モーダルウィンドウをStoryboardで設定して、Delegateで値の受け渡しをする ref: http://qiita.com/matsuhisa@github/items/809c36fb766fb1049d4a

file0.swift

// storyboard で設定したViewを呼び出します
// - idで「second」を指定しています
// - SecondViewController というclassを別で作っています
var secondView:SecondViewController = self.storyboard!.instantiateViewControllerWithIdentifier("second") as SecondViewController

// 透過などが有効になるように設定
secondView.modalPresentationStyle = UIModalPresentationStyle.OverFullScreen

// モーダルウィンドウを呼び出します
self.presentViewController(secondView as UIViewController, animated: true, completion:nil)

file1.txt

secondView.modalPresentationStyle = UIModalPresentationStyle.OverFullScreen

file2.swift

//  SecondView.swift
//  TestAppInputForm02

import UIKit

class SecondViewController: UIViewController {

  override func viewDidLoad() {
    super.viewDidLoad()

    let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffectStyle.Dark))
    visualEffectView.frame = self.view.bounds
    self.view.backgroundColor = UIColor.clearColor()
    self.view.addSubview(visualEffectView)
    self.view.sendSubviewToBack(visualEffectView)

    // 以下略
  }

}

file3.swift

import UIKit

class SecondViewController: UIViewController {

  @IBOutlet weak var BackButton: UIButton!

  override func viewDidLoad() {
    super.viewDidLoad()
    // 戻る（閉じる）ボタン
    BackButton.addTarget(self, action: "backToMain:", forControlEvents: .TouchUpInside)
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }

  func backToMain(sender: AnyObject?) {
    self.dismissViewControllerAnimated(true, completion: nil);
  }
}

file4.swift

class ThirdViewController: UIViewController {
  @IBOutlet weak var AllCloseButton: UIButton!

  override func viewDidLoad() {
    super.viewDidLoad()

    // ボタンの設定
    AllCloseButton.addTarget(self, action: "allClose:", forControlEvents: .TouchUpInside)
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }

  func allClose(sender: AnyObject?) {
  UIApplication.sharedApplication().keyWindow.rootViewController?.dismissViewControllerAnimated(true, completion: nil)
  }
}

file5.swift

import UIKit

@objc protocol ModalViewDelegate {
  func saveText(textdata:String)
}

class ThirdViewController: UIViewController {

  var delegate:ModalViewDelegate! = nil

  @IBOutlet weak var InputTextThird: UIPlaceHolderTextView!
  @IBOutlet weak var SaveButton: UIButton!

  override func viewDidLoad() {
    super.viewDidLoad()

    // ボタンの設定
    SaveButton.addTarget(self, action: "saveSubmit:", forControlEvents: .TouchUpInside)

    // rootViewからdelegate を設定する
    var rootView  = UIApplication.sharedApplication().keyWindow.rootViewController as ViewController
    self.delegate = rootView
  }

  func allClose(sender: AnyObject?) {
    UIApplication.sharedApplication().keyWindow.rootViewController?.dismissViewControllerAnimated(true, completion: nil)
  }

  func saveSubmit(sender: AnyObject?) {

    var inputText:String = InputTextThird.text
    self.delegate.saveText(inputText)

    // 閉じる
    self.allClose(sender)
  }
}

file6.swift

import UIKit

class ViewController: UIViewController, ModalViewDelegate{

  override func viewDidLoad() {
    super.viewDidLoad()
  }

  func saveText(textdata:String){
    ImutView.text = textdata
  }
}

SecondView.swift

import UIKit

class SecondViewController: UIViewController {

  @IBOutlet weak var BackButton: UIButton!
  @IBOutlet weak var ToThirdViewBbutton: UIButton!

  override func viewDidLoad() {
    super.viewDidLoad()

    let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffectStyle.Dark))
    visualEffectView.frame = self.view.bounds
    self.view.backgroundColor = UIColor.clearColor()
    self.view.addSubview(visualEffectView)
    self.view.sendSubviewToBack(visualEffectView)

    BackButton.addTarget(self, action: "backToMain:", forControlEvents: .TouchUpInside)
    ToThirdViewBbutton.addTarget(self, action: "toThird:", forControlEvents: .TouchUpInside)
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }

  func backToMain(sender: AnyObject?) {
    self.dismissViewControllerAnimated(true, completion: nil);
  }

  func toThird(sender: AnyObject?) {
    var thirdView:AnyObject! = self.storyboard?.instantiateViewControllerWithIdentifier("third")
    self.presentViewController(thirdView as UIViewController, animated: true, completion:nil)
  }
}

ThirdView.swift

import UIKit

@objc protocol ModalViewDelegate {
  func saveText(textdata:String)
}

class ThirdViewController: UIViewController {

  var delegate:ModalViewDelegate! = nil

  @IBOutlet weak var ThisCloseButton: UIButton!
  @IBOutlet weak var AllCloseButton: UIButton!
  @IBOutlet weak var InputTextThird: UIPlaceHolderTextView!
  @IBOutlet weak var SaveButton: UIButton!

  override func viewDidLoad() {
    super.viewDidLoad()

    // TextViewの設定
    InputTextThird.placeHolder = "3枚目のViewです。ここに本文を書き、1枚目に送ります"

    // ボタンの設定
    ThisCloseButton.addTarget(self, action: "backToMain:", forControlEvents: .TouchUpInside)
    AllCloseButton.addTarget(self, action: "allClose:", forControlEvents: .TouchUpInside)
    SaveButton.addTarget(self, action: "saveSubmit:", forControlEvents: .TouchUpInside)

    // rootViewからdelegate を設定する
    var rootView  = UIApplication.sharedApplication().keyWindow.rootViewController as ViewController
    self.delegate = rootView
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }

  func backToMain(sender: AnyObject?) {
    self.dismissViewControllerAnimated(true, completion: nil);
  }

  func allClose(sender: AnyObject?) {
    UIApplication.sharedApplication().keyWindow.rootViewController?.dismissViewControllerAnimated(true, completion: nil)
  }

  func saveSubmit(sender: AnyObject?) {

    var inputText:String = InputTextThird.text
    self.delegate.saveText(inputText)

    // 閉じる
    self.allClose(sender)
  }
}

ViewController.swift

import UIKit

class ViewController: UIViewController, ModalViewDelegate{

  @IBOutlet weak var TestWebView: UIWebView!
  @IBOutlet weak var ImutView: UIPlaceHolderTextView!
  @IBOutlet weak var SaveButton: UIButton!


  override func viewDidLoad() {
    super.viewDidLoad()

    // TextViewの設定
    ImutView.placeHolder = "本文です。"
    ImutView.placeHolderColor = UIColor(red: 255, green: 0, blue: 0, alpha: 0.5)

    // ボタンの設定
    SaveButton.addTarget(self, action: "click:", forControlEvents: .TouchUpInside)
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }

  func click(sender: AnyObject?) {
    var secondView:SecondViewController = self.storyboard!.instantiateViewControllerWithIdentifier("second") as SecondViewController

    secondView.modalPresentationStyle = UIModalPresentationStyle.OverFullScreen

    self.presentViewController(secondView as UIViewController, animated: true, completion:nil)
  }

  func saveText(textdata:String){
    ImutView.text = textdata
  }
}