InstantiateViewController doesn't load the @IBOutlet

Question

I have two views. The first one has a UITextView and a button. The second has a UILabel. When I click on the button I would like the text label of the second views to be filled with what was in the textfield of the first view.

I did the following:

@IBAction func tapButton() {
    let vc = storyboard?.instantiateViewController(identifier: "second") as! SViewController
    vc.l.text = t.text
    vc.modalPresentationStyle = .fullScreen
    present(vc, animated: true)
}

l is the UILabel and t is the UITextField. When I run this code it's telling me I am trying to unwrapped l whereas l is nil.

But why l is nil? I mean if I instantiate my second view then it should create the UILabel l and thus l is not nil?

Check this out: https://stackoverflow.com/a/29322364/14351818 — aheze, Apr 30 '21 at 22:32

score 0 · Accepted Answer · answered May 01 '21 at 04:53

This happens because your second view controller's view hierarchy hasn't loaded yet, that's why you're getting nil. Simple solution is to keep a string variable in the second view controller and set it in the button tap action. And then in viewDidLoad of the second view controller set the label text.

InstantiateViewController doesn't load the @IBOutlet

1 Answers1