如何在iPhone sdk的触摸方向上拉伸图像？

Question

我正在定制图像。我的要求是在触摸方向上拉伸或缩小图像&裁剪图像。我做了剪裁，但我怎么可以在触摸方向拉伸&缩小图像。可能吗？

Answer 1

你的问题不清楚，但如果你想缩放或旋转图像触摸event.then在viewdidload写这段代码。

UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] 
initWithTarget:self action:@selector(rotateImage:)]; 
[self.view addGestureRecognizer:rotationGesture]; 
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] 
initWithTarget:self action:@selector(scaleImage:)]; 
[self.view addGestureRecognizer:pinchGesture]; 
[pinchGesture release]; 

使用此代码，您可以在触摸方向上旋转或缩放图像。

- (void)scaleImage:(UIPinchGestureRecognizer *)recognizer 
{ 
if([recognizer state] == UIGestureRecognizerStateEnded) { 
    previousScale = 1.0; 
    return; 
} 
CGFloat newScale = 1.0 - (previousScale - [recognizer scale]); 
CGAffineTransform currentTransformation = yourimage.transform; 
CGAffineTransform newTransform = CGAffineTransformScale(currentTransformation, 
newScale, newScale); 
    yourimage.transform = 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 = yourimage.transform; 
CGAffineTransform newTransform = CGAffineTransformRotate(currentTransformation, newRotation); 
yourimage.transform = newTransform; 
previousRotation = [recognizer rotation]; 

}