How to animate CAShapeLayer path and fillColor

Question

How to animate CAShapeLayer path and fillColor?

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

Triumph

It animates automatically when you set it. Can you give a bit more information about what you are trying to achieve? – Virtuosic

Answer 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 :)

2021 Update

Swift

    myShapeLayer.strokeColor = UIColor.blue.cgColor
myShapeLayer.lineWidth = 5
myShapeLayer.fillColor = UIColor.yellow.cgColor

//Display it!
view.layer.addSublayer(myShapeLayer)

//Animate path
let pathAnimation = CABasicAnimation(keyPath: "strokeEnd")
pathAnimation.duration = 1.5
pathAnimation.fromValue = NSNumber(value: 0.0)
pathAnimation.toValue = NSNumber(value: 1.0)
pathAnimation.repeatCount = 10
pathAnimation.autoreverses = true
myShapeLayer.add(pathAnimation, forKey: "strokeEnd")


//Animate colorFill
let fillColorAnimation = CABasicAnimation(keyPath: "fillColor")
fillColorAnimation.duration = 1.5
fillColorAnimation.fromValue = UIColor.clear.cgColor
fillColorAnimation.toValue = UIColor.yellow.cgColor
fillColorAnimation.repeatCount = 10
fillColorAnimation.autoreverses = true
myShapeLayer.add(fillColorAnimation, forKey: "fillColor")

Triumph

I would add that fromValue and toValue could be CGMutablePathRef objects to animate changing the path itself, using key @"path". The above with that change worked for my purposes. Thanks. – Eerie