how to specify an lsminimumsystemversion in expo app

Lussy04

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24-01-2025

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Expo allows you to build cross-platform mobile applications with ease. However, ensuring compatibility with different operating systems and their versions is crucial. This article focuses on specifying the minimum supported iOS version using the lsMinimumSystemVersion property within your Expo app. Understanding and correctly setting this is key to a smooth user experience and avoiding crashes on older devices.

Understanding lsMinimumSystemVersion

The lsMinimumSystemVersion property within your Expo app's configuration dictates the minimum iOS version your app will support. If a user attempts to install your app on a device running an older iOS version than the one specified, the app store will prevent the installation. This prevents users from encountering compatibility issues and potential crashes.

Setting lsMinimumSystemVersion in Your Expo Project

There are two primary ways to specify the minimum iOS system version: through the app.json (or expo.json) file or using Expo's configuration APIs.

Method 1: Modifying app.json (or expo.json)

This is the simplest and most common method. Open your project's app.json (or expo.json depending on your Expo SDK version) file. You'll find an ios section within the expo object. Inside this section, add or modify the lsMinimumSystemVersion property.

{
  "expo": {
    "name": "My Expo App",
    "slug": "my-expo-app",
    "ios": {
      "lsMinimumSystemVersion": "14.0",  // Set your desired minimum version here
      "bundleIdentifier": "com.example.myapp"
    },
    "android": {
      "package": "com.example.myapp"
    }
  }
}

Replace "14.0" with your desired minimum iOS version. Remember to use the correct version number format (e.g., "16.0", "17.1"). After saving changes, run expo prebuild to ensure the changes are reflected in your build process.

Important: Carefully consider the features your app uses. Setting the minimum version too low might lead to compatibility issues and crashes. Conversely, setting it too high could exclude a significant portion of your potential user base. Consult Apple's documentation for detailed information on iOS version adoption rates.

Method 2: Using Expo Config Plugins (More Advanced)

For more complex scenarios or to dynamically determine the minimum version based on your app's needs, you can leverage Expo config plugins. This approach offers more flexibility but requires a deeper understanding of Expo's configuration system.

This method typically involves creating a custom plugin that modifies the ios configuration object at build time. Refer to the official Expo documentation on config plugins for detailed instructions on how to implement this.

Testing Your Minimum System Version Setting

After setting lsMinimumSystemVersion, thoroughly test your app on devices or simulators running both above and below the specified minimum version. Verify that the app installs correctly on devices meeting or exceeding the minimum requirement and that the App Store prevents installation on devices with older iOS versions.

Best Practices and Considerations

• Check iOS Version Adoption Rates: Before setting your minimum version, research the adoption rates of different iOS versions to strike a balance between compatibility and reaching a wide audience. Data from sources like StatCounter can be helpful.
• Feature Dependency: Base your minimum iOS version on the features your app requires. Newer features might only be available on later iOS versions.
• Regular Updates: Keep your app updated with the latest Expo SDK and compatible libraries to benefit from bug fixes and performance improvements.
• Gradual Updates: Consider a phased approach for increasing the minimum iOS version. If you need to raise the minimum version, do so gradually to minimize disruption to existing users.

By correctly specifying lsMinimumSystemVersion in your Expo app, you ensure better user experience, reduce potential crashes, and maintain a well-maintained application. Remember to carefully consider your target audience and the features your app utilizes when determining the appropriate minimum version.