How to display alert message in Swift 3

To display the Alert message in your Swift 3 application you can use the following code
I am using UIAlertController to show the message

let msg : String="How are you?"
        
let alert = UIAlertController(title: "Hello", message: msg, preferredStyle: UIAlertControllerStyle.alert)
self.present(alert, animated: true, completion: nil)

You can see the following alert window for the above code

If you want to add “OK” button for the alert window you can use the following code

let alert = UIAlertController(title: "Hello", message: msg, preferredStyle: UIAlertControllerStyle.alert)
// add OK button
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)

You will get the following alert window with “Ok” button