swift - UIView 的圆角曲线边缘

Question

我正在尝试通过此扩展添加圆角边缘，但是我在 iPhone X 中得到了正确的圆角 UIView 但是当我尝试在 中运行相同的代码时>iPhone 6s 好像没有弯曲，试过增加desiredCurve 还是看不到曲线。

extension UIView {


    /* Usage Example
     * bgView.addBottomRoundedEdge(desiredCurve: 1.5)
     */
    func addBottomRoundedEdge(desiredCurve: CGFloat?) {
        let offset: CGFloat = self.frame.width / desiredCurve!
        let bounds: CGRect = self.bounds

        let rectBounds: CGRect = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: bounds.size.width, height: bounds.size.height / 2)
        let rectPath: UIBezierPath = UIBezierPath(rect: rectBounds)
        let ovalBounds: CGRect = CGRect(x: bounds.origin.x - offset / 2, y: bounds.origin.y, width: bounds.size.width + offset, height: bounds.size.height)
        let ovalPath: UIBezierPath = UIBezierPath(ovalIn: ovalBounds)
    rectPath.append(ovalPath)

        // Create the shape layer and set its path
        let maskLayer: CAShapeLayer = CAShapeLayer()
        maskLayer.frame = bounds
        maskLayer.path = rectPath.cgPath

        // Set the newly created shape layer as the mask for the view's layer
        self.layer.mask = maskLayer
    }
}

Answer 1

调用 addBottomRoundedEdge 扩展方法在 UIView 上添加底部曲线

extension UIView {

    func dropShadow(scale: Bool = true) {
        layer.masksToBounds = true
        layer.shadowColor = UIColor.lightGray.cgColor
        layer.shadowOpacity = 0.8
        layer.shadowOffset = CGSize(width: 0, height: 5)
        layer.shadowRadius = 2
        layer.borderWidth = 1
        layer.shouldRasterize = true
        layer.rasterizationScale = scale ? UIScreen.main.scale : 1
        layer.borderColor =  UIColor(red:222/255, green:225/255, blue:227/255, alpha: 1).cgColor
        layer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: 5).cgPath
   }

    func addBottomRoundedEdge() {
        let offset: CGFloat = (self.frame.width * 1.5)
        let bounds: CGRect = self.bounds

        let rectBounds: CGRect = CGRect(x: bounds.origin.x, y: bounds.origin.y, width: bounds.size.width , height: bounds.size.height / 2)
        let rectPath: UIBezierPath = UIBezierPath(rect: rectBounds)
        let ovalBounds: CGRect = CGRect(x: bounds.origin.x - offset / 2, y: bounds.origin.y, width: bounds.size.width + offset , height: bounds.size.height)
        let ovalPath: UIBezierPath = UIBezierPath(ovalIn: ovalBounds)
        rectPath.append(ovalPath)

        let maskLayer: CAShapeLayer = CAShapeLayer()
        maskLayer.frame = bounds
        maskLayer.path = rectPath.cgPath

        self.layer.mask = maskLayer
    }

}