使用手势对UIImageView进行缩放、…

需要添加协议

// 添加所有的手势

- (void) addGestureRecognizerToView:(UIView *)view

{

    // 旋转手势

   UIRotationGestureRecognizer *rotationGestureRecognizer =[[UIRotationGestureRecognizer alloc] initWithTarget:selfaction:@selector(rotateView:)];

    [viewaddGestureRecognizer:rotationGestureRecognizer];

    

    // 缩放手势

    UIPinchGestureRecognizer*pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchView:)];

    [viewaddGestureRecognizer:pinchGestureRecognizer];

    

    // 移动手势

    UIPanGestureRecognizer*panGestureRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panView:)];

    [viewaddGestureRecognizer: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 = [panGestureRecognizertranslationInView:view.superview];

       [view setCenter:(CGPoint){view.center.x +translation.x, view.center.y + translation.y}];

       [panGestureRecognizer setTranslation:CGPointZeroinView:view.superview];

    }

}

 

//如果处理的是图片，别忘了

[imageView setUserInteractionEnabled:YES]; 

[imageViewsetMultipleTouchEnabled:YES];