iOS开发

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
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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];}
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//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];//    }}