Blättern Sie UITextView, wenn die Tastatur erscheint in swift

Das problem, das ich bin vor ist jetzt, dass es ein UITextField in UIScrollView.
Wenn ich Klicks das UITextField, zeige ich UIPickerView mit UIToolBar. Ich brauche zu bewegen UITextField zu, wenn PickerView präsentiert.

Hier ist mein design

Hier ist mein code

 func keyboardWillShow(notification: NSNotification)
{
    let userInfo = notification.userInfo
    if let info = userInfo
    {
        let animationDurationObject =
        info[UIKeyboardAnimationDurationUserInfoKey] as NSValue

        let keyboardEndRectObject =
        info[UIKeyboardFrameEndUserInfoKey] as NSValue

        var animationDuration = 0.0
        var keyboardEndRect = CGRectZero

        animationDurationObject.getValue(&animationDuration)
        keyboardEndRectObject.getValue(&keyboardEndRect)

        let window = UIApplication.sharedApplication().keyWindow

        keyboardEndRect = view.convertRect(keyboardEndRect, fromView: window)

        let intersectionOfKeyboardRectAndWindowRect =
        CGRectIntersection(view.frame, keyboardEndRect);

        UIView.animateWithDuration(animationDuration, animations: {[weak self] in

            self!.scrollView.contentInset = UIEdgeInsets(top: 0,
                left: 0,
                bottom: intersectionOfKeyboardRectAndWindowRect.size.height,
                right: 0)
            self?.scrollView.scrollRectToVisible(self!.activeTextField.frame, animated: true)
        })
    }
}

func keyboardWillHide(notification: NSNotification)
{
    let userInfo = notification.userInfo

    if let info = userInfo{
        let animationDurationObject =
        info[UIKeyboardAnimationDurationUserInfoKey]
            as NSValue

        var animationDuration = 0.0;

        animationDurationObject.getValue(&animationDuration)

        UIView.animateWithDuration(animationDuration, animations: {
            [weak self] in
            self?.scrollView.contentInset = UIEdgeInsetsZero
            self?.scrollView.scrollIndicatorInsets = UIEdgeInsetsZero
        })
    }
}

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

func textFieldShouldBeginEditing(textField: UITextField) -> Bool
{
    var returnVal = true
    self.activeTextField = textField
    if textField == self.pickerTextField
    {
        returnVal = false
        var yval:CGFloat = self.view.bounds.size.height - 206
        self.pickerContainerView.frame = CGRectMake(0, yval, self.view.bounds.size.width, self.pickerContainerView.frame.size.height)
        self.pickerContainerView.hidden = false
        self.view.addSubview(self.pickerContainerView)
    }
    return returnVal
}

func textFieldDidEndEditing(textField: UITextField) {
    self.activeTextField = nil
    textField.resignFirstResponder()
}

Wenn ich auf anderen Feldern, denen TextField geht, wenn die Tastatur präsentiert. Aber was ist zu tun bei PickerTextField

Ideen für UItextView zu

Dank.