Segues using enums in Swift

gistfile1.swift

extension UIViewController {
  func performSegue<T:RawRepresentable where T.RawValue==String>(identifier: T, sender: AnyObject?) 
    self.performSegueWithIdentifier(identifier.rawValue, sender: sender)
  }
}

gistfile2.txt

class MyViewController: UIViewController {
  enum Segue: String {
    case GoThere     = "go-via-this-segue"
    case GoSomewhere = "go-via-that-segue"
  }
  
  @IBAction func clickButton(sender: UIButton) {
    self.performSegue(Segue.GoThere, sender: self)
  }
}