How to create a Custom Dialog box on iOS App using Swift?

To create a dialog box in swift we’ll make use of UIAlertController which is an important part of UIKit. We’ll do this with help of an iOS application and a sample project.

First of all, we’ll create an empty project, then inside its default view controller, we’ll perform the following operations.

We’ll create an UIAlertController object.

let alert = UIAlertController.init(title: title, message: description, preferredStyle: .alert)

We’ll create an action

let okAction = UIAlertAction.init(title: "Ok", style: .default) { _ in
   print("You tapped ok")
   //custom action here.
}

We’ll add the action to the alert and present it

alert.addAction(okAction)
self.present(alert, animated: true, completion: nil)

Now we’ll convert this to a function −

func createAlert(withTitle title:String,andDescription description: String) {
   let alert = UIAlertController.init(title: title, message: description, preferredStyle: .alert)
   let okAction = UIAlertAction.init(title: "Ok", style: .default) {
       _ in print("You tapped ok")
      //custom action here.
   }
   alert.addAction(okAction)
   self.present(alert, animated: true, completion: nil)
}

we’ll now call the function in our viewWillLayoutSubviews method, and this is how it looks when we run this on a device.

override func viewWillLayoutSubviews() {
   self.createAlert(withTitle: "This is an alert", andDescription: "Enter your description here.")
}

This produces the result as shown below.