使用手势对UIImageView进行缩放、旋转和移动

  

   

    

     

    
    

     

      // 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];  
     
    
  
 

文章来源: zzzili.blog.csdn.net，作者：清雨小竹，版权归原作者所有，如需转载，请联系作者。

原文链接：zzzili.blog.csdn.net/article/details/51145044