Upgrading a codebase to Swift 6 often feels like hitting a wall. You flip the switch to strict concurrency checking, and suddenly, a project that compiled perfectly is flooded with errors. "Type 'X' does not conform to 'Sendable'." "Capture of non-sendable type in @Sendable closure." "Main actor-isolated property 'y' can not be referenced from a non-isolated context." These are not just linting annoyances; they are fundamentally changing how Swift handles memory safety. Swift 6 enforces complete concurrency safety at compile time. This guide breaks down the root causes of these errors and provides architectural patterns to resolve them without suppressing valid warnings. The Root Cause: Isolation Boundaries To fix these errors, you must understand the underlying model. Swift 6 views your memory as a series of Isolation Domains . The Main Actor: The UI thread. Actors: Custom isolated buckets of mutable state. The Sea of Conc...
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