执行yarn eject后React Native应用无法启动问题求助

Hey there, let's work through why your ejected React Native project isn't launching from the terminal. After ejecting from Expo to a react-native init style project, there are a few common hiccups that might be blocking things—here's how to troubleshoot:

1. Reinstall Dependencies First #

Ejecting sometimes leaves dependency mismatches. Start by cleaning out your existing dependencies and reinstalling them:

• Delete your node_modules folder: rm -rf node_modules (Mac/Linux) or rmdir /s/q node_modules (Windows Command Prompt)
• Clear the yarn cache: yarn cache clean
• Reinstall dependencies: yarn install

2. Clear React Native's Cache #

React Native's cache can get messed up after ejecting. Run these commands to clear it:

• npx react-native start --reset-cache
• Wait for the Metro bundler to finish starting up, then try launching the app in a new terminal window.

3. Use the Correct Startup Commands #

After ejecting, you can't use Expo's expo start anymore—you need to use the standard React Native commands:

• For Android: npx react-native run-android
• For iOS: npx react-native run-ios
  Note: For iOS, make sure you have Xcode installed and open the ios/YourAppName.xcworkspace file first to let CocoaPods install any missing native dependencies if needed.

4. Check Native Folder Configurations #

Sometimes ejecting doesn't set up the native projects perfectly:

• Android: Go into the android folder and run ./gradlew clean to clean the build files, then try npx react-native run-android again.
• iOS: In the ios folder, run pod install to ensure all iOS dependencies are properly linked, then launch the app via the command line or Xcode.

5. Verify Node & React Native Versions #

Make sure you're using a compatible Node.js version with your React Native version. You can check your React Native version in package.json under react-native, and ensure your Node version matches the requirements listed in the React Native docs (usually LTS versions work best).

If none of these steps work, try checking the terminal error messages more closely—they'll usually give a clue about what's broken (like a missing dependency, build error, or Metro configuration issue).

内容的提问来源于stack exchange，提问作者Sameer