xcode IOS：旋转 uiimageview
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IOS: rotate an uiimageview
提问by cyclingIsBetter
in my app I have an imageview, its name is arrow and I rotate it of 180 degrees in this way:
在我的应用程序中，我有一个图像视图，它的名称是箭头，我以这种方式将它旋转 180 度：
arrow.transform = CGAffineTransformMakeRotation(M_PI);
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?
它工作正常，但现在我希望这个图像视图返回到原始位置；我应该设置以获得它的价值是多少？
回答by pasawaya
To make it return to it's original position, just do this:
要使其恢复到原来的位置，只需执行以下操作：
arrow.transform = CGAffineTransformMakeRotation(0);
In degrees, 0 radians is 0 degrees, so it should return to its original position.
以度为单位，0 弧度就是 0 度，所以它应该回到原来的位置。
回答by Bill Wilson
Try setting the transformproperty back to the identity matrix. i.e. CGAffineTransformIdentity
尝试将该transform属性设置回单位矩阵。IECGAffineTransformIdentity
回答by Darius Miliauskas
Swift3:
斯威夫特3：
arrow.transform = CGAffineTransform(rotationAngle: rotation);
where rotationis the angle to rotate in radians.
其中，rotation是以弧度为单位旋转的角度。
