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React Native Application

Setup

This project was bootstrapped with Create React Native App. Clone the project then run npm install

Libraries

Panresponder(https://reactnative.dev/docs/panresponder)

React-native-gesture-handler(https://docs.swmansion.com/react-native-gesture-handler/docs/)

Re-animated(https://docs.swmansion.com/react-native-reanimated/)

This project includes some libraries for using Image Swiper.

Table of Contents

• Available Scripts
  • expo start ios
  • expo start android

Updating to New Releases

You should only need to update the global installation of create-react-native-app very rarely, ideally never.

Updating the react-native-scripts dependency of your app should be as simple as bumping the version number in package.json and reinstalling your project's dependencies.

expo start --ios

Attempts to open your app in the iOS Simulator if you're on a Mac and have it installed.

expo start --android

Attempts to open your app on a connected Android device or emulator. Requires an installation of Android build tools (see React Native docs for detailed setup). We also recommend installing Genymotion as your Android emulator. Once you've finished setting up the native build environment, there are two options for making the right copy of adb available to Create React Native App:

Environment Variables

You can configure some of Create React Native App's behavior using environment variables.

Sharing and Deployment

Create React Native App does a lot of work to make app setup and development simple and straightforward, but it's very difficult to do the same for deploying to Apple's App Store or Google's Play Store without relying on a hosted service.

Publishing to Expo's React Native Community

Expo provides free hosting for the JS-only apps created by CRNA, allowing you to share your app through the Expo client app. This requires registration for an Expo account.

Install the exp command-line tool, and run the publish command:

$ npm i -g exp
$ exp publish

Building an Expo "standalone" app

You can also use a service like Expo's standalone builds if you want to get an IPA/APK for distribution without having to build the native code yourself.

Networking

If you're unable to load your app on your phone due to a network timeout or a refused connection, a good first step is to verify that your phone and computer are on the same network and that they can reach each other. Create React Native App needs access to ports 19000 and 19001 so ensure that your network and firewall settings allow access from your device to your computer on both of these ports.

Try opening a web browser on your phone and opening the URL that the packager script prints, replacing exp:// with http://. So, for example, if underneath the QR code in your terminal you see:

exp://192.168.0.1:19000

Try opening Safari or Chrome on your phone and loading

http://192.168.0.1:19000

and

http://192.168.0.1:19001

If this works, but you're still unable to load your app by scanning the QR code, please open an issue on the Create React Native App repository with details about these steps and any other error messages you may have received.

If you're not able to load the http URL in your phone's web browser, try using the tethering/mobile hotspot feature on your phone (beware of data usage, though), connecting your computer to that WiFi network, and restarting the packager.

iOS Simulator won't open

If you're on a Mac, there are a few errors that users sometimes see when attempting to expo start ios:

• "non-zero exit code: 107"
• "You may need to install Xcode" but it is already installed
• and others

There are a few steps you may want to take to troubleshoot these kinds of errors:

1. Make sure Xcode is installed and open it to accept the license agreement if it prompts you. You can install it from the Mac App Store.
2. Open Xcode's Preferences, the Locations tab, and make sure that the Command Line Tools menu option is set to something. Sometimes when the CLI tools are first installed by Homebrew this option is left blank, which can prevent Apple utilities from finding the simulator. Make sure to re-run expo start ios after doing so.
3. If that doesn't work, open the Simulator, and under the app menu select Reset Contents and Settings.... After that has finished, quit the Simulator, and re-run expo start ios.