使用手势对UIImageView进行缩放、旋转和移动

骑猪看日落 2023-10-16 23:27 15阅读 0赞

// 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];