// 添加所有的手势
- (void) addGestureRecognizerToView:(UIView *)view
{// 旋转手势UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)];[view addGestureRecognizer:rotationGestureRecognizer];// 缩放手势UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];[view addGestureRecognizer:pinchGestureRecognizer];// 移动手势UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];[view addGestureRecognizer:panGestureRecognizer];
}// 处理旋转手势
- (void) rotateView:(UIRotationGestureRecognizer *)rotationGestureRecognizer
{UIView *view = rotationGestureRecognizer.view;if (rotationGestureRecognizer.state == UIGestureRecognizerStateBegan || rotationGestureRecognizer.state == UIGestureRecognizerStateChanged) {view.transform = CGAffineTransformRotate(view.transform, rotationGestureRecognizer.rotation);[rotationGestureRecognizer setRotation:0];}
}// 处理缩放手势
- (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer
{UIView *view = pinchGestureRecognizer.view;if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged) {view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale);pinchGestureRecognizer.scale = 1;}
}// 处理拖拉手势
- (void) panView:(UIPanGestureRecognizer *)panGestureRecognizer
{UIView *view = panGestureRecognizer.view;if (panGestureRecognizer.state == UIGestureRecognizerStateBegan || panGestureRecognizer.state == UIGestureRecognizerStateChanged) {CGPoint translation = [panGestureRecognizer translationInView:view.superview];[view setCenter:(CGPoint){view.center.x + translation.x, view.center.y + translation.y}];[panGestureRecognizer setTranslation:CGPointZero inView:view.superview];}
}

[self addGestureRecognizerToView:view];

//如果处理的是图片，别忘了
[imageView setUserInteractionEnabled:YES];
[imageView setMultipleTouchEnabled:YES];

@interface YourViewController : UIViewController<UIGestureRecognizerDelegate>
{  CGFloat lastScale;  CGRect oldFrame;    //保存图片原来的大小  CGRect largeFrame;  //确定图片放大最大的程度
}  

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

// 处理缩放手势
- (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer
{  UIView *view = pinchGestureRecognizer.view;  if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged) {  view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale);  if (showImgView.frame.size.width < oldFrame.size.width) {  showImgView.frame = oldFrame;  //让图片无法缩得比原图小
        }  if (showImgView.frame.size.width > 3 * oldFrame.size.width) {  showImgView.frame = largeFrame;  }  pinchGestureRecognizer.scale = 1;  }
}