Apply gradient to view + Corner radius particular side to view + Anchors

UIView+Extension.swift

import UIKit

extension UIView {
    
    enum gradientType {
        case vertical
        case horizontal
        case cross
    }
    
    func applyGradient(colors:[UIColor], type: gradientType) {
        var endPoint: CGPoint!
        switch (type) {
        case .horizontal:
            endPoint = CGPoint(x: 1, y: 0)
        case .vertical:
            endPoint = CGPoint(x: 0, y: 1)
        case .cross:
            endPoint = CGPoint(x: 1, y: 1)
        }
        self.layoutIfNeeded()
        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = self.bounds
        gradientLayer.colors = colors.map{ $0.cgColor}
        gradientLayer.startPoint = CGPoint(x: 0, y: 0)
        gradientLayer.endPoint = endPoint
        //self.layer.addSublayer(gradientLayer)
        self.layer.insertSublayer(gradientLayer, at: 0)
    }
    
    func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        self.layer.mask = mask
    }
    
    // Anchors
    public func fillSuperview() {
        translatesAutoresizingMaskIntoConstraints = false
        if let superview = superview {
            leftAnchor.constraint(equalTo: superview.leftAnchor).isActive = true
            rightAnchor.constraint(equalTo: superview.rightAnchor).isActive = true
            topAnchor.constraint(equalTo: superview.topAnchor).isActive = true
            bottomAnchor.constraint(equalTo: superview.bottomAnchor).isActive = true
        }
    }
    
    public func anchorCenterXToSuperview(constant: CGFloat = 0) {
        translatesAutoresizingMaskIntoConstraints = false
        if let anchor = superview?.centerXAnchor {
            centerXAnchor.constraint(equalTo: anchor, constant: constant).isActive = true
        }
    }
    
    public func anchorCenterYToSuperview(constant: CGFloat = 0) {
        translatesAutoresizingMaskIntoConstraints = false
        if let anchor = superview?.centerYAnchor {
            centerYAnchor.constraint(equalTo: anchor, constant: constant).isActive = true
        }
    }
    
    public func anchorCenterSuperview() {
        anchorCenterXToSuperview()
        anchorCenterYToSuperview()
    }
}