CALayer旋转变换的奇怪行为

Question

I'm using CALayer for interactive book engine and want to rotate CALayer around it center but when I apply rotation transform (using angle which is based on user input) to CALayer it goes crazy: layer stretches and moves in very strange way and disappears. What I do is

[CATransaction begin];
[CATransaction setValue: (id) kCFBooleanTrue forKey: kCATransactionDisableActions];
...
layer.transform = CATransform3DMakeRotation(angle, 0, 0, 1);
...
[CATransaction commit];

Interestingly, when my angle is M_PI or M_PI/2, or it's scale transform everything is ok, but when its rotation and any other angles layer goes crazy.

Does anybody know what's happening and how to fix it?

Answer 1

发现其原因自己：这是因为在并行使用I移动层.frame代替.position属性：帧属性本身是基于变换从而设置它产生了“疯狂”行为计算。