[ios] 使用iOS手势UIGestureRecognizer

老是忘记 mark以下

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 
        
         02 
         UITapGestureRecognizer *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

 
         01 
         UITapGestureRecognizer *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 
        
         02 
         UISwipeGestureRecognizer *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 
        
         14 
         UISwipeGestureRecognizer *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

 
         1 
         UIRotationGestureRecognizer *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

 
         1 
         UIPinchGestureRecognizer *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 
         }