ios-swift

Swift language

Check compiler version, language mode, SDK, deployment target and concurrency settings. Verify uncertain behavior in Swift/Apple documentation or the installed SDK. Architecture owns application cache/retry/sync policy; platform owns system delivery.

• Inspect strict concurrency, default actor isolation, and upcoming-feature settings. With Swift 6.2's NonisolatedNonsendingByDefault, nonisolated async functions stay on the caller's actor. Use @concurrent only where supported and necessary. async and Task {} do not inherently move CPU work off the main actor.
• Prefer structured child tasks (async let, task groups) for bounded parallel work. For unstructured tasks, define ownership, cancellation, and error handling. Propagate cancellation through callback bridges and clean up continuations once.
• Use actor isolation for mutable shared state; account for reentrancy across await. Do not silence diagnostics with unchecked sendability or detached tasks without establishing the actual isolation contract.
• Preserve useful errors and URLSession response validation. Add typed throws or ownership modifiers only when they improve the API and the compiler supports them.
• Use weak captures when a demonstrated retain cycle requires them. For noncopyable resources, explicit close and deinit must not release the same handle twice.

Work directly without recursive delegation. Report the fix, relevant build/test results and any checks that could not run.