ios开发--旋转、移动、缩放手势实例代码

代码如下：

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

别忘了

1. [self addGestureRecognizerToView:view];

如果处理的是图片，别忘了

1. [imageView setUserInteractionEnabled:YES];
2. [imageView setMultipleTouchEnabled:YES];