IOS:旋转 uiimageview [英] IOS: rotate an uiimageview

问题描述

在我的应用程序中，我有一个图像视图，它的名称是箭头，我以这种方式将其旋转 180 度:

in my app I have an imageview, its name is arrow and I rotate it of 180 degrees in this way:

arrow.transform = CGAffineTransformMakeRotation(M_PI);

它工作正常，但现在我希望这个图像视图返回到原始位置；我应该设置什么值才能获得它?

it work fine, but now I want that this imageview return in the original position; what's the value taht I should set to obtain it?

推荐答案

要让它回到原来的位置，只需这样做:

To make it return to it's original position, just do this:

arrow.transform = CGAffineTransformMakeRotation(0);

以度为单位，0 弧度就是 0 度，所以它应该回到原来的位置.

In degrees, 0 radians is 0 degrees, so it should return to its original position.

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