仅在 iphone sdk 中的捏合中增加高度？

Question

我有一个 imageview。当我添加捏合手势识别器时，它工作得很好。但是当我们水平捏合时，仅需要增加 Imageview 的宽度。当我们垂直捏合时，只需增加高度。请问我该怎么做？我编码如下，但是当我垂直捏合时，高度只需增加。但视图消失了。

- (id)initWithFrame:(CGRect)frame {

self = [super initWithFrame:frame];
if (self) {
    // Initialization code.
}

UIPinchGestureRecognizer *panGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];
[self addGestureRecognizer:panGestureRecognizer];
[panGestureRecognizer release];

return self;


}

   -(void) handlePinch:(UIPinchGestureRecognizer *)gesture 
   {

UIPinchGestureRecognizer *pinchGesture = (UIPinchGestureRecognizer *) gesture;




if ([pinchGesture state] == UIGestureRecognizerStateBegan){

    lastTouchPosition = [pinchGesture locationInView:self];

} else if ([gesture state] == UIGestureRecognizerStateBegan || [pinchGesture state] == UIGestureRecognizerStateChanged){

    CGPoint currentTouchLocation = [pinchGesture locationInView:self];
    CGPoint deltaMove =[self CGPointDistance:currentTouchLocation p2:lastTouchPosition];
    float distance = sqrt(deltaMove.x*deltaMove.x + deltaMove.y*deltaMove.y);
    float hScale = 1 - abs(deltaMove.x)/distance * (1-pinchGesture.scale);
    float vScale = 1 - abs(deltaMove.y)/distance * (1-pinchGesture.scale);
    self.transform = CGAffineTransformScale([self transform], hScale, vScale);

    lastTouchPosition = currentTouchLocation;
}

Answer 1

请参阅此主题。基本上，您必须对仿射变换使用不同的值。