tomkowz

        let views = ["v1": v1, "super": self.view]
        self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:[super]-(<=0)-[v1(50)]", options: .AlignAllCenterY, metrics: nil, views: views))
        self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[super]-(<=0)-[v1(100)]", options: .AlignAllCenterX, metrics: nil, views: views))

tomkowz

class LetItGoTableViewController: UITableViewController {
    
    private enum SignInField: Int {
        case Username
        case Password
        case RememberMe
        case SignInButton
    }
    
    // MARK: - Table view data source

tomkowz

struct Position {
    var x: Int = 0
    var y: Int = 0
    
    func string() -> String {
        return "(\(x), \(y))"
    }
}

// CustomStringConvertible provides "description" property. 

tomkowz

enum GameState {
    case NotStarted
    case InPlay
    case GameWon
    case PlayingForHigherScores
    case GameLost
    
    func simpleDescription(state: GameState) -> String {
        switch state {
        case .NotStarted:

tomkowz

//
//  main.cpp
//  ctci-3-3
//
//  Created by Tomasz Szulc on 14/07/15.
//  Copyright (c) 2015 Tomasz Szulc. All rights reserved.
//

#include <iostream>

tomkowz

class MessageControl: UIView {

    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var actionButton: UIButton!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        self.actionButton.enabled = false
    }
    

tomkowz

override func awakeAfterUsingCoder(aDecoder: NSCoder) -> AnyObject? {
    if self.subviews.count == 0 {
        let nib = UINib(nibName: "MessageControl", bundle: nil)
        let view = nib.instantiateWithOwner(nil, options: nil).first! as MessageControl
        view.setTranslatesAutoresizingMaskIntoConstraints(false)
        return view
    }
        
    return self
}

tomkowz

class ViewController: UIViewController {
   /// outlet for the control may be here if used
}

tomkowz

class ViewController: UIViewController {
    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var actionButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.actionButton.enabled = false
    }
    
    @IBAction func onActionPressed(sender: AnyObject) {

tomkowz

    enum SegueIdentifier: String {
        case ToRed = "Red"
        case ToGreen = "Green"
        case ToBlue = "Blue"
        
         init?(_ rawValue: String?) {
            let out = SegueIdentifier(rawValue: rawValue ?? "")
            if rawValue != nil && out != nil {
                self = out!
            } else {