RCTBridge required dispatch_sync to load RCTDevLoadingView. This may lead to deadlocks

Question

I get this in logs:

RCTBridge required dispatch_sync to load RCTDevLoadingView. This may lead to deadlocks

This is leading to

Answer 1

I fixed it with updating AppDelegate.m as below:

#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:@"<AddYourAppNameHere>"
                                            initialProperties:nil];
  ...
}

Source: devburmistro's answer Dec 10, 2017 from: https://github.com/facebook/react-native/issues/16376

Answer 2

Swift Solution

let bridge = RCTBridge(bundleURL: jsCodeLocation, moduleProvider: nil, launchOptions: nil)

#if RCT_DEV
bridge?.module(for: RCTDevLoadingView.self)
#endif
let rootView = RCTRootView(bridge: bridge!, moduleName: "AppMain", initialProperties: nil)