iPhone使CALayer倾斜 [英] iPhone skew a CALayer

问题描述

我是一个初学者，我正在做一些练习以使自己熟悉CALayer ...

I'm a beginner and I am doing some exercises to familiarize myself with CALayer ...

我只是想知道如何倾斜（或倾斜） ）的CALayer 45°角？

I just want to know how to "incline" (or skew) a CALayer 45° angle ?

谢谢。

推荐答案

您可以执行此操作，但必须弄乱层的 transform 属性，即 struct CATransform3D 。您将需要做一些矢量数学操作。请参阅compute_transform_matrix（...）函数2352402>此答案以获取更多详细信息。

You could do this but you would have to mess with the layer's transform property, which is a struct CATransform3D. You're going to have to do some vector math to do this, as you . See the compute_transform_matrix(...) function from this answer for more details.

您需要执行以下操作：

CGRect r = layer.bounds;
layer.transform = compute_transform_matrix(r.origin.x,    r.origin.y,                 r.size.width,                 r.size.height,
                                           r.size.height, r.origin.y,                 r.size.width + r.size.height, r.origin.y,
                                           r.origin.x,    r.origin.y + r.size.height, r.size.width,                 r.origin.y );

检查我的数学。应该是对的。

Check my math on this. It should be right.

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