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];
15. recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSwipeFrom:)];
16. [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)];
17. [[self view] addGestureRecognizer:recognizer];
18. [recognizer release];
20. recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSwipeFrom:)];
21. [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
22. [[self view] addGestureRecognizer:recognizer];
23. [recognizer release];
25. [super viewDidLoad];
26. }
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. }