文章目录
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
Model：
objectivec
//
// 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
objectivec
//
// 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];
}
@endView：
objectivec
//
// 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
objectivec
//
// 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：
objectivec
//
// 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
objectivec
//
// 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：
