iphone - 如何为 CAShapeLayer 路径和 fillColor 设置动画

Question

如何为 CAShapeLayer 路径和填充颜色设置动画？

如何为 strokeEnd 设置动画以显示正在绘制的路径？以及如何为 fillColor 设置动画？

Answer 1

动画路径

  //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"];

希望对您有所帮助:)

2021 年更新

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")