删除UIBezierPath上的额外空间

Question

我已使用以下代码将UIBezerPath添加到UIView。

extension CGFloat {
    func toRadians() -> CGFloat {//0 360
        return self * CGFloat(Double.pi) / 180.0
    }
}

override func viewDidAppear(_ animated: Bool) {
    let trackLayer = CAShapeLayer()
    let circularPath = UIBezierPath(arcCenter: CGPoint(x: arcView.frame.size.width/2,
                                               y: arcView.frame.size.height),
                            radius: arcView.frame.size.height/2,
                            startAngle: CGFloat(180.0).toRadians(),
                            endAngle: CGFloat(0.0).toRadians(),
                            clockwise: true)

    trackLayer.path = circularPath.cgPath
    trackLayer.strokeColor = UIColor.red.cgColor
    trackLayer.lineWidth = 3
    trackLayer.fillColor = UIColor.clear.cgColor
    trackLayer.lineCap = kCALineCapButt

    arcView.layer.sublayers?.removeAll()
    arcView.layer.addSublayer(trackLayer)

}

但问题是它在顶部提供额外的不需要的空间，这是我不需要的。我尝试将各种值设置为circularPath，但未按要求设置。

Answer 1

以下是您的代码： -

let arcCenter = CGPoint(x: myview.frame.size.width / 2, y: myview.frame.size.height / 2)
let circleRadius = myview.frame.size.width / 2
let circlePath = UIBezierPath(arcCenter: arcCenter, radius: circleRadius, startAngle: CGFloat.pi, endAngle: CGFloat.pi * 2, clockwise: true)
let shapeLayer   = CAShapeLayer()
shapeLayer.path = circlePath.cgPath
shapeLayer.strokeColor = UIColor.red.cgColor
shapeLayer.fillColor = UIColor.blue.cgColor
shapeLayer.lineWidth = 5
myview.layer.addSublayer(shapeLayer)


// Make the view color transparent
   myview.backgroundColor = UIColor.clear

<强>输出： -

希望它有帮助。!!