如何镜像UIBezierPath？ [英] How can I mirror a UIBezierPath?

问题描述

我有一个 UIBezierPath ，我想获取它的镜像。我该如何完成？

I have a UIBezierPath and I would like to get its mirror image. How can I accomplish this?

 // Method for generating a path
 UIBezierPath *myPath = [self generateAPathInBounds:boundingRect];

 // ? now I would like to mirror myPath ?

推荐答案

// Method for generating a path
UIBezierPath *myPath = [self generateAPathInBounds:boundingRect];

// Create two transforms, one to mirror across the x axis, and one to
// to translate the resulting path back into the desired boundingRect
CGAffineTransform mirrorOverXOrigin = CGAffineTransformMakeScale(-1.0f, 1.0f);
CGAffineTransform translate = CGAffineTransformMakeTranslation(boundingRect.width, 0);

// Apply these transforms to the path
[myPath applyTransform:mirrorOverXOrigin];
[myPath applyTransform:translate];

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