Animate cell when pressed using Swift 3

Question

My problem is really simple. I would like to animate a cell within a collectionView. Indeed, I would like to show a grey background behind the cell and scale down the image

Answer 1

Swift 4.2, inside the UICollectionViewCell

    //MARK:- Events
    override func touchesBegan(_ touches: Set, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        animate(isHighlighted: true)
    }

    override func touchesEnded(_ touches: Set, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)
        animate(isHighlighted: false)
    }

    override func touchesCancelled(_ touches: Set, with event: UIEvent?) {
        super.touchesCancelled(touches, with: event)
        animate(isHighlighted: false)
    }

    //MARK:- Private functions
    private func animate(isHighlighted: Bool, completion: ((Bool) -> Void)?=nil) {
        let animationOptions: UIView.AnimationOptions = [.allowUserInteraction]
        if isHighlighted {
            UIView.animate(withDuration: 0.5,
                           delay: 0,
                           usingSpringWithDamping: 1,
                           initialSpringVelocity: 0,
                           options: animationOptions, animations: {
                            self.transform = .init(scaleX: 0.96, y: 0.96)
            }, completion: completion)
        } else {
            UIView.animate(withDuration: 0.5,
                           delay: 0,
                           usingSpringWithDamping: 1,
                           initialSpringVelocity: 0,
                           options: animationOptions, animations: {
                            self.transform = .identity
            }, completion: completion)
        }
    }