how can i migrate app from objective-c to swift

To migrate your app from Objective-C to Swift, you can follow a structured approach as outlined in the WWDC session "Migrate your app to Swift 6." Here are the key steps:

1. Preparation:

   • Ensure your app builds with the latest Xcode version.
   • Enable Swift 6 language mode to take advantage of new features and safety guarantees.

2. Incremental Migration:

   • Migrate each target in your project one at a time.
   • Enable complete concurrency checking for each target. This will provide warnings for code that would fail under Swift 6's enforced data isolation.
   • Resolve all warnings for the target before fully enabling Swift 6 mode.

3. Concurrency and Data Isolation:

   • Perform main actor and sendable audits to identify and fix potential data races.
   • Use the compiler diagnostics to guide you towards areas that need fixing, acting like a pair programmer.

4. Refactoring:

   • Once all targets are migrated, consider doing a whole app refactoring to ensure no unsafe code remains.
   • This may involve undoing some unsafe opt-outs and ensuring all code adheres to Swift 6's safety guarantees.

For a detailed, step-by-step guide, you can refer to the session Migrate your app to Swift 6 (07:17).

Additionally, you can explore the session What’s new in Swift (29:49) for best practices on migration and new features in Swift 6.

Relevant Sessions

1. Migrate your app to Swift 6
2. What’s new in Swift

These sessions provide comprehensive guidance and practical examples to help you through the migration process.