常见问题

注意

这个文档仍然是实验性的，随着我们的迭代，细节会有变化。欢迎在工作小组内的讨论中分享你的反馈。

此外，它还包含几个手动步骤。请注意新架构尚未稳定下来，最终的开发者体验会继续迭代改善。我们正在努力开发工具、模板和库，以帮助你在新架构上快速入门，而不需要经历整个设置过程。

This page contains resolutions to common problem you might face when migrating to the New Architecture.

Xcode Build Issues

Should the XCode Build fail with:

Command PhaseScriptExecution failed with a nonzero exit code

This error indicates that the codegen script that is injected into the Xcode build pipeline has exited early. You may get this for either your own library, or one of the core RN libraries (FBReactNativeSpec, rncore).

Open ~/Library/Developer/Xcode/DerivedData. and look for a folder named after your Xcode workspace (“RNTesterPods-AAAA” where “AAAA” is a string of characters). Within that folder, go to Build → Intermediates.noindex → Pods.build → Debug-iphonesimulator (or the equivalent for your iOS device, if applicable). Inside, look for the folder named after the codegen library has the script error. The logs for the script phase can be found within the DerivedSources folder, in a file named codegen-LibraryName.log. This log output should provide clarity on the source of the error.

CocoaPods and Node Reset

The CocoaPods integration will see frequent updates as we rollout the New Architecture, and it is possible to end up with your workspace in a broken state after one of these changes. You may clean up any changes related to the codegen by performing some of these steps:

1. Run pod deintegrate in your ios directory (or wherever your Podfile is located) and re-run pod install (or arch -x86_64 pod install, in case of a Mac M1).
2. Delete Podfile.lock and re-run pod install (or arch -x86_64 pod install, in case of a Mac M1).
3. Delete node_modules and re-run yarn install.
4. Delete your codegen artifacts and re-run pod install (or arch -x86_64 pod install, in case of a Mac M1), then clean and build your Xcode project.

Folly Version

As it happens, the Folly version used in your podspec must match whatever version is used in React Native at this time. If you see the following error after running pod install:

[!] CocoaPods could not find compatible versions for pod "RCT-Folly":

...you may have a version-mismatch. Take a look at your node_modules/react-native/React/FBReactNativeSpec/FBReactNativeSpec.podspec file and make note of the folly_version used there. Go back to your own podspec and set your folly_version to match.

Android build is failing with OutOfMemoryException

If your Android Gradle builds are failing with: OutOfMemoryException: Out of memory: Java heap space. or similar errors related to low memory, you might need to increase the memory allocated to the JVM.

You can do that by editing the gradle.properties file in your android/gradle.properties folder:

 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
 # Default value: -Xmx1024m -XX:MaxPermSize=256m
-# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+org.gradle.jvmargs=-Xmx4g -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8

Make sure to uncomment the line and set the preferred memory size with the -Xmx parameter. 2Gb should be the minimum required and 4Gb is recommended.

Android NDK and Mac with M1 Apple Silicon CPUs

We're aware of a series of incompatibilities between the Android NDK and Macs on M1 CPUs (here and here). As the New Architectecture relies on the NDK, you might face problems during your build.

React Native version 0.70 and 0.71 contains fixes for those build failures, and we invite you to update to those versions whenever possible.