iOS 下上左右手势识别

iOS 上下左右手势识别

1. - (void)viewDidLoad {  
2. //建立滑动手势
3.     UISwipeGestureRecognizer *recognizer;   
4.     recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSwipeFrom:)];   
5. //设置滑动方向，下面以此类推
6.     [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];   
7.     [[self view] addGestureRecognizer:recognizer];   
8.     [recognizer release];  
9. 
   
10.      recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSwipeFrom:)];   
11.     [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)];   
12.     [[self view] addGestureRecognizer:recognizer];   
13.     [recognizer release];   
14.       
15.     recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSwipeFrom:)];   
16.     [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)];  
17.     [[self view] addGestureRecognizer:recognizer];   
18.     [recognizer release];   
19.       
20.     recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSwipeFrom:)];   
21.     [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];   
22.     [[self view] addGestureRecognizer:recognizer];   
23.     [recognizer release];  
24.   
25.     [super viewDidLoad];  
26.  }  
27.   
28. //这个是协议回调，所以需要遵循 UIGestureRecognizerDelegate协议
29. -(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {   
30.      NSLog(@"Swipe received.");   
31.      if (recognizer.direction==UISwipeGestureRecognizerDirectionDown) {   
32.                 NSLog(@"向下滑动");  
33.     //执行程序  
34.      }  
35.      if (recognizer.direction==UISwipeGestureRecognizerDirectionUp) {   
36.     NSLog(@"向上滑动");  
37.     //执行程序  
38.      }  
39.      if (recognizer.direction==UISwipeGestureRecognizerDirectionLeft) {   
40.     NSLog(@"向左滑动");  
41.     //执行程序  
42.      }  
43.      if (recognizer.direction==UISwipeGestureRecognizerDirectionRight) {   
44.     NSLog(@"向右滑动");  
45.     //执行程序  
46.      }  
47. }