使用iOS手勢UIGestureRecognizer

UIKit中包含了UIGestureRecognizer類，用於檢測發生在裝置中的手勢。UIGestureRecognizer是一個抽象類別，定義了所有手勢的基本行為，它有下面一些子類用於處理具體的手勢：  　　1、拍擊UITapGestureRecognizer (任意次數的拍擊)   　　2、向裡或向外捏UIPinchGestureRecognizer (用於縮放)   　　3、搖動或者拖拽UIPanGestureRecognizer   　　4、擦碰UISwipeGestureRecognizer (以任意方向)   　　5、旋轉UIRotationGestureRecognizer (手指朝相反方向移動)   　　6、長按UILongPressGestureRecognizer   對於不同類型的手勢辨識器，具有不同的配置屬性。比如UITapGestureRecognizer，可以配置拍擊次數。介面接收到手勢之後，可以發送一個訊息，用於處理響應手勢動作後的任務。當然，不同的手勢辨識器，發送的訊息方法也會有所不同。下面列舉幾個具體範例程式碼：   一個手指，拍擊兩次手勢  // 建立一個手勢辨識器  UITapGestureRecognizer *oneFingerTwoTaps =    [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease];  // Set required taps and number of touches  [oneFingerTwoTaps setNumberOfTapsRequired:2];  [oneFingerTwoTaps setNumberOfTouchesRequired:1];  // Add the gesture to the view  [[self view] addGestureRecognizer:oneFingerTwoTaps];  訊息方法oneFingerTwoTaps  - (void)oneFingerTwoTaps  {    NSLog(@"Action: One finger, two taps");  }  兩個手指，拍擊兩次手勢      UITapGestureRecognizer *twoFingersTwoTaps =        [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersTwoTaps)] autorelease];      [twoFingersTwoTaps setNumberOfTapsRequired:2];      [twoFingersTwoTaps setNumberOfTouchesRequired:2];      [[self view] addGestureRecognizer:twoFingersTwoTaps];  訊息方法twoFingersTwoTaps      - (void)twoFingersTwoTaps {        NSLog(@"Action: Two fingers, two taps");      }   一個手指向上、向下擦碰手勢  // 向上擦碰      UISwipeGestureRecognizer *oneFingerSwipeUp =        [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeUp:)] autorelease];      [oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp];      [[self view] addGestureRecognizer:oneFingerSwipeUp];             - (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer      {        CGPoint point = [recognizer locationInView:[self view]];        NSLog(@"Swipe up - start location: %f,%f", point.x, point.y);      }      // 向下擦碰      UISwipeGestureRecognizer *oneFingerSwipeDown =        [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeDown:)] autorelease];      [oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown];      [[self view] addGestureRecognizer:oneFingerSwipeDown];             - (void)oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer      {        CGPoint point = [recognizer locationInView:[self view]];        NSLog(@"Swipe down - start location: %f,%f", point.x, point.y);      }  旋轉手勢  UIRotationGestureRecognizer *twoFingersRotate =    [[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)] autorelease];  [[self view] addGestureRecognizer:twoFingersRotate];    - (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer  {    // Convert the radian value to show the degree of rotation    NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));  }  向裡或向外捏的手勢  UIPinchGestureRecognizer *twoFingerPinch =    [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease];  [[self view] addGestureRecognizer:twoFingerPinch];    - (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer  {    NSLog(@"Pinch scale: %f", recognizer.scale);  } 論壇原帖地址：http://www.cocoachina.com/bbs/read.php?tid=105316