objective-c - 如何缩放和平滑旋转？

Question

我看过一些应用程序，它们能够同时缩放和旋转图像。不需要释放手指触摸。

我的以下代码要求:
1.轻触即可缩放
2.释放
3.触摸以旋转

如何同时缩放和旋转？

在我的主要代码中:

UIPanGestureRecognizer *imagePanGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(moveImage:)];
[imagePanGesture setMinimumNumberOfTouches:1];
[imagePanGesture setMaximumNumberOfTouches:1];
[tempImageView addGestureRecognizer:imagePanGesture]; 

UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scaleImage:)];
[tempImageView addGestureRecognizer:pinchGesture];  

UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateImage:)];
[tempImageView addGestureRecognizer:rotationGesture]; 

以个人比例旋转

- (void)scaleImage:(UIPinchGestureRecognizer *)recognizer 
{
    if([recognizer state] == UIGestureRecognizerStateEnded) 
    {
        previousScale = 1.0;
        return;
    }

    CGFloat newScale = 1.0 - (previousScale - [recognizer scale]);

    CGAffineTransform currentTransformation = [recognizer view].transform;
    CGAffineTransform newTransform = CGAffineTransformScale(currentTransformation, newScale, newScale);

    [[recognizer view] setTransform:newTransform];
    previousScale = [recognizer scale];
}

- (void)rotateImage:(UIRotationGestureRecognizer *)recognizer 
{
    if([recognizer state] == UIGestureRecognizerStateEnded) {


            previousRotation = 0.0;
            return;
        }

        CGFloat newRotation = 0.0 - (previousRotation - [recognizer rotation]);

        CGAffineTransform currentTransformation = [recognizer view].transform;
        CGAffineTransform newTransform = CGAffineTransformRotate(currentTransformation, newRotation);

        [[recognizer view] setTransform:newTransform];

        previousRotation = [recognizer rotation];
    }

Answer 1

您可以检查此http://www.raywenderlich.com/6567/uigesturerecognizer-tutorial-in-ios-5-pinches-pans-and-more