@IBAction func SkipAction(sender: AnyObject) {

    let defaults = NSUserDefaults.standardUserDefaults()
    defaults.setBool(true, forKey: "tuto")
    defaults.synchronize()

    let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("SecondViewController") as?
    SecondViewController
    //This showcontroller is too low, extremely low to show secondVieController
    self.showViewController(viewController!, sender: self)
}

import UIKit

class SecondViewController: UIViewController, UITextFieldDelegate {

var kbHeight: CGFloat!

@IBOutlet var txtUsername: UITextField!
@IBOutlet var txtEmail: UITextField!
@IBOutlet var txtPassword: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()
    self.txtUsername.delegate = self
    self.txtEmail.delegate = self
    self.txtPassword.delegate = self

    let tapgestures = UITapGestureRecognizer(target: self, action: #selector(RegistroViewController.hiddenKeyboard))
    self.view.addGestureRecognizer(tapgestures)
}

...

func hiddenKeyboard(){
    self.txtUsername.resignFirstResponder()
    self.txtPassword.resignFirstResponder()
    self.txtEmail.resignFirstResponder()
}

@IBAction func RegisterAction(sender: AnyObject) {

    var fields: [String] = [self.txtUsername.text!, self.txtEmail.text!, self.txtPassword.text!, "IOS"]

    //In this secction the app will connect to webservice to register data but in this moment is deactivated

    let defaults = NSUserDefaults.standardUserDefaults()

    if self.txtUsername.text == "x" && self.txtEmail.text == "x" && self.txtPassword.text == "x"
    {

        //not logged in
    }
    else
    {
        //if logged in
        defaults.setObject("(self.txtEmail.text)(self.txtPassword.text)", forKey: "user")
        defaults.setBool(true, forKey: "reg")
        defaults.setObject(self.txtUsername.text, forKey: "name")
        defaults.setObject(self.txtEmail.text, forKey: "mail")
        defaults.setBool(true, forKey: "loginSuccess")
        defaults.synchronize()

        let alert = UIAlertController(title: "Alert", message: "Success", preferredStyle: UIAlertControllerStyle.Alert)
        let action = UIAlertAction(title: "Accept", style: UIAlertActionStyle.Default) { action  in

            let viewController = (self.storyboard?.instantiateViewControllerWithIdentifier("AnotherViewController"))! as UIViewController
            //This  showViewController works very fast when is required
            self.showViewController(viewController, sender: self)
        }
        alert.addAction(action)
        self.presentViewController(alert, animated: true, completion: nil)
    }

}

...

// MARK: - Hide Keyboard delegate

func textFieldShouldReturn(textField: UITextField) -> Bool {
    self.hiddenKeyboard()
    return true
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(RegistroViewController.keyboardWillShow(_:)), name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(RegistroViewController.keyboardWillHide(_:)), name: UIKeyboardWillHideNotification, object: nil)
}

override func viewWillDisappear(animated: Bool) {
    super.viewWillDisappear(animated)

    NSNotificationCenter.defaultCenter().removeObserver(self)
}

func keyboardWillShow(notification: NSNotification) {
    if let userInfo = notification.userInfo {
        if let keyboardSize =  (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
            kbHeight = keyboardSize.height - 100.0
            self.animateTextField(true)
        }
    }
}
func keyboardWillHide(notification: NSNotification) {
    self.animateTextField(false)
}

func animateTextField(up: Bool) {
    let movement = (up ? -kbHeight : kbHeight)

    UIView.animateWithDuration(0.3, animations: {
        self.view.frame = CGRectOffset(self.view.frame, 0, movement)
    })
}