事件响应链

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（1）设置根视图控制器

（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];}

（3）MyView.m

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {    NSLog(@"myView touchesBegan");        //将事件传递给下一个响应者    /*     nextResponder可以取得下一个响应者     */    [self.nextResponder touchesBegan:touches withEvent:event];}

（4）TouchWindow.m

//window分发事件的方法- (void)sendEvent:(UIEvent *)event {    NSLog(@"window sendEvent");        [super sendEvent:event];    }- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {    NSLog(@"window touchesBegan");    }

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