How can you update and migrate your Swift mobile app code to the latest version?

1 Check the Swift version

The first step is to check which version of Swift your app is currently using. You can do this by opening your project in Xcode and going to Project > Build Settings > Swift Compiler - Language. There you will see the Swift Language Version setting, which shows the Swift version that your app is targeting. You can also check the Swift version by running swift --version in the Terminal.

2 Update the dependencies

The next step is to update the dependencies that your app relies on, such as libraries, frameworks, or packages. You can do this by using a dependency manager, such as CocoaPods, Carthage, or Swift Package Manager. Each dependency manager has its own commands and options for updating dependencies, so you should refer to their documentation for details. You should also check the release notes and changelogs of the dependencies to see if they have any breaking changes or new requirements.

3 Migrate the code

The third step is to migrate the code that is affected by the changes in the Swift version or the dependencies. You can do this by using the migration assistant in Xcode, which can automatically convert some of the syntax and APIs to the latest version. To use the migration assistant, go to Edit > Convert > To Current Swift Syntax and follow the instructions. However, the migration assistant may not be able to fix all the issues, so you should also review the code manually and make any necessary adjustments.

4 Test the app

The fourth step is to test the app to make sure that it works as expected after the migration. You can do this by running the app on a simulator or a device, and checking for any errors, warnings, or bugs. You should also run the unit tests and UI tests that you have for your app, and verify that they pass. If you encounter any problems, you should debug them and fix them before moving on.

5 Update the deployment target

The fifth step is to update the deployment target of your app, which is the minimum iOS version that your app supports. You can do this by going to Project > General > Deployment Info and changing the iOS Deployment Target setting. You should choose a deployment target that matches the Swift version and the dependencies that you are using, as well as your target audience and market. You should also update the Info.plist file and the App Store Connect settings accordingly.

6 Build and distribute the app

The final step is to build and distribute the app to your users. You can do this by using the Archive and Export options in Xcode, or by using a continuous integration and delivery tool, such as Fastlane or Bitrise. You should also update the app's metadata, screenshots, and release notes in the App Store Connect portal, and submit the app for review. Once the app is approved, you can release it to the App Store or TestFlight.

7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?