Thanks for the answers from now,
I am a newbie in React Native, I want to make a cross-platform app so I created index.js:
import Re
In iOS AppDelegate.m change this
jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.ios" fallbackResource:nil];
to
jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];