iOS MVC设计模式详解

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1.概念

       M: model 模型层: 负责保存数据,继承自NSObject

       Vview视图层:负责向用户展示数据, 继承自UIVIew

       Ccontroller控制器层: 负责将model层的数据传递到view层, 继承UIViewController

2. 职责

      Model层:负责定义Model的属性

      View层:需要持有Model层的引用,在视图初始化的时候添加所有子视图,并重写model属性的setter方法来为子视图填充数据

      Controller: 需要获取Model数据,并初始化View,然后将Model赋值给View的model引用, 最后将View添加到self.view上


      MVC框架的目的是,尽可能的降低代码的耦合度(低耦合),使的每个类个职责单一化(单一职责),以便更容易的维护.


3.示例代码

        1.Model层

#import <Foundation/Foundation.h>@interface User : NSObject@property (copy, nonatomic) NSString *name;@property (copy, nonatomic) NSString *password;@end#import "User.h"@implementation User@end

      2.View层

#import <UIKit/UIKit.h>#import "User.h"@interface UserView : UIView@property (strong, nonatomic) User *user;@end#import "UserView.h"@interface UserView () {    UILabel *nameLabel;    UILabel *passwordLabel;}@end@implementation UserView// 初始化子视图- (instancetype)initWithFrame:(CGRect)frame {    if (self = [super initWithFrame:frame]) {        nameLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 100, 200, 50)];        nameLabel.backgroundColor = [UIColor darkGrayColor];        nameLabel.textColor = [UIColor whiteColor];        [self addSubview:nameLabel];                passwordLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 300, 200, 50)];        passwordLabel.backgroundColor = [UIColor darkGrayColor];        passwordLabel.textColor = [UIColor whiteColor];        [self addSubview:passwordLabel];    }        return self;}// 为子视图填充数据- (void)setUser:(User *)user {    _user = user;        // 视图层展示的Label数据是从Model中获取的    nameLabel.text = _user.name;    passwordLabel.text = _user.password;}@end

       3.Controller层

#import "User.h"#import "UserView.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        // 1. 模拟从网络或其他位置获取数据    User *userModel = [[User alloc] init];    userModel.name = @"xiaohong";    userModel.password = @"123456";        // 2. 将获取的数据加载到View之上,交给View处理    CGSize screenSize = [UIScreen mainScreen].bounds.size;    UserView *userView = [[UserView alloc] initWithFrame:CGRectMake(0, 0, screenSize.width, screenSize.height)];    userView.user = userModel;    [self.view addSubview:userView];}@end

4. 执行结果截图





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