Keyboard like in WhatsApp

I’m trying to implement a WhatsApp like messenger functionality, and ran into troubles with the keyboard. When I click on the input text area, the keyboard will move the whole App by the amount the keyboard opens. If I use the following code to disable scroll functionality, then my input text area field gets hidden behind the keyboard.

What I want is to disable the Scroll but have the input text area move up together with the Keyboard. Does anyone know how to cleverly solve this problem? Many thanks!!

        platforms : {
          ios : {
            scrollAssist: false,  
            autoFocusAssist: false