绘制带弧度的视图

CAShapeLayer.swift

    /// 带弧度的 View
    public static func createCurveView(frame: CGRect, curveScale: CGFloat, fillColor: UIColor = UIColor.white) -> UIView {
        let view = UIView(frame: frame)
        view.backgroundColor = UIColor.clear
        
        let finalSize = CGSize(width: UIScreen.main.bounds.size.width, height: frame.size.height)
        let layer = CAShapeLayer()
        let bezier = UIBezierPath()
        bezier.move(to: CGPoint(x:0, y:0))
        bezier.addLine(to: CGPoint(x:0, y:finalSize.height))
        bezier.addLine(to: CGPoint(x:finalSize.width, y:finalSize.height))
        bezier.addLine(to: CGPoint(x:finalSize.width, y:0))
        bezier.addQuadCurve(to: CGPoint(x:0,y:0),
                            controlPoint: CGPoint(x:finalSize.width / 2, y:curveScale))
        layer.path = bezier.cgPath
        layer.fillColor = fillColor.cgColor
        view.layer.addSublayer(layer)
        return view
    }