RCTBridge required dispatch_sync to load RCTDevLoadingView. This may lead to deadlocks
// I was able to workaround the warning by updating AppDelegate.m #if RCT_DEV #import <React/RCTDevLoadingView.h> #endif ... - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { ... RCTBridge *bridge = [[RCTBridge alloc] initWithBundleURL:jsCodeLocation moduleProvider:nil launchOptions:launchOptions]; #if RCT_DEV [bridge moduleForClass:[RCTDevLoadingView class]]; #endif RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge moduleName:@"Test" initialProperties:nil]; ... } // this workaround solved the warning. Thank you very much. //For anyone using this solution, if your xcode crashes and throws an error at initWithBundleURL: jsCodeLocation, substitute jsCodeLocation = NSURL *jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.js" fallbackResource:nil]; // This solved the issue for me
