如何将 UIImageView 旋转 20 度? [英] How can I rotate an UIImageView by 20 degrees?

问题描述

What do I have to do, if I need to rotate a UIImageView? I have a UIImage which I want to rotate by 20 degrees.

The Apple docs talk about a transformation matrix, but that sounds difficult. Are there any helpful methods or functions to achieve that?

解决方案

A transformation matrix is not incredibly difficult. It's quite simple, if you use the supplied functions:

imgView.transform = CGAffineTransformMakeRotation(.34906585);

(.34906585 is 20 degrees in radians)

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Swift 5:

imgView.transform = CGAffineTransform(rotationAngle: .34906585)

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