Swift workaround to solve delay in assigning first UITextField responder in UIKit and erroneous responders

workaround.swift

// Add this function to the end of AppDelegate.swift
// Call this function in 
// func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool
func applyFirstResponder() {
  let dummyField = UITextField()
  self.window?.addSubView(dummyField)
  dummyField.becomeFirstResponder()
  dummyField.resignFirstResponder()
  dummyField.removeFromSuperview()
}