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let shapeLayer = CAShapeLayer()
let center = CGPoint(x: myView.frame.width / 2, y: myView.frame.height / 2)
let radius = ([myView.frame.width, myView.frame.height].min()! / 2) - 5
let circularPath = UIBezierPath(arcCenter: center, radius: radius, startAngle: -CGFloat.pi, endAngle: CGFloat.pi, clockwise: true)
shapeLayer.path = circularPath.cgPath
shapeLayer.strokeColor = strokeColor
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.lineWidth = 10
shapeLayer.strokeEnd = 0.5
let gradient = CAGradientLayer()
gradient.colors = [UIColor(red: 1, green: 0, blue: 0, alpha: 1).cgColor, UIColor(red: 0, green: 1, blue: 0, alpha: 1).cgColor]
gradient.frame = circularPath.bounds
gradient.startPoint = CGPoint(x: 0, y: 0)
gradient.endPoint = CGPoint(x: 1, y: 0)
gradient.mask = shapeLayer
myView.layer.addSublayer(gradient)b
let shapeLayer = CAShapeLayer()
let center = CGPoint(x: myView.frame.width / 2, y: myView.frame.height / 2)
let radius = ([myView.frame.width, myView.frame.height].min()! / 2) - 5
let circularPath = UIBezierPath(arcCenter: center, radius: radius, startAngle: -CGFloat.pi, endAngle: CGFloat.pi, clockwise: true)
shapeLayer.path = circularPath.cgPath
shapeLayer.strokeColor = strokeColor
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.lineWidth = 10
shapeLayer.strokeEnd = 0.5
let gradient = CAGradientLayer()
gradient.colors = [UIColor(red: 1, green: 0, blue: 0, alpha: 1).cgColor, UIColor(red: 0, green: 1, blue: 0, alpha: 1).cgColor]
gradient.frame = circularPath.bounds
gradient.startPoint = CGPoint(x: 0, y: 0)
gradient.endPoint = CGPoint(x: 1, y: 0)
gradient.mask = shapeLayer
myView.layer.addSublayer(gradient)b
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