ios开发--旋转、移动、缩放手势实例代码

// 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];  
•     }  
• }  

别忘了

[self addGestureRecognizerToView:view];

如果处理的是图片，别忘了

 

[imageView setUserInteractionEnabled:YES];
[imageView setMultipleTouchEnabled:YES];