镜像翻转CGPath

Question

我有一个简单的圆形CGPath。 我无法水平翻转它，就像镜子效果一样。

如果你回答这个问题之前，请尽量提供一个完整的代码，而不是只属一般参考...

THX

Answer 1

UIBezierPath* aPath = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, -240, 240, 240)]; 

// This will mirror the path 

CGAffineTransform rotation = CGAffineTransformMakeScale(1.0, -1.0); 

CGMutablePathRef f = CGPathCreateMutable(); 
CGPathAddPath(f, &rotation, aPath.CGPath); 

CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"]; 
pathAnimation.calculationMode = kCAAnimationPaced; 
pathAnimation.fillMode = kCAFillModeRemoved; 
pathAnimation.rotationMode = kCAAnimationRotateAutoReverse; 
pathAnimation.removedOnCompletion = NO; 
pathAnimation.path = f; 
pathAnimation.repeatCount = HUGE_VALF;; 
pathAnimation.duration = 5.0f; 
[r2.layer addAnimation:pathAnimation forKey:nil];