waits until the user finishes responding to the popup dialog in Swift - swift2

Question

I want the user to type up the text in the pop up dialog, but I want the program to wait until the user finished writing the text in the pop up dialog

Answer 1

Use UIAlertController:
let alertController = UIAlertController(title: "title", message: nil, preferredStyle: .Alert)
alertController.addTextFieldWithConfigurationHandler { (textField) -> Void in }
alertController.addAction(UIAlertAction(title: "cancel", style: UIAlertActionStyle.Cancel, handler: nil))
logInAlertController.addAction(UIAlertAction(title: "go", style: UIAlertActionStyle.Default, handler: { (action) -> Void in }

Answer 2

Swift 4
It sounds like you are doing your completion handling when presenting the controller instead of when the user selects an alert action.
You'll want to try something like this:
import UIKit
class MyViewController: UIViewController
{
var someStringVariable:String = ""
func presentAnAlert()
{
let alert = UIAlertController(
title: "Title",
message: "Message",
preferredStyle: .actionSheet //choose which style you prefer
)
alert.addTextField()
{ (textField) in
//this is for configuring the text field the user will see
textField.borderStyle = UITextField.BorderStyle.bezel
}
alert.addAction(UIAlertAction(title: "OK", style: .default)
{ action in
//use this space to transfer any data
let textField = alert.textFields![0]
self.someStringVariable = textField.text ?? ""
})
self.present(alert, animated: true)
{
//this will run once the action of **presenting** the view
//is complete, rather than when the presented view has been
//dismissed
}
}
override viewDidLoad()
{
super.viewDidLoad()
self.presentAnAlert()
print(self.someStringVariable)
//prints whatever the user input before pressing the OK button
}
}
I hope that helped!