[ios] 使用iOS手势UIGestureRecognizer

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本文介绍了UIKit中用于处理手势识别的UIGestureRecognizer类及其子类，包括如何配置手势识别器以实现特定的手势，如单指双击、两指双击、上下滑动、旋转等，并展示了相应的代码示例。

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转自：http://www.oschina.net/code/snippet_54100_8106

UIKit中包含了UIGestureRecognizer类，用于检测发生在设备中的手势。UIGestureRecognizer是一个抽象类，定义了所有手势的基本行为，它有下面一些子类用于处理具体的手势：

    1、拍击UITapGestureRecognizer (任意次数的拍击)
    2、向里或向外捏UIPinchGestureRecognizer (用于缩放)
    3、摇动或者拖拽UIPanGestureRecognizer
    4、擦碰UISwipeGestureRecognizer (以任意方向)
    5、旋转UIRotationGestureRecognizer (手指朝相反方向移动)
    6、长按UILongPressGestureRecognizer

对于不同类型的手势识别器，具有不同的配置属性。比如UITapGestureRecognizer，可以配置拍击次数。界面接收到手势之后，可以发送一个消息，用于处理响应手势动作后的任务。当然，不同的手势识别器，发送的消息方法也会有所不同。下面列举几个具体示例代码：
http://www.ctolive.com/space-1023-do-blog-id-2107.html

标签： Objective-C iOS

代码片段(5)

[代码] 一个手指，拍击两次手势

 
       01// 创建一个手势识别器

       02UITapGestureRecognizer *oneFingerTwoTaps =

       03   [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease]; 

       04   

       05// Set required taps and number of touches

       06[oneFingerTwoTaps setNumberOfTapsRequired:2];

       07[oneFingerTwoTaps setNumberOfTouchesRequired:1];

       08   

       09// Add the gesture to the view

       10[[self view] addGestureRecognizer:oneFingerTwoTaps];

       11 

       12消息方法oneFingerTwoTaps

       13 - (void)oneFingerTwoTaps 

       14{

       15   NSLog(@"Action: One finger, two taps"); 

       16}

[代码] 两个手指，拍击两次手势

 
       01UITapGestureRecognizer *twoFingersTwoTaps =

       02   [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersTwoTaps)] autorelease]; 

       03[twoFingersTwoTaps setNumberOfTapsRequired:2];

       04[twoFingersTwoTaps setNumberOfTouchesRequired:2];

       05[[self view] addGestureRecognizer:twoFingersTwoTaps];

       06 

       07消息方法twoFingersTwoTaps

       08 - (void)twoFingersTwoTaps { 

       09   NSLog(@"Action: Two fingers, two taps"); 

       10}

[代码] 一个手指向上、向下擦碰手势

 
       01// 向上擦碰

       02UISwipeGestureRecognizer *oneFingerSwipeUp =

       03   [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeUp:)] autorelease]; 

       04[oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp];

       05[[self view] addGestureRecognizer:oneFingerSwipeUp];

       06 

       07 - (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer 

       08{

       09   CGPoint point = [recognizer locationInView:[self view]]; 

       10   NSLog(@"Swipe up - start location: %f,%f", point.x, point.y); 

       11}

       12 

       13// 向下擦碰

       14UISwipeGestureRecognizer *oneFingerSwipeDown =

       15   [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeDown:)] autorelease]; 

       16[oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown];

       17[[self view] addGestureRecognizer:oneFingerSwipeDown];

       18 

       19 - (void)oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer 

       20{

       21   CGPoint point = [recognizer locationInView:[self view]]; 

       22   NSLog(@"Swipe down - start location: %f,%f", point.x, point.y); 

       23}

[代码] 旋转手势

 
       1UIRotationGestureRecognizer *twoFingersRotate =

       2   [[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)] autorelease]; 

       3[[self view] addGestureRecognizer:twoFingersRotate];

       4 

       5 - (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer 

       6{

       7   // Convert the radian value to show the degree of rotation 

       8   NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI)); 

       9}

[代码] 向里或向外捏的手势

 
       1UIPinchGestureRecognizer *twoFingerPinch =

       2   [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease]; 

       3[[self view] addGestureRecognizer:twoFingerPinch];

       4 

       5 - (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer 

       6{

       7   NSLog(@"Pinch scale: %f", recognizer.scale); 

       8}