becomeFirstResponder hide the hint

[walteryaron]

when using
override func viewDidLoad() {
super.viewDidLoad()
_ = hintTextField.becomeFirstResponder()
}
hint doesn't showing
to solve it I use
DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
_ = hintTextField.becomeFirstResponder()
}
but it doesn't look good when you push new screen