How to animate CAShapeLayer path and fillColor

问题:

How to animate CAShapeLayer path and fillColor?

How to animate strokeEnd to show the path being drawn? and how to animate fillColor?

回答1:

To animate path

  //setup the CAShapeLayer
myShapeLayer.strokeColor = [[UIColor blueColor] CGColor];
myShapeLayer.lineWidth = 5;
myShapeLayer.fillColor = [[UIColor yellowColor] CGColor];



//Display it!
[self.view.layer addSublayer:myShapeLayer];

//Animate path
CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
pathAnimation.duration = 1.5f;
pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
pathAnimation.toValue = [NSNumber numberWithFloat:1.0f];
pathAnimation.repeatCount = 10;
pathAnimation.autoreverses = YES;
[myShapeLayer addAnimation:pathAnimation forKey:@"strokeEnd"];

//Animate colorFill
CABasicAnimation *fillColorAnimation = [CABasicAnimation animationWithKeyPath:@"fillColor"];
fillColorAnimation.duration = 1.5f;
fillColorAnimation.fromValue = (id)[[UIColor clearColor] CGColor];
fillColorAnimation.toValue = (id)[[UIColor yellowColor] CGColor];
fillColorAnimation.repeatCount = 10;
fillColorAnimation.autoreverses = YES;
[myShapeLayer addAnimation:fillColorAnimation forKey:@"fillColor"];

I hope this helps :)