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];
8. // 縮放手勢
9. UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];
10. [view addGestureRecognizer:pinchGestureRecognizer];
12. // 移動手勢
13. UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];
14. [view addGestureRecognizer:panGestureRecognizer];
15. }
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. }
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. }
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. }

這樣只需要簡單調用

1. [self addGestureRecognizerToView:view];
3. //如果處理的是圖片，別忘了
4. [imageView setUserInteractionEnabled:YES];
5. [imageView setMultipleTouchEnabled:YES];

大功告成。

具體使用一下：

在.h文件裏邊定義變量

1. @interface YourViewController : UIViewController<UIGestureRecognizerDelegate>
2. {
3. CGFloat lastScale;
4. CGRect oldFrame; //保存圖片原來的大小
5. CGRect largeFrame; //確定圖片放大最大的程度
6. }

然後在viewDidLoad裏面加上

1. - (void)viewDidLoad
2. {
3. [super viewDidLoad];
5. showImgView = [[UIImageView alloc] initWithFrame:<span class="s1">CGRectMake</span>(<span class="s2">0</span>, <span class="s2">0</span>, 320, 480)];
6. [showImgView setMultipleTouchEnabled:YES];
7. [showImgView setUserInteractionEnabled:YES];
8. [showImgView setImage:[UIImage imageNamed:@"1.jpg"]];
10. oldFrame = showImgView.frame;
11. largeFrame = CGRectMake(0 - screenSize.width, 0 - screenSize.height, 3 * oldFrame.size.width, 3 * oldFrame.size.height);
13. [self addGestureRecognizerToView:showImgView];
14. [self.view addSubview:showImgView];

這樣就實現了

但是，這樣是不夠的。

因為裏邊的縮放和移動等沒有做相應的判斷。

因為代碼很簡潔，所以擴展也非常方便。

修改了縮放的代碼，增加了限制，其他的類似

1. // 處理縮放手勢
2. - (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer
3. {
4. UIView *view = pinchGestureRecognizer.view;
5. if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged) {
6. view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale);
7. if (showImgView.frame.size.width < oldFrame.size.width) {
8. showImgView.frame = oldFrame;
9. //讓圖片無法縮得比原圖小
10. }
11. if (showImgView.frame.size.width > 3 * oldFrame.size.width) {
12. showImgView.frame = largeFrame;
13. }
14. pinchGestureRecognizer.scale = 1;
15. }
16. }

這樣就好了。保證了圖片的最大和最小比例。

參考文章： http://apluck.iteye.com/blog/1781607

使用手勢對UIImageView進行縮放、旋轉和移動