为什么要旋转imageView，它会改变位置? [英] Why rotating imageView, it changes position?

问题描述

当我使用时:ImageView.transform = CGAffineTransformRotate(ImageView.transform，rotation);每次我旋转imageView和NSLog(@"x:％f y:％f"，ImageView.frame.orgin.x，ImageView.frame.orgin.y)时，x和y总是会更改值?为什么?

when I use: ImageView.transform = CGAffineTransformRotate(ImageView.transform, rotation); everytime I rotate imageView and I NSLog(@"x:%f y:%f", ImageView.frame.orgin.x, ImageView.frame.orgin.y), x and y always change value?? Why?

推荐答案

UIView

警告:如果此属性不是恒等变换，则frame属性的值未定义，因此应忽略.

Warning: If this property is not the identity transform, the value of the frame property is undefined and therefore should be ignored.

关于UIView的transform属性.由于您要分配给变换，因此很有可能不再是标识变换，因此帧值是不确定的，应该忽略.

regarding the transform property of a UIView. Since you are assigning to the transform it is most likely not the identity transform any more, hence the frame value is undefined, and should be ignored.

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