-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
此方法用到的频率还是很高的，但是有一种情况，如下图：
同时有白色蓝色两个视图，蓝色为白色视图的子视图，两个视图都有各自点击的事件，怎么来判断我点击的是哪个，你可以使用Tap的手势来写，通过tap.view.tag来区分是哪个view，还有一种办法就是利用touch方法来解决，实现的效果如下：
来看看代码是怎么写的：
//给出两个view，不多解释了 - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.view.backgroundColor=[UIColor grayColor]; whiteView=[[UIView alloc]initWithFrame:CGRectMake(100, 100, 200, 200)]; whiteView.center=self.view.center; whiteView.backgroundColor=[UIColor whiteColor]; [self.view addSubview:whiteView]; blueLayer=[CALayer layer]; blueLayer.frame=CGRectMake(50, 50, 100, 100); blueLayer.backgroundColor=[UIColor blueColor].CGColor; [whiteView.layer addSublayer:blueLayer]; }
//touch的响应方法 -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { CGPoint point = [[touches anyObject] locationInView:self.view]; //convert point to the white layer's coordinates拿到在self.view上但同时在whiteView上的点，下面的同这里一样，不一一解释了 point = [whiteView.layer convertPoint:point fromLayer:self.view.layer]; //get layer using containsPoint: if ([whiteView.layer containsPoint:point]) { //convert point to blueLayer’s coordinates point = [blueLayer convertPoint:point fromLayer:whiteView.layer]; if ([blueLayer containsPoint:point]) { [[[UIAlertView alloc] initWithTitle:@"Inside Blue Layer" message:nil delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show]; } else { [[[UIAlertView alloc] initWithTitle:@"Inside White Layer" message:nil delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]show]; } } //－－－－－－－－－－华丽丽的分割线，从这里开始是我写的点击的方法，相对来说比上面使用起来更方便点 // CGPoint point=[[touches anyObject]locationInView:self.view]; // CALayer *layer=[whiteView.layer hitTest:point]; // if (layer==whiteView.layer) { // UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"" message:@"Inside white layer" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; // [alertView show]; // } // else if (layer==blueLayer){ // UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"" message:@"Inside blue layer" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; // [alertView show]; // } }
