小编Ben*_*son的帖子

所以我正在尝试制作一个进度条。所以我制作了圆形路径，但我希望点位于进度条的末尾，但是如何使点的位置位于当前进度的末尾？

private func simpleShape() {
  let width: CGFloat = 10
  createCircle()

  //make circle transparant in middle
  progressLayer.fillColor = UIColor.clear.cgColor
  progressLayer.strokeColor = UIColor.blue.cgColor
  progressLayer.lineCap = CAShapeLayerLineCap.round
  progressLayer.lineWidth = width
  progressLayer.strokeStart = 0
  progressLayer.strokeEnd = 0

  //unfilled
  backLayer.lineWidth = width
  backLayer.strokeColor = #colorLiteral(red: 0.1411764706, green: 0.1725490196, blue: 0.2431372549, alpha: 1).cgColor
  backLayer.strokeEnd = 1

  self.layer.addSublayer(gradientLayer)
}

private func createCircle() {

  //create circle
  let circle = UIView(frame: bounds)
  circle.layoutIfNeeded()
  let centerPoint = CGPoint (x: circle.bounds.width / 2, y: circle.bounds.width / 2)
  let circleRadius: CGFloat …