Summary:
The main goal of this change is to fix an issue that happens on iOS when the native app starts before the packager server is available which causes app reloads to fail continually until the app is restarted.
What happens is that with the current setup we call `RCTBundleURLProvider#jsBundleURLForBundleRoot` once in `AppDelegate#didFinishLaunchingWithOptions`. If at that point the packager server is not running yet it will return nil (expected behaviour) and that will be passed to the bridge constructor. Subsequent reloads will keep trying to load this nil bundle url since it has no way to ask `RCTBundleURLProvider` for a new url now that the packager is actually running.
We can fix this by using `RCTBridgeDelegate` instead which is a lot more flexible. Instead of passing the bundle url at construction time it will call the `sourceURLForBridge` method each time the bridge is reloaded. This means that even if the packager is not running yet and that `RCTBundleURLProvider` returns nil for the first invocation, subsequent reloads will call `RCTBundleURLProvider` again for a new value.
Changelog:
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[iOS] [Added] - Use RCTBridgeDelegate in the new project template
Pull Request resolved: https://github.com/facebook/react-native/pull/23031
Differential Revision: D13710048
Pulled By: cpojer
fbshipit-source-id: 0059c5c962d508737ae410a82315c11ad305efe8
Summary: This diff moves the React Native template from `local-cli/templates/HelloWorld` to `template`. Keeping it in the react-native repo will allow us to make changes to the template and version it together with react-native, instead of moving it out into a separate repo and trying to keep the template in sync with RN.
Reviewed By: TheSavior
Differential Revision: D13372949
fbshipit-source-id: e68e267b4dcf6384535d7b48fc11e297a12e9676
Janic Duplessis
Christoph Nakazawa