This is the extension of UIView to add easily a UiTapGestureRecognizer to uiimageview:

extension UIView {

    fileprivate struct AssociatedObjectKeys {
        static var tapGestureRecognizer = "MediaViewerAssociatedObjectKey_mediaViewer"
    }

    fileprivate typealias Action = (() -> Void)?

    fileprivate var tapGestureRecognizerAction: Action? {
        set {
            if let newValue = newValue {
                // Computed properties get stored as associated objects
                objc_setAssociatedObject(self, &AssociatedObjectKeys.tapGestureRecognizer, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN) //Forming 'UnsafeRawPointer' to an inout variable of type String exposes the internal representation rather than the string contents.
            }
        }
        get {
            let tapGestureRecognizerActionInstance = objc_getAssociatedObject(self, &AssociatedObjectKeys.tapGestureRecognizer) as? Action //Forming 'UnsafeRawPointer' to an inout variable of type String exposes the internal representation rather than the string contents.
            return tapGestureRecognizerActionInstance
        }
    }

    public func addTapGestureRecognizer(action: (() -> Void)?) {
        self.isUserInteractionEnabled = true
        self.tapGestureRecognizerAction = action
        let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleTapGesture))
        self.addGestureRecognizer(tapGestureRecognizer)
    }

    @objc fileprivate func handleTapGesture(sender: UITapGestureRecognizer) {
        if let action = self.tapGestureRecognizerAction {
            action?()
        } else {
            print("no action")
        }
    }
}

But xcode tells me this twice for the set and the get methods: Forming ‘UnsafeRawPointer’ to an inout variable of type String exposes the internal representation rather than the string contents.

What do i have to do to silent it?
I notice that the code works but with this 2 warnings.
Thank u