ios - 变换 View ，保持 subview 大小

Question

我有一个 View ，用户可以通过 UIGestureRecognizer缩放 和旋转。该 View 包含两个 View :

 superview
  - content
  - button

content 应该缩放和旋转，button 应该保持它的大小和位置。
我在 CGAffineTransform 和 UIGestureRecognizer 的帮助下缩放和旋转 View 。

我怎样才能做到这一点？

我试过:

• 缩放/旋转 superview 并重置 button 变换和位置。没有成功。
• 缩放/旋转content 并尝试将content.frame.size 设置为superview。没有成功。 (虽然我认为这必须以某种方式起作用)。
• 还有一些不为人知的坏事，不值得一提。

编辑:

处理旋转和缩放的代码:

if ([recognizer respondsToSelector:@selector(rotation)]) {
    CGFloat rotation = 0.0f - (self.lastRotation - [(UIRotationGestureRecognizer *) recognizer rotation]);

    CGAffineTransform currentTransform = self.content.transform;
    CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform, rotation);
    self.content.transform = newTransform;

    self.lastRotation = [(UIRotationGestureRecognizer *) recognizer rotation];

} else if ([recognizer respondsToSelector:@selector(scale)]) {
    CGFloat scale = 1.0f - (self.lastScale - [(UIPinchGestureRecognizer *) recognizer scale]);

    CGAffineTransform currentTransform = self.content.transform;
    CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
    self.content.transform = newTransform;

    self.lastScale = [(UIPinchGestureRecognizer *) recognizer scale];
}

只是基本的缩放和旋转，没什么特别的。

Answer 1

实际解决方案:

if ([recognizer respondsToSelector:@selector(rotation)]) {
    CGFloat rotation = 0.0f - (self.lastRotation - [(UIRotationGestureRecognizer *) recognizer rotation]);

    CGAffineTransform currentTransform = self.transform;
    CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform, rotation);
    self.transform = newTransform;

    self.lastRotation = [(UIRotationGestureRecognizer *) recognizer rotation];

} else if ([recognizer respondsToSelector:@selector(scale)]) {
    CGFloat scale = 1.0f - (self.lastScale - [(UIPinchGestureRecognizer *) recognizer scale]);

    CGRect bounds = self.bounds;
    bounds.size.width *= scale;
    bounds.size.height *= scale;
    self.bounds = bounds;

    self.lastScale = [(UIPinchGestureRecognizer *) recognizer scale];
}