How can I set the UINavigationbar with gradient color?

Question

I want to set the UINavigationbar backgroundColor to a gradient color where I would like to set it via an array of colors to create a Gradient, ide

Answer 1

For Swift 4.2

extension UINavigationBar {
    func setGradientBackground(colors: [Any]) {
        let gradient: CAGradientLayer = CAGradientLayer()
        gradient.locations = [0.0 , 0.5, 1.0]
        gradient.startPoint = CGPoint(x: 0.0, y: 1.0)
        gradient.endPoint = CGPoint(x: 1.0, y: 1.0)

        var updatedFrame = self.bounds
        updatedFrame.size.height += self.frame.origin.y
        gradient.frame = updatedFrame
        gradient.colors = colors;
        self.setBackgroundImage(self.image(fromLayer: gradient), for: .default)
    }

    func image(fromLayer layer: CALayer) -> UIImage {
        UIGraphicsBeginImageContext(layer.frame.size)
        layer.render(in: UIGraphicsGetCurrentContext()!)
        let outputImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return outputImage!
    }
}

How to use

   self.navigationController?.navigationBar.setGradientBackground(colors: [
            UIColor.red.cgColor,
            UIColor.green.cgColor,
            UIColor.blue.cgColor
            ])