IOS开发之手势——UIGestureRecognizer 共存

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// 定义一个 recognizer,并加到需要偵測该手势的 UIView 元件上
- (void)viewDidLoad {
    UISwipeGestureRecognizer* recognizer;
 handleSwipeFrom 是偵測到手势，所要呼叫的方法
    recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@SELEctor(handleSwipeFrom)];
 不同的 Recognizer 有不同的实体变数
 例如 SwipeGesture 可以指定方向
 而 TapGesture 則可以指定次數
    recognizer.direction = UISwipeGestureRecognizerDirectionUp
    [self.view addGestureRecognizer:recognizer];
    [recognizer release];
 }

 - (void)handleSwipeFrom:(UISwipeGestureRecognizer*)recognizer {
 触发手勢事件后，在这里作些事情

 底下是刪除手势的方法
    [self.view removeGestureRecognizer:recognizer];
 }

- (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];}