel
- (void)InitLandModel {
    _passwordArray = [[NSMutableArray alloc] init];
    _accoutArray = [[NSMutableArray alloc] init];
}
@end

View：

//
//  LandView.h
//  MVC学习
//
//  Created by 夏楠 on 2023/9/9.
//

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface LandView : UIView
@property(retain, nonatomic)UITextField *textField1;
@property(retain, nonatomic)UITextField *textField2;
@property (nonatomic, strong) UIButton *loginBtn;
@property (nonatomic, strong) UIButton *registeBtn;
- (void)InitView;
@end

NS_ASSUME_NONNULL_END

//
//  LandView.m
//  MVC学习
//
//  Created by 夏楠 on 2023/9/9.
//

#import "LandView.h"

@implementation LandView

- (void)InitView {
    
    //账号
    self.textField1 = [[UITextField alloc]init];
    self.textField1.frame = CGRectMake(60, 350, 280, 40);
    self.textField1.placeholder = @"请输入账号";
    self.textField1.borderStyle = UITextBorderStyleRoundedRect;
    // 设置文本框的圆角
    self.textField1.layer.cornerRadius = self.textField1.bounds.size.height / 2.0;
    self.textField1.layer.masksToBounds = YES;
    self.textField1.backgroundColor = [UIColor whiteColor];  // 设置背景颜色
    self.textField1.layer.borderColor = [UIColor blackColor].CGColor;  // 设置边框颜色
    self.textField1.layer.borderWidth = 1.0;  // 设置边框宽度
    [self.textField1 becomeFirstResponder];
    [self addSubview:self.textField1];
    
    //self.textField1.delegate = self;
//    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
//    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    //用在Controller层
    
    //密码
    self.textField2 = [[UITextField alloc]init];
    self.textField2.frame = CGRectMake(60, 400, 280, 40);
    self.textField2.placeholder = @"请输入密码";
    self.textField2.borderStyle = UITextBorderStyleRoundedRect;
    // 设置文本框的圆角
    self.textField2.layer.cornerRadius = self.textField2.bounds.size.height / 2.0;
    self.textField2.layer.masksToBounds = YES;
    self.textField2.backgroundColor = [UIColor whiteColor];  // 设置背景颜色
    self.textField2.layer.borderColor = [UIColor blackColor].CGColor;  // 设置边框颜色
    self.textField2.layer.borderWidth = 1.0;  // 设置边框宽度
    self.textField2.secureTextEntry = YES;
    [self.textField2 becomeFirstResponder];
    [self addSubview:self.textField2];

//    self.textField2.delegate = self;
//    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
//    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    //用在Controller层

    _loginBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    _loginBtn.frame = CGRectMake(80, 480, 80, 40);
    _loginBtn.layer.cornerRadius = _loginBtn.frame.size.height / 6.0;
    _loginBtn.layer.masksToBounds = YES;
    _loginBtn.layer.borderWidth = 2.0;
    _loginBtn.layer.borderColor = [UIColor whiteColor].CGColor;
    [_loginBtn setTitle:@"登陆" forState:UIControlStateNormal];
    _loginBtn.tintColor = [UIColor blackColor];
    _loginBtn.titleLabel.font = [UIFont systemFontOfSize:20];
    _loginBtn.layer.borderColor = [UIColor blackColor].CGColor;  // 设置边框颜色
    [self addSubview:self.loginBtn];
    
//    [_loginBtn addTarget:self action:@selector(login) forControlEvents:UIControlEventTouchUpInside];
    //用在controller层
    
    _registeBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    _registeBtn.frame = CGRectMake(233, 480, 80, 40);
    _registeBtn.layer.cornerRadius = _registeBtn.frame.size.height / 6.0;
    _registeBtn.layer.masksToBounds = YES;
    _registeBtn.layer.borderWidth = 2.0;
    _registeBtn.layer.borderColor = [UIColor whiteColor].CGColor;
    [_registeBtn setTitle:@"注册" forState:UIControlStateNormal];
    _registeBtn.tintColor = [UIColor blackColor];
    _registeBtn.titleLabel.font = [UIFont systemFontOfSize:20];
    _registeBtn.layer.borderColor = [UIColor blackColor].CGColor;  // 设置边框颜色
    [self addSubview:self.registeBtn];

    //添加注册时间
    
//    [_registeBtn addTarget:self action:@selector(registe) forControlEvents:UIControlEventTouchUpInside];
    
}

Controller：

//
//  ViewController.h
//  MVC学习
//
//  Created by 夏楠 on 2023/9/9.
//

#import <UIKit/UIKit.h>
#import "RegistViewController.h"
#import "LandModel.h"
#import "LandView.h"

@interface ViewController : UIViewController<UITextFieldDelegate, ConfirmDelegate>
@property (nonatomic, strong)LandView *landView;
@property (nonatomic, strong)LandModel *landModel;
@property (retain, nonatomic)UIAlertController *alert;
@property (nonatomic, strong)RegistViewController *rVC;

@end

//
//  ViewController.m
//  MVC学习
//
//  Created by 夏楠 on 2023/9/9.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    _landModel = [[LandModel alloc] init];
    [_landModel InitLandModel];
    
    _landView = [[LandView alloc] initWithFrame:self.view.frame];
    [_landView InitView];
    [self.view addSubview:_landView];
    
    [_landView.loginBtn addTarget:self action:@selector(login) forControlEvents:UIControlEventTouchUpInside];
    [_landView.registeBtn addTarget:self action:@selector(registe) forControlEvents:UIControlEventTouchUpInside];
}

登陆函数
- (void)login {

    int boo1 = 0;
    for (int i = 0; i < _landModel.accoutArray.count; i ++) {
        if ([_landModel.accoutArray[i] isEqualToString:_landView.textField1.text] && [_landModel.passwordArray[i] isEqualToString:_landView.textField2.text]) {
            boo1 = 1;
            break;
        }
    }

        if (boo1 == 1) {
            self.alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"登陆成功" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

            }];
            [self.alert addAction:confirmAction];
            [self presentViewController:self.alert animated:YES completion:nil];
        } else {
            self.alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"用户名或密码错误" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            }];
            [self.alert addAction:confirmAction];
            [self presentViewController:self.alert animated:YES completion:nil];
        }
    }

- (void)registe {
    if (!_rVC)
    _rVC = [[RegistViewController alloc] init];
    _rVC.delegate = self;
    NSLog(@"%@, %@", _landModel.accoutArray, _landModel.passwordArray);
    [self presentViewController:_rVC animated:YES completion:nil];
}

- (void)confirm:(NSMutableArray *)account password:(NSMutableArray *)password {
    _landModel.accoutArray = [NSMutableArray arrayWithArray:account];
    _landModel.passwordArray = [NSMutableArray arrayWithArray:password];
}


@end

运行动画：

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