In the RootView of a React Native app, the default background color is white. We can change this to another color by following the steps below.
Note: Changing the background color may resolve issues related to launch screen flicker/flash and background color during orientation change.
rootView.backgroundColor = [[UIColor alloc] initWithRed:1.0f green:1.0f blue:1.0f alpha:1];
April 10, 2016