Swift Reference

Modern Swift, explained with code.

Copy-ready patterns for Swift 6, SwiftUI, concurrency, SwiftData, Apple Intelligence and StoreKit 2 — each with the pitfalls that trip developers (and AI assistants) up.

⚡ ConcurrencyIntermediate

async / await

Write asynchronous code that reads top-to-bottom, with errors handled by normal try/catch.

Swift 5.5+ · iOS 13+

⚡ ConcurrencyAdvanced

Task, Cancellation & TaskGroup

Start concurrent work, cancel it cooperatively, and fan out a dynamic number of child tasks.

Swift 5.5+

⚡ ConcurrencyAdvanced

Actors

Protect mutable state from data races — only one task touches an actor's state at a time.

Swift 5.5+

⚡ ConcurrencyIntermediate

@MainActor & UI Updates

Guarantee UI code runs on the main thread — and understand Swift 6.2 default MainActor isolation.

Swift 5.5+ · default isolation option Swift 6.2

⚡ ConcurrencyAdvanced

Sendable & Swift 6 Data-Race Safety

Understand the Sendable checks behind most Swift 6 errors — and how to fix them properly.

Swift 5.5+ · enforced in Swift 6 language mode

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