[ios] Programmatically create a UIView with color gradient

I have implemented this in swift with an extension:

Swift 3

extension UIView {
    func addGradientWithColor(color: UIColor) {
        let gradient = CAGradientLayer()
        gradient.frame = self.bounds
        gradient.colors = [UIColor.clear.cgColor, color.cgColor]

        self.layer.insertSublayer(gradient, at: 0)
    }
}

Swift 2.2

extension UIView {
    func addGradientWithColor(color: UIColor) {
        let gradient = CAGradientLayer()
        gradient.frame = self.bounds
        gradient.colors = [UIColor.clearColor().CGColor, color.CGColor]

        self.layer.insertSublayer(gradient, atIndex: 0)
    }
}

No I can set a gradient on every view like this:

myImageView.addGradientWithColor(UIColor.blue)

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