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  • 源码03-02-07-LoadView

    //
    //  AppDelegate.m
    //  07-控制器View的创建
    #import "AppDelegate.h"
    
    @interface AppDelegate ()
    
    @end
    
    @implementation AppDelegate
    
    
    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
        // Override point for customization after application launch.
        
        
        self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
        
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
        
        // 加载箭头指向的控制器
        UIViewController *vc = [storyboard instantiateInitialViewController];
        
        
        self.window.rootViewController = vc;
        
        [self.window makeKeyAndVisible];
        
        return YES;
    }
    @end
    //
    //  ViewController.m
    //  07-控制器View的创建
    #import "ViewController.h"
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    
    // loadView作用:自定义控制器的view
    
    // loadView什么时候调用:第一次使用控制器的view的时候调用
    
    // 注意:在这个方法中如果没有自定义view,就不能获取控制器的view
    
    // 一旦重写了这个方法,就不要调用[super loadView]
    // 如果重写了这个方法,就不会去加载storyboard描述的控制器的View
    - (void)loadView
    {
      //  self.view.backgroundColor = [UIColor redColor];
        
    //    // 创建控制器view
        self.view = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    //    
        self.view.backgroundColor = [UIColor purpleColor];
    }
    
    //- (UIView *)view
    //{
    //    if (_view == nil) {
    //        [self loadView];
    //        
    //        [self viewDidLoad];
    //    }
    //    return _view;
    //}
    
    
    #pragma mark - 直接不实现就是系统默认的做法
    //- (void)loadView
    //{
    //    // super ->  UIViewController
    //    // 系统默认的做法,一定不要这样写
    //    [super loadView];
    //    
    //}
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        // Do any additional setup after loading the view, typically from a nib.
    }
    
    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end

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  • 原文地址:https://www.cnblogs.com/laugh/p/6549794.html
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