CashApelayer路径动画 - 缩小圆圈

Question

我正在尝试缩小循环现金帕特莱耶尔，但使用键路径'的路径'似乎不起作用。

CGPathRef startPath = [UIBezierPath bezierPathWithOvalInRect:startRect].CGPath;
CGPathRef endPath   = [UIBezierPath bezierPathWithOvalInRect:CGRectInset(startRect, 15, 15)].CGPath;
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"path"];
animation.duration          = 1.0;
animation.fromValue         = (__bridge id)startPath;
animation.toValue           = (__bridge id)endPath;
animation.autoreverses      = YES;
animation.repeatCount       = CGFLOAT_MAX;
animation.timingFunction    = [CAMediaTimingFunction functionWithControlPoints:0.6 :0.3 :0.8 :0.45];
//circleLayer is a CAShapeLayer
[self.circleLayer addAnimation:animation forKey:@"pathAnimation"];

我认为我一定会误解路径动画的工作原理，因为如果我试图为不透明度或转换动画，几乎相同的代码似乎可以正常工作。

。

有什么想法吗？

Answer 1

我最近也有相同的问题，最终通过创建圆圈，然后使刻度cgaffineTransform进行动画解决。在视图中，谁是圆圈，我只是使用

CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformScale(transform, scaleX, scaleY);
[UIView animateWithDuration: 0.5 animations: ^{
    self.transform = transform;
}];

希望这会有所帮助！