事件響應鏈

事件響應鏈

（1）設置根視圖控制器

（2）RootViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];

    MyView *view = [[MyView alloc] initWithFrame:CGRectMake(0, 20, 320, 300)];
    view.backgroundColor = [UIColor grayColor];
    [self.view addSubview:view];
    
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    NSLog(@"viewCtrl touchesBegan");
    
    [self.nextResponder touchesBegan:touches withEvent:event];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    NSLog(@"myView touchesBegan");
    
    //將事件傳遞給下一個響應者
    /*
     nextResponder可以取得下一個響應者
     */
    [self.nextResponder touchesBegan:touches withEvent:event];
}

//window分發事件的方法
- (void)sendEvent:(UIEvent *)event {

    NSLog(@"window sendEvent");
    
    [super sendEvent:event];
    
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    NSLog(@"window touchesBegan");
    
}