Cocos2d中添加手勢支持的三種方法

最近一直琢磨在Cocos2d裡添加手勢的功能，找了一些資料加上自己的理解，整理出了三種方法和大家分享。

第一種，很簡單，就是知易cocos2d-iPhone教程-04所介紹的（其實這並不是真正的手勢，只是也能實現部分手勢功能而已），代碼如下：

1） 單擊、雙擊處理

1. - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
2. {
3. //Get all the touches.
4. NSSet *allTouches = [event allTouches];
5. //Number of touches on the screen
6. switch ([allTouches count])
7. {
8. case 1:
9. {
10. //Get the first touch.
11. UITouch *touch = [[allTouches allObjects] objectAtIndex:0];
12. switch([touch tapCount])
13. {
14. case 1://Single tap
15. // 單擊！！
16. break;
17. case 2://Double tap.
18. // 雙擊！！
19. break; }
20. }
21. break;
22. }
23. }
24. }

2） 兩個指頭的分開、合攏手勢。

1. //計算兩個點之間的距離函數
2. - (CGFloat)distanceBetweenTwoPoints:(CGPoint)fromPoint toPoint:(CGPoint)toPoint
3. {
4. float x = toPoint.x - fromPoint.x;
5. float y = toPoint.y - fromPoint.y;
6. return sqrt(x * x + y * y);
7. }
9. //記錄多觸點之間的初始距離
10. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
11. {
12. NSSet *allTouches = [event allTouches];
13. switch ([allTouches count])
14. {
15. case 1: { //Single touch
16. break;}
17. case 2: { //Double Touch
18. //Track the initial distance between two fingers.
19. UITouch *touch1 = [[allTouches allObjects] objectAtIndex:0];
20. UITouch *touch2 = [[allTouches allObjects] objectAtIndex:1];
21. initialDistance = [self distanceBetweenTwoPoints:[touch1 locationInView:[self view]] toPoint:[touch2 locationInView:[self view]]];
22. }
23. break;
24. default:
25. break;
26. }
27. }
29. //兩個指頭移劢時，判斷是分開還是合攏
30. - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
31. {
32. NSSet *allTouches = [event allTouches];
33. switch ([allTouches count])
34. {
35. case 1:
36. break;
37. case 2:{
38. UITouch *touch1 = [[allTouches allObjects] objectAtIndex:0];
39. UITouch *touch2 = [[allTouches allObjects] objectAtIndex:1];
40. //Calculate the distance between the two fingers.
41. CGFloat finalDistance = [self distanceBetweenTwoPoints: [touch1 locationInView:[self view]] toPoint:[touch2 locationInView:[self view]]];
42. //Check if zoom in or zoom out.
43. if(initialDistance > finalDistance) {
44. NSLog(@"Zoom Out"); // 合攏！！
45. }
46. else {
47. NSLog(@"Zoom In"); // 分開！！
48. }
49. }
50. break;
51. }
52. }