Created
January 31, 2020 07:57
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class GradientCircle: UIView, CAAnimationDelegate { | |
let gradientLayer: CAGradientLayer = CAGradientLayer() | |
var startAngle: CGFloat = (-(.pi) / 2) | |
var endAngle: CGFloat = 3 * ((.pi) / 2) | |
override func draw(_ rect: CGRect) { | |
let center = CGPoint(x: rect.midX, y: rect.midY) | |
let animation = CABasicAnimation(keyPath: "strokeEnd") | |
self.gradientLayer.colors = [UIColor.blue.cgColor, UIColor.cyan.cgColor] | |
self.gradientLayer.startPoint = CGPoint(x: 0.5, y: 0.5) | |
self.gradientLayer.endPoint = CGPoint(x: 0.0, y: 0) | |
self.gradientLayer.type = .conic | |
self.gradientLayer.frame = rect | |
self.layer.addSublayer(self.gradientLayer) | |
animation.fromValue = 0 | |
animation.toValue = 1 | |
animation.duration = 1 | |
animation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeOut) | |
animation.delegate = self | |
let path = UIBezierPath(arcCenter: center, radius: 60, startAngle: startAngle, endAngle: endAngle - (.pi / 2), clockwise: true) | |
let sliceLayer = CAShapeLayer() | |
sliceLayer.path = path.cgPath | |
sliceLayer.fillColor = nil | |
sliceLayer.lineCap = .round | |
sliceLayer.strokeColor = UIColor.black.cgColor | |
sliceLayer.lineWidth = 20 | |
sliceLayer.strokeEnd = 1 | |
sliceLayer.add(animation, forKey: animation.keyPath) | |
self.layer.mask = sliceLayer | |
} | |
} |
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