镜像翻转CGPath

Question

我有一个简单的圆形CGPath。我在水平翻转它时遇到了困难，就像一面镜子的效果。

如果你正在回答这个问题，请尝试提供完整的代码，而不仅仅是一个通用的参考……

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];