为UIView添加上下左右滑动操作

为UIView添加上下左右滑动操作

  (2011-03-16 14:00:39)
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iphone

 

it

 

objective-c

 

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分类: iPhone
方法一: 
在viewDidLoad时为UIView添加操作 

  1. UISwipeGestureRecognizer *recognizer;  
  2. recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];  
  3. [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];  
  4. [[self view] addGestureRecognizer:recognizer];  
  5. [recognizer release];  
  6.   
  7. recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];  
  8. [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];  
  9. [[self view] addGestureRecognizer:recognizer];  
  10. [recognizer release];  
  11.   
  12. recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];  
  13. [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)];  
  14. [[self view] addGestureRecognizer:recognizer];  
  15. [recognizer release];  
  16.   
  17. recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];  
  18. [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)];  
  19. [[self view] addGestureRecognizer:recognizer];  
  20. [recognizer release];  

响应操作绑定的事件 

  1. - (void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer{  
  2.         //UISwipeGestureRecognizerDirectionLeft   UISwipeGestureRecognizerDirectionRight  UISwipeGestureRecognizerDirectionUp  UISwipeGestureRecognizerDirectionDown  
  3.     if (recognizer.direction==UISwipeGestureRecognizerDirectionLeft ) {  
  4.         NSLog(@"Left");   
  5.     }  
  6.       
  7. }  

方法二: 

  1. #define HORIZ_SWIPE_DRAG_MIN 12  
  2. #define VERT_SWIPE_DRAG_MAX 4  
  3. CGPoint startTouchPosition;  
  4. NSString *dirString ;  
  5.   
  6. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{  
  7.     UITouch *touch = touches.anyObject;  
  8.     startTouchPosition = [touch locationInView:self.view];  
  9. }  
  10.   
  11. - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event      
  12. {      
  13.     UITouch *touch = touches.anyObject;      
  14.     CGPoint currentTouchPosition = [touch locationInView:self.view];  
  15.     if (fabsf(startTouchPosition.x - currentTouchPosition.x) >=      
  16.         HORIZ_SWIPE_DRAG_MIN &&      
  17.         fabsf(startTouchPosition.y - currentTouchPosition.y) <=      
  18.         VERT_SWIPE_DRAG_MAX)      
  19.     {      
  20.         // Horizontal Swipe     
  21.         if (startTouchPosition.x < currentTouchPosition.x) {     
  22.             NSLog(@"from left");     
  23.             dirString = @"left";  
  24.         }     
  25.         else{      
  26.             NSLog(@"from right");     
  27.             dirString = @"right";}  
  28.         }      
  29.    else if (fabsf(startTouchPosition.y - currentTouchPosition.y) >=      
  30.              HORIZ_SWIPE_DRAG_MIN &&      
  31.              fabsf(startTouchPosition.x - currentTouchPosition.x) <=      
  32.              VERT_SWIPE_DRAG_MAX)     
  33.     {      
  34.         // Vertical Swipe     
  35.         if (startTouchPosition.y < currentTouchPosition.y) {     
  36.             NSLog(@"from bottom");  
  37.             dirString = @"bottom";}  
  38.         else    {  
  39.             NSLog(@"from top");  
  40.             dirString = @"top";}  
  41.     } else      
  42.     {     
  43.         //dirString = @"";  
  44.     }     
  45. }   
  46.   
  47. - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{  
  48.     if (dirString == @"right") {  
  49.         NSLog(@"event right");  
  50.     }else if (dirString == @"left") {  
  51.         NSLog(@"event left");  
  52.     }  
  53. }  

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