react native 0.81 初始化工程

参考 reactnative.dev/docs/gettin…

Step 3: Start your application

yarn start
yarn ios

启动 ios 模拟器遇到问题 react native installing cocoapods dependencies error

google ai 给出的方法

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Encountering errors when installing CocoaPods dependencies in a React Native project is a common issue, often related to the Ruby environment or CocoaPods installation itself. Here are common solutions to address these errors:

1. Ruby Environment Issues:

• Ensure Correct Ruby Version:  CocoaPods often requires a specific Ruby version. Verify your current Ruby version with ruby --version. If it's outdated or incompatible, use a Ruby version manager like rbenv or RVM to install and switch to a compatible version.

# Example using rbenv
brew install rbenv ruby-build
rbenv init
echo 'eval "$(rbenv init - zsh)"' >> ~/.zshrc # or ~/.bash_profile
source ~/.zshrc # or ~/.bash_profile
rbenv install 3.2.2 # Or the required version
rbenv global 3.2.2

• Avoid System Ruby:  It's generally recommended to install Ruby using Homebrew or a version manager rather than relying on the system's default Ruby, which can lead to permission issues.

2. CocoaPods Installation Issues:

• Install/Update CocoaPods:  Ensure CocoaPods is installed and up-to-date.

sudo gem install cocoapods

If you encounter permission errors, consider using sudo.

• Permission Errors:  If pod install fails with permission errors, it might be due to CocoaPods being installed without sudo. Reinstalling with sudo gem install cocoapods can resolve this.
• Corrupted Pods Cache:  Sometimes, clearing the CocoaPods cache can help.

rm -rf Pods
rm Podfile.lock
pod cache clean --all
cd ios && pod install

3. React Native Specific Issues:

• Navigate to ios Directory: Ensure you are in the ios directory of your React Native project when running pod install.

cd ios
pod install

• npx expo install --fix (for Expo projects): 

  If you are using Expo, this command can help resolve dependency issues and potentially fix CocoaPods-related problems.

• Rebuild iOS Directory (for Expo projects):  

  If issues persist in an Expo project, try removing the ios directory and regenerating it using npx expo prebuild.

4. General Troubleshooting:

• Xcode Command Line Tools:  Ensure your Xcode Command Line Tools are updated.

xcode-select --install

• Xcode Version Compatibility:  

  Verify that your Xcode version is compatible with your React Native and CocoaPods versions.

• Path Issues:  

  Avoid project paths containing special characters or spaces, which can sometimes interfere with build tools.

• Verbose Output:  

  Run pod install --verbose to get more detailed error messages, which can provide clues for specific issues.