为UIView添加上下左右滑动操作

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. }