Q:

Unrecognized selector sent to instance for my tap gesture

I have the following code
lazy private var _containerView: UIView = {
    let view = UIView(frame: self.view.frame)
    let tapGesture = UITapGestureRecognizer(
        target: self,
        action: Selector(("didtapContainerView:"))
    )
    view.translatesAutoresizingMaskIntoConstraints = false
    view.backgroundColor = UIColor(white: 0.0, alpha: 0)
    view.addGestureRecognizer(tapGesture)
    tapGesture.delegate = self
    return view
}()

and this is the method
@objc final func didtapContainerView(gesture: UITapGestureRecognizer) {
    setDrawerState(state: .Closed, animated: true)
}

and I am getting this error

Forsa.KYDrawerController didtapContainerView]: unrecognized selector sent to instance

A:

You don't know how to make the correct selector for this method. (It would be "didtapContainerViewWithGesture:", but clearly you don't know that.)
So don't try. Use #selector syntax and let the compiler form the selector for you!
Just say #selector(didtapContainerView). Done. 

