Extension of UIViewController to implement all UITextField Dismiss and control features

Question

In Android Keyboard controls are in built,
But Ios Swift, really dono why we need so much to code.

I wannu implement following all together :
* Dismiss keyboard on tapping elsewhere
* Move View abv wen TextField is behind keyboard
* Implement Next feature, if next text field is available

I tried as below, which is not working :

extension UIViewController : UITextFieldDelegate
{
    var VydTxtBoxVar: UITextField {get{return self.VydTxtBoxVar} set{}}
    var ChkKeyPadDspVar: Bool {get{return self.ChkKeyPadDspVar} set{}}
    var KeyPadHytVal: CGFloat {get{return self.KeyPadHytVal} set{}}

    public func StrWenviewWillAppear()
    {
        NSNotificationCenter.defaultCenter().addObserver(self,
                                                         selector: #selector(TdoWenKeyPadVyd(_:)),
                                                         name:UIKeyboardWillShowNotification,
                                                         object: nil);
        NSNotificationCenter.defaultCenter().addObserver(self,
                                                         selector: #selector(TdoWenKeyPadHyd(_:)),
                                                         name:UIKeyboardWillHideNotification,
                                                         object: nil);
    }

    public func textFieldDidBeginEditing(TxtBoxPsgVar: UITextField)
    {
        self.VydTxtBoxVar = TxtBoxPsgVar
    }

    public func textFieldDidEndEditing(TxtBoxPsgVar: UITextField)
    {
        self.VydTxtBoxVar = UITextField()
    }

    public func textFieldShouldReturn(TxtBoxPsgVar: UITextField) -> Bool
    {
        self.VydTxtBoxVar.resignFirstResponder()
        return true
    }

    override public func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
    {
        view.endEditing(true)
        super.touchesBegan(touches, withEvent: event)
    }

    public func TdoWenKeyPadVyd(NfnPsgVar: NSNotification)
    {
        if(!self.ChkKeyPadDspVar)
        {
            self.KeyPadHytVal = ((NfnPsgVar.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().height)!

            var NonKeyPadAraVar: CGRect = self.view.frame
            NonKeyPadAraVar.size.height -= self.KeyPadHytVal

            let VydTxtBoxCenVal: CGPoint? = VydTxtBoxVar.frame.origin

            if (!CGRectContainsPoint(NonKeyPadAraVar, VydTxtBoxCenVal!))
            {
                self.ChkKeyPadDspVar = true
                UIView.animateWithDuration(1.0,
                                           animations:
                    { self.view.frame.origin.y -= (self.KeyPadHytVal)},
                                           completion: nil)
            }
            else
            {
                self.ChkKeyPadDspVar = false
            }
        }

    }

    public func TdoWenKeyPadHyd(NfnPsgVar: NSNotification)
    {
        if (self.ChkKeyPadDspVar)
        {
            self.ChkKeyPadDspVar = false
            UIView.animateWithDuration(1.0,
                                       animations:
                { self.view.frame.origin.y += (self.KeyPadHytVal)},
                                       completion: nil)
        }
    }

    public func StpWenviewDidDisappear()
    {
        NSNotificationCenter.defaultCenter().removeObserver(self)
        view.endEditing(true)
        ChkKeyPadDspVar = false
    }
}