How do I animate opacity using swift?

Question

Could someone please provide me with an example of animating the opacity of an Image View in swift??

I couldn\'t even find a good example in objective c

Answer 1

You can use this extension method (unless you want to modify the view's attributes itself):

extension CALayer {

    func flash(duration: TimeInterval) -> Observable {
        let flash = CABasicAnimation(keyPath: "opacity")

        flash.fromValue = NSNumber(value: 0)
        flash.toValue = NSNumber(value: 1)
        flash.duration = duration
        flash.autoreverses = true

        removeAnimation(forKey: "flashAnimation")
        add(flash, forKey: "flashAnimation")
        opacity = 0     // Change the actual data value in the layer to the final value
    }
}