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Swift Concurrency Async

⬢ 層級 2技術
高
薪資影響
3 個月
學習時長
困難
難度
4
職業
一覽

Swift Concurrency (async/await, structured concurrency, actors) is Apple's modern approach to handling concurrent code safely. Used by iOS developers, macOS developers, and Swift backend engineers. Time to learn: 8–12 weeks. Sits between Swift fundamentals and advanced concurrent systems.

什麼是 Swift Concurrency Async

Swift Concurrency is Apple's modern concurrency framework introduced in Swift 5.5 (iOS 15+). It includes async/await (for writing asynchronous code that reads sequentially), structured concurrency (tasks, task groups, cancellation), and actors (for safe mutable state in concurrent code). Unlike callbacks or Combine, async/await makes concurrent code read like synchronous code. Threads are managed automatically; developers focus on what to do, not how to manage threads.

🔧 工具與生態
Swift 5.5+Xcodeasync/awaitActorsTask, TaskGroupDispatchQueuecombine (when needed)Testing frameworks

💰 各地區薪資

地區初級中級高級
USA$120,000$170,000$250,000
UK£85,000£130,000£200,000
EU€90,000€135,000€210,000
CANADACA$115,000CA$165,000CA$240,000

❓ 常見問題

What's the difference between async/await and Combine?
async/await is simpler, sequential code that looks like synchronous code. Combine is reactive, functional, and more powerful for complex event streams. Use async/await for simple async calls; use Combine for reactive pipelines.
Are actors a replacement for thread safety?
Actors ensure thread-safe access to mutable state. They don't eliminate threading; they make it safe. Always access actor's state through await.
Can you mix async/await with Combine?
Yes, you can wrap Combine publishers in async/await, and vice versa. But mixing is often unnecessary. Choose one paradigm per feature.
How do you handle errors in async code?
Use do-catch blocks in async functions. Throw errors like synchronous code. async/await makes error handling cleaner than callbacks or Combine.
What's the performance impact of async/await?
Minimal, async/await is compiled away. Performance is comparable to callbacks but with much cleaner code. No overhead vs. Combine for simple cases.

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