Tabs flicker on load

[nfcampos]

the tab bar items flicker on load when using a tabs screen, see movie on the url for details

I'd guess it's due to using animated: true https://github.com/airbnb/native-navigation/blob/master/lib/ios/native-navigation/ReactTabBarController.swift#L167 here,

https://www.dropbox.com/s/oxdi8t1r2fmqmie/native-navigation%20tabs%20flicker%20bug.m4v?dl=0

[benkraus]

So. I actually have done something that I think would fix this problem. In our in-house native navigation lib where I work, we ended up doing something tricky, where we essentially did 1 ish renders of the screen components. I say "ish" because it does a dumb render first where it doesn't render anything, only to get the props (such as the tab item config), then kicks off a full render after it has the basic props.

That may fix this issue here. I'll have to play around with it and see.