ios - 在 2D 中旋转 UIView，而不是 3D

Question

当我使用以下任一代码时，按钮会以 3D 方式而不是 2D 方式(平贴屏幕)旋转。如何避免 3D 行为？这是按钮在旋转期间的样子:

CGAffineTransform rotationTransform = CGAffineTransformIdentity;
    rotationTransform = CGAffineTransformRotate(rotationTransform, (offset/(180.0 * M_PI)));
    button.transform = rotationTransform;

.

    button.transform = CGAffineTransformRotate(CGAffineTransformIdentity, (offset/(180.0 * M_PI)));

.

button.transform = CGAffineTransformMakeRotation(offset/(180.0 * M_PI));

Answer 1

这是一位 Apple 员工的回答:

When you set a transform the frame becomes less well-defined, to the point that you should no longer use it to size or position a view. Try using the center property instead, your probably not getting a 3D rotation, but a distortion due to the compounding effect of setting the frame and trnsform.