Get the current first responder without using a private API

Question

I submitted my app a little over a week ago and got the dreaded rejection email today. It tells me that my app cannot be accepted because I\'m using a non-public API; specif

Answer 1

Simplest way to find first responder:

func sendAction(_ action: Selector, to target: Any?, from sender: Any?, for event: UIEvent?) -> Bool

The default implementation dispatches the action method to the given target object or, if no target is specified, to the first responder.

Next step:

extension UIResponder
{
    private weak static var first: UIResponder? = nil

    @objc
    private func firstResponderWhereYouAre(sender: AnyObject)
    {
        UIResponder.first = self
    }

    static var actualFirst: UIResponder?
    {
        UIApplication.shared.sendAction(#selector(findFirstResponder(sender:)), to: nil, from: nil, for: nil)
        return UIResponder.first
    }
}

Usage: Just get UIResponder.actualFirst for your own purposes.