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Swiftコードで画面遷移

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storyboardを使いたくなかったのでコーディング。
遷移の管理はナビゲーションバーを使用する。

AppDelegate.swift
...
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
  // トップ画面のコントローラ
  let first = FirstViewController()
  // ナビゲーションバーのコントローラ
  let navi = UINavigationController(rootViewController: first as UIViewController)
  // 今回はスワイプでバックする機能は無効化しておく
  navi.interactivePopGestureRecognizer?.enabled = false

  window = UIWindow(frame: UIScreen.mainScreen().bounds)
  window?.rootViewController = navi
  window?.makeKeyAndVisible()

  return true
}
...
FirstViewController.swift
...
override func viewDidLoad() {
  // ナビゲーションバーの設定
  navigationController?.navigationBar.backgrondColor = UIColor.grayColor()
  navigationController?.setNavigationBarHidden(false, animated: false)
  // 遷移先でナビゲーションバーに戻るボタンを表示させない
  navigationItem.setHidesBackButton(true, animated: false)

  // 次へ進むボタン
  let button = UIButton(frame: CGRectMake(0, 0, view.bounds.width / 2, view.bounds.height / 2))
  button.layer.cornerRadius = 10
  button.layer.position = view.center
  // ボタンを押した(離した)際のイベントを登録
  button.addTarget(self, action: "goSecond:", forControlEvents: .TouchUpInside)
  view.addSubview(button)
}

func goSecond(sender: UIButton) {
  let second = SecondViewController()
  next.modalTransitionStyle = .CrossDissolve
  // 変数に任意の値を渡せる
  next.myMessasge = "トップ画面からの遷移" 
  // 画像データも渡せるので、撮影した画像をアルバムに保存しなくて良い
  next.myImage = UIImage(...)
  // 遷移履歴に追加する形で画面遷移
  navigationController?.pushViewController(second as UIViewController, animated: true)
}
...
SecondViewController.swift
// 省略
ThirdViewController.swift
...
func goFirst(sender: UIButton) {
  let first = FirstViewController()
  top.modalTransitionStyle = .CrossDissolve
  // 遷移履歴は First -> Second -> Third -> First となる
  navigationController?.pushViewController(first as UIViewController, animated: true)
}

func backOne(sender: UIButton) {
  // 遷移履歴を一つ戻る
  // 一度戻ると再び進むことはできないので注意
  navigationController?.popViewControllerAnimated(true)
}

func backTwo(sender: UIButton) {
  // 遷移履歴を二つ戻る
  let count = navigationController!.viewControllers.count - 3
  let target = navigationController!.viewControllers[count]
  target.modalTransitionStyle = .CrossDissolve
  navigationController?.popToViewController(target as UIViewController, animated: true)
}

func backRoot(sender: UIButton) {
  // 遷移履歴の最初に戻る
  navigationController?.popToRootViewControllerAnimated(true)
}
...

ナビゲーションバーを使うとその分画面がずれたりずれなかったり、
調整が面倒なのだがそれはまた別の話。

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