t Change UIButton Text Based on User Input - swift

Question

I have a button on my UINavigationBar which I have created using this code:
let inputLabel = UIBarButtonItem(title: userInput, style: .plain, target: self, action: #selector(inputLabelButtonTapped))
I want to make the inputLabel.text based on what the user inputs. Here is what I imagine the inputLabelButtonTapped function to look like, but I cannot code it:
inputLabelButtonTapped() {
// Have a keyboard/numberpad appear on the screen
// Save the what the user types on the screen to a newUserInputVariable
// Make the inputLabel.text = newUserInputVariable
}
Thanks in advance.

Answer 1

You seem to have a mismatch in UIBarButtonItem and UILabel. The former is a button that can be positioned in a UINavigationController or UITabBarController. The latter just displays text.
Instantiate an input field either by adding a UITextField or an UIAlertViewController to the ViewController:
var barButtonItemTitle = String()
// create the alert controller
let ac = UIAlertController(title:"<SomeName>",
message: "<SomeMessage>",
preferredStyle: UIAlertControllerStyle.alert)
Add an UIAlertAction to the UIAlertViewController with a completion handler that will allow you to update the property for barButtonItemTitle
let action = UIAlertAction(title: "OK", style: .default) { _ in
//Add a textfield to the alert controller:
ac.addTextField
when you add a UITextField to a UIAlertController it will appear in an [TextFields] if it exists.
// Unwrap the textfield array and the first item there and access the text property.
guard let inputText = ac.textFields?.first?.text else {return}
Set the barButtonText property to the text that was pulled out
barButtonText = inputText
}
// Add action to the controller & present the view.
ac.addAction(action)
present(ac, animated: true)
Once the barButtonText is updated with new values, you can use that property to create an instance of UIBarButtonItem and place it where ever.
let barButton = UIBarButtonItem(title: barButtonText, style: .plain, target: nil, action: nil)
You can wrap all that into a func that is assigned to your view