How to blur an existing image in a UIImageView with Swift?

Question

The setup is simple.

• A ViewController with UIImageView that has an image assigned.
• A UIButton that when clicked blurs the image in the UIImageView.<

Answer 1

for those who ❤️ protocols

protocol Bluring {
    func addBlur(_ alpha: CGFloat)
}

extension Bluring where Self: UIView {
    func addBlur(_ alpha: CGFloat = 0.5) {
        // create effect
        let effect = UIBlurEffect(style: .dark)
        let effectView = UIVisualEffectView(effect: effect)

        // set boundry and alpha
        effectView.frame = self.bounds
        effectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        effectView.alpha = alpha

        self.addSubview(effectView)
    }
}

// Conformance
extension UIView: Bluring {}

// use
someImageview.addBlur()