uialertcontroller.swift

// Declaring UIAlertController

var alert = UIAlertController(title: "Welcome!", message: "You logged in!", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Continue", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)

// Handling UIAlertController Actions
alert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { action in
  switch action.style{
    case .Default:
    println("default")
    break
    
    case .Cancel:
    println("cancel")
    break
    
    case .Destructive:
    println("destructive")
    break
  }
}))