@IBAction func addButtonPressed(_ sender: UIButton) {
  let url = URL(string: "MyAppName://")!

  extensionContext?.open(url) { isSuccess in
    switch isSuccess {
    case true: print("Open URL Success") // It print when opening app
    case false: print("Open URL Failed")
    }
  }
}

// This delegate function is never call when the host application lauching
func application(_ app: UIApplication, // break point not work
               open url: URL,
               options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

  print("FUNCTION CALLED 😠😠😠") // Never print

  return true
}