Alert Controller in swift

one Button
let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: 

two buttons

// create the alert
let alert = UIAlertController(title: "UIAlertController", message: "Would you like to continue learning how to use iOS alerts?", preferredStyle: UIAlertControllerStyle.alert)

// add the actions (buttons)
alert.addAction(UIAlertAction(title: "Continue", style: UIAlertActionStyle.default, handler: nil))
alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel, handler: nil))

// show the alert
self.present(alert, animated: true, completion: nil)

three buttons

let alert = UIAlertController(title: "Notice", message: "Lauching this missile will destroy the entire universe. Is this what you intended to do?", preferredStyle: UIAlertControllerStyle.alert)

// add the actions (buttons)
alert.addAction(UIAlertAction(title: "Remind Me Tomorrow", style: UIAlertActionStyle.default, handler: nil))
alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel, handler: nil))
alert.addAction(UIAlertAction(title: "Launch the Missile", style: UIAlertActionStyle.destructive, handler: nil))

// show the alert
self.present(alert, animated: true, completion: nil)

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