UIView+CAGradientLayer.swift

//  Created by Evgeny Konkin on 17.06.2019.

// Liner Gradient
extension UIView {
    func addGradientToView() {
        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = self.bounds
        self.layer.insertSublayer(gradientLayer, at: 0)
        gradientLayer.locations = [0.0, 0.4, 1.0]
        gradientLayer.colors = [
            UIColor(hexString: "#1C1D27", alpha: 1).cgColor, // top
            UIColor(hexString: "#1C1D27", alpha: 0.5).cgColor, // middle
            UIColor(hexString: "#1C1D27", alpha: 1).cgColor // bottom
        ]
    }
    
    func removeGradientFromView() {
        let gradientLayers = self.layer.sublayers?.filter({ $0 is CAGradientLayer }) as! [CAGradientLayer]
        for layer in gradientLayers {
            layer.removeFromSuperlayer()
        }
    }
}


// Radial Gradient
extension UIView {
    func addGradient() {        
        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = self.bounds
        self.layer.insertSublayer(gradientLayer, at: 0)
        gradientLayer.locations = [0, 1]
        gradientLayer.type = .radial
        gradientLayer.startPoint = CGPoint(x: 0.5, y: 0.5)
        gradientLayer.endPoint = CGPoint(x: 1, y: 1)
        gradientLayer.colors = [
            UIColor.red.cgColor, // center color
            UIColor.white.cgColor
        ]
    }
}