Modern Concurrency: Beyond the Basics

Oct 20 2022 · Swift 5.5, iOS 15, Xcode 13.4

Part 2: Concurrent Code

16. GlobalActor

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Previous episode: 15. Writing Safe Concurrent Code With Actors Next episode: 17. Creating a GlobalActor

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Throughout this course, whenever you’ve needed to make quick changes that drive the UI, you’ve called to access MainActor from anywhere. Because your app runs on a single main thread, you can’t create a second or a third MainActor. So it does make sense that there’s a default, shared instance of that actor that you can safely use from anywhere.

@globalActor actor ImageDatabase {
  static let shared = ImageDatabase()
  // ...
@ImageDatabase func say(_ text: String) {
  // ... automatically runs on ImageDatabase ...

@ImageDatabase class DiskStorage { 
  // ...