ios開發--旋轉、移動、縮放手勢執行個體代碼

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1. // 添加所有的手勢  
2. - (void) addGestureRecognizerToView:(UIView *)view  
3. {  
4.     // 旋轉手勢  
5.     UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)];  
6.     [view addGestureRecognizer:rotationGestureRecognizer];  
7.       
8.     // 縮放手勢  
9.     UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];  
10.     [view addGestureRecognizer:pinchGestureRecognizer];  
11.       
12.     // 移動手勢  
13.     UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];  
14.     [view addGestureRecognizer:panGestureRecognizer];  
15. }  
16.   
17. // 處理旋轉手勢  
18. - (void) rotateView:(UIRotationGestureRecognizer *)rotationGestureRecognizer  
19. {  
20.     UIView *view = rotationGestureRecognizer.view;  
21.     if (rotationGestureRecognizer.state == UIGestureRecognizerStateBegan || rotationGestureRecognizer.state == UIGestureRecognizerStateChanged) {  
22.         view.transform = CGAffineTransformRotate(view.transform, rotationGestureRecognizer.rotation);  
23.         [rotationGestureRecognizer setRotation:0];  
24.     }  
25. }  
26.   
27. // 處理縮放手勢  
28. - (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer  
29. {  
30.     UIView *view = pinchGestureRecognizer.view;  
31.     if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged) {  
32.         view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale);  
33.         pinchGestureRecognizer.scale = 1;  
34.     }  
35. }  
36.   
37. // 處理拖拉手勢  
38. - (void) panView:(UIPanGestureRecognizer *)panGestureRecognizer  
39. {  
40.     UIView *view = panGestureRecognizer.view;  
41.     if (panGestureRecognizer.state == UIGestureRecognizerStateBegan || panGestureRecognizer.state == UIGestureRecognizerStateChanged) {  
42.         CGPoint translation = [panGestureRecognizer translationInView:view.superview];  
43.         [view setCenter:(CGPoint){view.center.x + translation.x, view.center.y + translation.y}];  
44.         [panGestureRecognizer setTranslation:CGPointZero inView:view.superview];  
45.     }  
46. }