Input view rendered incorrectly when NMessengerViewController is inside UITabBarController

[dodikk]

There should be no whitespace between the keyboard prompt and the input field.

[dodikk]

Here is a fix of the NMessengerViewController class.
I'll file a pull request later.

    func keyboardNotification(_ notification: Notification)
    {
        if let userInfo = (notification as NSNotification).userInfo
        {
            let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
            let duration:TimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
            let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber
            let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIViewAnimationOptions().rawValue
            let animationCurve:UIViewAnimationOptions = UIViewAnimationOptions(rawValue: animationCurveRaw)
            
            
            let newKeyboardLocation = endFrame
            let keyboardHeight = newKeyboardLocation?.size.height ?? 0
            let inputBarHeight = inputBarView.frame.height
            
            let isInsideTabBar = (nil != self.tabBarController)
            let tabBarHeight = self.tabBarController?.tabBar.frame.size.height ?? 0
            
            let isKeyboardOffScreen =
                (newKeyboardLocation?.origin.y >= UIScreen.main.bounds.size.height)
            
            let inputViewShiftOffsetY = keyboardHeight - tabBarHeight
            
            if (isKeyboardOffScreen)
            {
                self.inputBarBottomSpacing.constant = 0
                /*let bottomInset*/ _ = inputBarView.frame.height
                self.isKeyboardIsShown = false
            }
            else
            {
                let isInputBarHasNoBottomSpacing = (self.inputBarBottomSpacing.constant == 0)
                
                if (isInputBarHasNoBottomSpacing)
                {
                    self.inputBarBottomSpacing.constant -= inputViewShiftOffsetY
                    /*let bottomInset*/ _ = inputViewShiftOffsetY + inputBarHeight
                }
                else
                {
                    self.inputBarBottomSpacing.constant = 0
                    self.inputBarBottomSpacing.constant -= inputViewShiftOffsetY
                    /*let bottomInset*/ _ = inputViewShiftOffsetY + inputBarHeight
                }
                self.isKeyboardIsShown = true
            }
            
            let animationsBlock: () -> Swift.Void =
            {
                self.view.layoutIfNeeded()
                if self.isKeyboardIsShown
                {
                    self.messengerView.scrollToLastMessage(animated: true)
                }
            }
            
            let noDelay: TimeInterval = 0
            UIView.animate(withDuration: duration,
                                  delay: noDelay,
                                options: animationCurve,
                             animations: animationsBlock,
                             completion: nil)
            
        }
    }

[dodikk]

Fixed #123