如何将角半径添加到UIBezier路径弧

Question

我正在使用UIBezierPath arc方法创建一个弧.我想要将圆弧的两端修圆 - 请参阅附图,了解具体要求!circularRect版本中使用的cornerRadius选项不适用于arc方法.任何人都有关于如何实现这一目标的想法？提前致谢.(这与先前提出的问题不同,因为它提供了确切的要求)

 let center = CGPoint(x:bounds.width/2, y: bounds.height/2)
 let radius: CGFloat = max(bounds.width, bounds.height)
 let arcWidth: CGFloat = 10
 let startAngle: CGFloat = 4.6 / 3 * ?
 let endAngle: CGFloat = 4.4 / 3 * ?

 let path = UIBezierPath(arcCenter: center, radius: radius/2 - arcWidth/2, startAngle: startAngle, endAngle: endAngle, clockwise: true)

 path.lineWidth = arcWidth
 // all thats needed to make the ends rounded is
 path.lineCapStyle = .Round
 path.stroke()

Answer 1

解

实际上诀窍是lineCap属性.您可以使用以下代码.

func drawCircle(view: UIView, startingAngle: CGFloat, endAngle: CGFloat) -> CAShapeLayer {
    let path = UIBezierPath(arcCenter: view.center, radius: CGFloat((view.bounds.size.height/2) - 10), startAngle: startingAngle, endAngle:endAngle, clockwise: true)

    let shapeLayer = CAShapeLayer()
    shapeLayer.path = path.CGPath

    shapeLayer.strokeColor = UIColor.blackColor().CGColor
    shapeLayer.lineWidth = 10.0
    shapeLayer.fillColor = UIColor.clearColor().CGColor
    shapeLayer.lineCap = kCALineCapRound

    view.layer.addSublayer(shapeLayer)

    return shapeLayer
}

结果

Answer 2

所需要做的就是添加一行代码：path.lineCapStyle = .Round。