ios - CAKeyframeAnimation 从头到尾重复动画

Question

我需要为 UIImageView 添加从起点到终点以及之后从终点到起点的无限动画。 我正在尝试这样:

CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
pathAnimation.calculationMode = kCAAnimationPaced;
pathAnimation.fillMode = kCAFillModeForwards;
pathAnimation.removedOnCompletion = NO;
pathAnimation.duration = 2.0;
pathAnimation.repeatCount = HUGE_VALF;
pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

CGPoint endPoint = CGPointMake(320.0f - 30.0f, self.myImage.frame.size.height);
CGMutablePathRef curvedPath = CGPathCreateMutable();
CGPathMoveToPoint(curvedPath, NULL, self.myImage.frame.origin.x, self.myImage.frame.origin.y);
CGPathAddCurveToPoint(curvedPath, NULL, endPoint.x, self.myImage.frame.origin.y,
                      endPoint.x, self.myImage.frame.origin.y, endPoint.x, endPoint.y);
pathAnimation.path = curvedPath;
CGPathRelease(curvedPath);

[self.myImage.layer addAnimation:pathAnimation forKey:@"curveAnimation"];

myImage 可以从起点移动到终点，但之后移动到起点并从起点到终点重复动画。所以，从终点到起点没有动画。可以吗？

Answer 1

动画以与您来时相同的方式返回就像将 autoreverses 设置为 YES 一样简单。

也就是说，如果它真的是一个无限动画，那么您就不需要 fillMode 或 removedOnCompletion