UIKit中包含了UIGestureRecognizer類，用于檢測發生在設備中的手勢。UIGestureRecognizer是一個抽象類，定義了所有手勢的基本行為，它有下面一些子類用于處理具體的手勢：?

??? 1、拍擊UITapGestureRecognizer (任意次數的拍擊)??
??? 2、向里或向外捏UIPinchGestureRecognizer (用于縮放)??
??? 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?

對于不同類型的手勢識別器，具有不同的配置屬性。比如UITapGestureRecognizer，可以配置拍擊次數。界面接收到手勢之后，可以發送一個消息，用于處理響應手勢動作后的任務。當然，不同的手勢識別器，發送的消息方法也會有所不同。下面列舉幾個具體示例代碼：?

一個手指，拍擊兩次手勢

// 創建一個手勢識別器 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];

消息方法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];

消息方法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 rotationNSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI)); }

向里或向外捏的手勢

UIPinchGestureRecognizer *twoFingerPinch =[[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease]; [[self view] addGestureRecognizer:twoFingerPinch];- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer {NSLog(@"Pinch scale: %f", recognizer.scale); }

?

轉載于:https://www.cnblogs.com/goodleixiao/archive/2012/06/04/2534443.html

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