Issue with the message field


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I have a message field as below. I touch the screen  for some seconds  in order to scroll inside the message field. 

The moment I move my finger there should be no effect. However, I can see that the moment I remove my finger the keyboard pops up, which shouldn't IMO.

How to apply both a stack navigator and a tab navigator to a screen?

So, I have been trying to apply both a stack navigator and a tab navigator to a screen. What I try to do is this (two cases):


stack navigator (=root)
        tab navigator
                screen

  2. 

 stack navigator (=root)
        screen
        tab navigator
                screen 

but in case solution can I apply the conditions of both the navigators. do you have any solution to this issue? thanks