ViewController.swift

class ViewController: UIViewController, ConstraintStateMachineType {
    typealias State = Alignment
    enum Alignment: String {
        case Left = "Left"
        case Right = "Right"
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(UInt64(2) * NSEC_PER_SEC)), dispatch_get_main_queue()) { () -> Void in
            self.state = .Right
        }
    }
}