Updating react native and getting Subclasses must implement a valid getBundleURL method

Question

I've recently updated react native to the latest version (as painful as it is), and I'm getting this error. The code compiles fine but as soon as the app runs I receive this.

'RCTAppDelegate::bundleURL not implemented', reason: 'Subclasses must implement a valid getBundleURL method'

Any ideas? Thanks!

Answer 1

I've been through this as well and solved this issue by dividing the sourceURLForBridge method inside the AppDelegate.m into two functions:

If you're using expo it should be:

- (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
{
  return [self bundleURL];
}

- (NSURL *)bundleURL
{
#if DEBUG
  return [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@".expo/.virtual-metro-entry"];
#else
  return [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
#endif
}

If you're using plain cli it should be:

- (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
{
  return [self bundleURL];
}

- (NSURL *)bundleURL
{
#if DEBUG
  return [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index"];
#else
  return [[NSBundle mainBundle] URLForResource:@"main" withExtension:@"jsbundle"];
#endif
}

This is also how you're AppDelegate looks like, if you create a plain new project - which is always a good reference after updating an old one.