如果一張既要單擊手勢， 又要雙擊手勢，要怎麼處理，看完這句**你就知道了
uitapgesturerecognizer*doublerecognizer = [[uitapgesturerecognizeralloc]initwithtarget:selfaction:@selector(handledoubletapgesture:)];
doublerecognizer.numberoftapsrequired=2;
[_containerviewaddgesturerecognizer:doublerecognizer];
uitapgesturerecognizer*singlerecognizer = [[uitapgesturerecognizeralloc]initwithtarget:selfaction:@selector(handletapgesture:)];
[_containerviewaddgesturerecognizer:singlerecognizer];
[singlerecognizerrequiregesturerecognizertofail:doublerecognizer];
單擊事件的執行依賴於雙擊事件失敗的基礎上，如果不加這句依賴關係，雙擊兩次的時候，只會執行兩次單擊事件，永遠不會執行雙擊事件。這個依賴關係只適用於同乙個控制器，若是在不同的控制器，可使用下面的**設定優先順序
- (bool)gesturerecognizer:(uigesturerecognizer*)gesturerecognizer shouldrequirefailureofgesturerecognizer:(uigesturerecognizer*)othergesturerecognizer
- (bool)gesturerecognizer:(uigesturerecognizer*)gesturerecognizer shouldberequiredtofailbygesturerecognizer:(uigesturerecognizer*)othergesturerecognizer
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