Xcode – Crash tapping on UILabel – using UIApplication shared keyWindow rootViewController

I am fairly new to Swift, I am writing a plugin for a hybrid App (Cordova).

I managed to have the App rootController display a ViewController with a game inside and a separate UIView header at the top that contains a UILabel as a back button.

I am experiencing a crash as soon as I tap on the back button.
What am I doing wrong?

import SomeFramework;

@objc (MyIntegration) class MyIntegration : SomeFrameworkDelegate {
    func implementedFunctionForDelegate(_ controller: FwViewController) {
      print("fwViewControllerDidHandleSomeEvent");
    }
    // ...

    @objc(launchGame:)
    func launchGame() {
      // Prep params
      let params = FwLaunchParameters.init()
      params.gameId = gameId
      
      // ViewController init
      let gameController = FwViewController.init(gameLaunchParameters: params)
      gameController.delegate = self
      
      // Display game using rootViewController
      let currentWindow: UIWindow? = UIApplication.shared.keyWindow
      currentWindow?.rootViewController?.present(gameController, animated: true, completion: nil)

      let backHomeHeader = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 80.0))
      let label = UILabel(frame: CGRect(x: 0, y: 28, width: 200, height: 50))
      label.text = "u{3008} Back Home"
      label.isUserInteractionEnabled = true
      let gestureRecognizer = UITapGestureRecognizer(target: currentWindow?.rootViewController, action: Selector("handleTap"))
      label.addGestureRecognizer(gestureRecognizer)
      
      handleTap() // prints out the log as expected

      // Display header
      currentWindow?.addSubview(backHomeHeader)
      backHomeHeader.addSubview(label)
    }

    @objc func handleTap(_ sender: UITapGestureRecognizer? = nil) {
      print("tapped! yay!")
    }
}

Error log right before the crash:

2021-07-31 01:17:24.790750-0400 MyApp[53004:2197131] -[MainViewController handleTap]: unrecognized selector sent to instance 0x7fdb44906490
2021-07-31 01:17:24.842133-0400 MyApp[53004:2197131] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MainViewController handleTap]: unrecognized selector sent to instance 0x7fdb44906490'
*** First throw call stack:
(
    0   CoreFoundation                      0x00007fff20422fba __exceptionPreprocess + 242
    1   libobjc.A.dylib                     0x00007fff20193ff5 objc_exception_throw + 48

Note: I use UIApplication.shared.keyWindow because it’s a hybrid App (Cordova) and I’m writing a plugin that allows some Javascript code to launch an html5 game using Apple On-Demand Resources.

Everything works fine except for the Back Home button…