平移手势会扰乱基于旋转的方向

Question

我的手势识别器有一个小问题。

我有一个名为“Sprite”的类，它只是一个 UIImageView。 Sprite 有自己的手势识别器和处理方法，以便用户可以平移、旋转和调整图形大小。

这是我的代码：

    -(void)setup{ //sets up the imageview...
//add the image, frame, etc.
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
    UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];
    UIRotationGestureRecognizer *rotateGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotate:)];

    [self addGestureRecognizer:panGesture];
    [self addGestureRecognizer:pinchGesture];
    [self addGestureRecognizer:rotateGesture];
}

//handling methods
-(void)handlePinch:(UIPinchGestureRecognizer *)recognizer{
    recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
    recognizer.scale = 1;
}

-(void)handleRotate:(UIRotationGestureRecognizer *)recognizer{
    recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
    recognizer.rotation = 0;
}
-(void)handlePan:(UIPanGestureRecognizer *)recognizer{
    CGPoint translation = [recognizer translationInView:self];
    recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, recognizer.view.center.y + translation.y);
    [recognizer setTranslation:CGPointMake(0, 0) inView:self]
}

所以基本上每个人都可以自己正常工作。但是，当我旋转或调整 imageView 大小时，平移就会出现问题。例如，如果您上下颠倒旋转 imageView，则平移手势将沿相反方向移动图像（向上为向下，向左拖动将其向右移动，等等）。同样，调整大小的精灵将不会以与以前相同的速度/距离平移。

关于如何解决这个问题有什么想法吗？我更愿意将此代码保留在 Sprite 类中而不是 ViewController 中（如果可能的话）。谢谢。

Answer 1

不要尝试translationInView:self，而是尝试translationInView:self.superview。