解决手势共存

UIGestureRecognizer 有个方法叫做requireGestureRecognizerToFail，他可以指定某一个recognizer，即便自己已经滿足條件了，也不會立刻触发，会等到该指定的 recognizer确定失败之后才触发。以同时支持单点与双点的手势为例，代码如下：

- (void)viewDidLoad {

 // 双击的 Recognizer

    UITapGestureRecognizer* double;

    doubleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleDoubleTapFrom)];

    doubleTapRecognizer.numberOfTapsRequired = 2; //双击

    [self.view addGestureRecognizer:doubleRecognizer];

    //单击的 Recognizer

    UITapGestureRecognizer* singleRecognizer;

    singleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSingleTapFrom)];

    singleTapRecognizer.numberOfTapsRequired = 1; //单击

    [self.view addGestureRecognizer:singleRecognizer];

    

  

    

    //关键在这一行，如果双击确定偵測失败才會触发单击

    [singleRecognizer requireGestureRecognizerToFail:doubleRecognizer];

    [singleRecognizer release];

    [doubleRecognizer release];

}