ios - 如何镜像 UIBezierPath？

Question

我有一个UIBezierPath，我想得到它的镜像。我怎样才能做到这一点？

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

 // ? now I would like to mirror myPath ?

Answer 1

// 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];