iOS / Swift / Concurrency and data boundaries

iOS / Swift β€” Concurrency and data boundaries

Cancellation, HTTP decoding, observed models, freshness, persistence contexts, and test evidence.

6 lessons Β· No account required

What you will learn

  • Cancellation, HTTP decoding, observed models, freshness, persistence contexts, and test evidence.

  1. Async, await, and structured cancellation

    Understand suspension and cooperative cancellation before connecting tasks to a screen lifetime.

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  2. URLSession, Codable, and response contracts

    Separate transport success, HTTP acceptance, decoding, and domain validation before publishing remote data.

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  3. Observation and main-actor models

    Separate change tracking, mutation authority, actor isolation, and resource ownership in a shared UI model.

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  4. Actor reentrancy and result freshness

    Protect semantic ordering across suspension points even when actor isolation already prevents unsynchronized memory access.

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  5. Versioned storage and SwiftData contexts

    Distinguish serialization, tracked in-memory changes, persistence, and authoritative synchronization.

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  6. Swift Testing, XCTest, and test boundaries

    Use deterministic model checks and separate them from Apple-hosted UI, persistence, and device evidence.

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