CAKeyframeAnimation從頭到尾重復動畫

Question

我需要從起點到終點以及從終點到起點為UIImageView添加無限動畫。 我正在這樣嘗試：

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從起點移動到結束可以，但是在此之后，移動到起點並從起點到終點重復動畫。 因此，從終點到起點都沒有動畫。 有可能嗎？

Answer 1

以與您過來時相同的方式進行動畫制作，就像將自動autoreverses設置為YES一樣簡單。

就是說，如果這確實是一個無限的動畫，那么您就不需要fillMode或removedOnCompletion

Answer 2

我是你，我只會使用：

[UIVIew animateWithDuration:delay:options:animations:completion:]

與選項

UIViewAnimationOptionRepeat