CALayer geometryFlipped如何完全表现？

Question

假设我有一个名为somePath的CGPathRef，我这样做：

CAShapeLayer *shapeLayer = [[CAShapeLayer alloc] init];
shapeLayer.path = somePath;
shapeLayer.geometryFlipped = YES;

但由于某种原因，我不想翻转几何 - 我想做这样的事情：

CAShapeLayer *shapeLayer = [[CAShapeLayer alloc] init];
CGAffineTransform flipTransform = ........;
shapeLayer.path = CGPathApplyAffineTransform(somePath, &flipTransform);
shapeLayer.geometryFlipped = NO;

flipTransform如何使图层显示与以前完全相同？

：）

Answer 1

CGAffineTransform flipTransform = CGAffineTransformMakeScale(1, -1);