ReactNative iOS Launch Screen No Flash

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  
	// 1. init window
	self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
	UIViewController *rootViewController = [UIViewController new];

	// 2. backgroundView using LaunchScreen.xib
	UIView *backgroundView = [[[NSBundle mainBundle] loadNibNamed:@"LaunchScreen" owner:self options:nil] firstObject];
	backgroundView.frame = self.window.bounds;
	
	// 3. ReactNative init
	NSURL *jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.ios" fallbackResource:nil];
	RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
			                                              moduleName:@"MyAwesomeApp"
			                                       initialProperties:nil
			                                           launchOptions:launchOptions];

	// 4. rootView background clear, so our backgroundView can show until ReactNative has fully loaded
	rootView.backgroundColor = [UIColor clearColor];

	// 5. set loadingView to the LaunchScreen.xib view too
	// explicitly set all frames
	UIView *launchScreenView = [[[NSBundle mainBundle] loadNibNamed:@"LaunchScreen" owner:self options:nil] firstObject];
	rootView.frame = self.window.bounds;
	launchScreenView.frame = self.window.bounds;
	rootView.loadingView = launchScreenView;

	// 6. set the backgroundView as main view for the rootViewController (instead of the rootView)
	rootViewController.view = backgroundView;

	// 7. show
	self.window.rootViewController = rootViewController;
	[self.window makeKeyAndVisible];

	// 8. after the window is visible, add the rootView as a subview to your backgroundView
	[backgroundView addSubview:rootView];

	return YES;
}