手勢

1、手勢種類

• UITapGestureRecognizer  點擊
• UIPinchGestureRecognizer 二指往內或往外撥動
• UIRotationGestureRecognizer 旋轉
• UISwipeGestureRecognizer 滑動，快速移動
• UIPanGestureRecognizer 拖移，慢速移動
• UILongPressGestureRecognizer 長按

2、事件

   一、單擊

   UITapGestureRecognizer* singleRecognizer;

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

    singleTapRecognizer.numberOfTapsRequired = 1; // 單擊

    [self.view addGestureRecognizer:singleRecognizer];

  二、雙擊

    // 雙擊的 Recognizer

    UITapGestureRecognizer* double;

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

    doubleTapRecognizer.numberOfTapsRequired = 2; // 雙擊

    [self.view addGestureRecognizer:doubleRecognizer];

 

    // 關鍵在這一行，若是雙擊肯定偵測失敗才會觸發單擊

    [singleRecognizer requireGestureRecognizerToFail:doubleRecognizer];

 

三、二指往內或往外撥動

UIPinchGestureRecognizer *twoFingerPinch =[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)];
[self.view addGestureRecognizer:twoFingerPinch];

- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
{
  NSLog(@"Pinch scale: %f", recognizer.scale);

}

 四、旋轉

   UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
    [rotationRecognizer setDelegate:self];
    [self.view addGestureRecognizer:rotationRecognizer];