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

问题描述

如果我需要旋转 UIImageView ，我该怎么办？我有一个 UIImage ，我想旋转20度。

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.

苹果文档谈论一个转换矩阵，但这听起来很难。是否有任何有用的方法或函数来实现？

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

推荐答案

转换矩阵不是难以置信的困难。这很简单，如果你使用提供的函数：

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

imgView.transform = CGAffineTransformMakeRotation(.34906585);

（。34906585是20度弧度）

(.34906585 is 20 degrees in radians)

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