iOS:在 UIView 中以百分比形式绘制圆圈

Question

我有一个圆形的 UIView，我需要以百分比值显示 UIView 边框颜色，如果百分比值为 50%，它应该填充一半边框颜色的 UIView。我使用了 UIBeizer 路径 addArcWithCenter 但是我没有得到完美的解决方案。请在这方面帮助我

Answer 1

你可以用下面的代码实现它，只需调整strokeStart和strokeEnd:

    // round view
    let roundView = UIView(frame: CGRectMake(100, 100, 250, 250))
    roundView.backgroundColor = UIColor.whiteColor()
    roundView.layer.cornerRadius = roundView.frame.size.width / 2

    // bezier path
    let circlePath = UIBezierPath(arcCenter: CGPoint (x: roundView.frame.size.width / 2, y: roundView.frame.size.height / 2),
                                  radius: roundView.frame.size.width / 2,
                                  startAngle: CGFloat(-0.5 * M_PI),
                                  endAngle: CGFloat(1.5 * M_PI),
                                  clockwise: true)
    // circle shape
    let circleShape = CAShapeLayer()
    circleShape.path = circlePath.CGPath
    circleShape.strokeColor = UIColor.redColor().CGColor
    circleShape.fillColor = UIColor.clearColor().CGColor
    circleShape.lineWidth = 1.5
    // set start and end values
    circleShape.strokeStart = 0.0
    circleShape.strokeEnd = 0.8

    // add sublayer
    roundView.layer.addSublayer(circleShape)
    // add subview
    self.view.addSubview(roundView)