如何快速添加UIView角半径和阴影效果

Question

我已经尝试了许多在overstackoverflow中可用的解决方案，但没有任何效果。这是我为dropShadow效果编写的扩展名。

extension UIView {
    func dropShadow(color: UIColor, opacity: Float = 0.4, offSet: CGSize, shadowRadius: CGFloat = 1, scale: Bool = true, cornerRadius: CGFloat) {
        let shadowLayer = CAShapeLayer()
        shadowLayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).cgPath
        shadowLayer.fillColor = UIColor.white.cgColor
        shadowLayer.shadowColor = color.cgColor
        shadowLayer.shadowPath = shadowLayer.path
        shadowLayer.shadowOffset = offSet
        shadowLayer.shadowOpacity = opacity
        shadowLayer.shadowRadius = shadowRadius
        layer.insertSublayer(shadowLayer, at: 0)
    }
}

在这里，我使用的扩展名是：

override func layoutSubviews() {
        contentView.backgroundColor = UIColor.clear
        backgroundColor = UIColor.clear
        backView.dropShadow(color: .black, offSet: CGSize(width: 0.0, height: 3.0), cornerRadius: 20)
        backView.layer.cornerRadius = 20
        let gradientLayer = CAGradientLayer()
        gradientLayer.colors = [colorTop, colorBottom]
        gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.5)
        gradientLayer.endPoint = CGPoint(x: 1.0, y: 1.5)
        gradientLayer.frame.size = self.backView.frame.size
        backView.layer.insertSublayer(gradientLayer, at:1)
    }

这是我得到的结果：

正如您在屏幕快照中看到的那样，我正在获得阴影半径，但UIView半径仍然相同。那么如何获得那个角半径。我从早晨开始挣扎。任何帮助将不胜感激。预先感谢。

Answer 1

我忘了添加gradientLayer的拐角半径。

override func layoutSubviews() {
        contentView.backgroundColor = UIColor.clear
        backgroundColor = UIColor.clear
        backView.dropShadow(color: .black, offSet: CGSize(width: 0.0, height: 3.0), cornerRadius: 10)
        backView.layer.cornerRadius = 20
        let gradientLayer = CAGradientLayer()
        gradientLayer.colors = [colorTop, colorBottom]
        gradientLayer.startPoint = CGPoint(x: 0.0, y: 1.5)
        gradientLayer.endPoint = CGPoint(x: 1.0, y: 1.5)
        gradientLayer.cornerRadius = 10 .  <--- this was missing
        gradientLayer.frame.size = self.backView.frame.size
        backView.layer.insertSublayer(gradientLayer, at:1)
    }