UITapGestureRecognizer点击手势区分单双击

- (void)viewDidLoad {
    // 单击的 Recognizer
    UITapGestureRecognizer* singleRecognizer;
    singleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSingleTapFrom)];
    singleTapRecognizer.numberOfTapsRequired = 1; // 单击
    [self.view addGestureRecognizer:singleRecognizer];
    
    // 双击的 Recognizer
    UITapGestureRecognizer* double;
    doubleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleDoubleTapFrom)];
    doubleTapRecognizer.numberOfTapsRequired = 2; // 双击
    [self.view addGestureRecognizer:doubleRecognizer];
    
    // 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];
}