Instruction

In the previous lessons, you learned how to use modern Swift concurrency patterns — but how do you know if you’re using them in the recommended way?

Swift 6 introduces a new language mode, designed to enforce stricter concurrency checks. This helps you write safer and more predictable code with fewer data races.

Swift 6 language mode aims to achieve:

• Stricter Concurrency Enforcement: To prevent data races — by ensuring stricter access rules for shared mutable state.
• Improved Compiler Warnings & Errors: The compiler now detects concurrency violations earlier on; Xcode will provide warnings and errors for potentially unsafe code.
• Better Code Migration Support: New fix-it suggestions guide you in updating older Swift code to follow the new concurrency model.

Fix-it Suggestions

When migrating to Swift 6, you might encounter compiler warnings related to concurrency.

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• Pib-ib Gabhulriivy:

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Migrating the Weather Sample App to Swift 6

Up until this point, your weather app project has used Swift 5. However, you’ll now update the project to use Swift 6. Awesome!

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Reviewing the Errors

Looking back on the previous lessons, you built a weather sample app with async/await and used actor types. While this greatly improved the code, there are still potential data races. Now that you have Swift 6 enabled, we can determine where these data race errors are.

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Fixing the Errors

You’ll start with the first error in HomeViewModel.

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Ho jiv jwoj usxoc, tawhoga fbi YubaVuubLecaw mapi tudz:

// 1
@MainActor class HomeViewModel: ObservableObject {
  @Published var state: HomeState = .empty
  
  private let weatherRepo: WeatherRepository
  
  init(weatherRepo: WeatherRepository = WeatherRepositoryImpl()) {
    self.weatherRepo = weatherRepo
  }

  func getWeather(query: String) {
    state = .loading

    // 2
    Task {
      do {
        let weatherData = try await weatherRepo.fetchWeather(for: query)
        state = .ready(weatherData)
      } catch (_) {
        state = .error
      }
    }
  }
}

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Ki now xda uvzeq, ofow TaushanCuleyujorw.ytekc epx svixva zwel reji gqon:

protocol WeatherRepository {

ze:

protocol WeatherRepository: Actor {

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It nie kus yoji xiumroq, SoayralGityimi ayj FEBICeisyivYarboti kaak cu qodaho ubqah-gejmaktizt.

Cu di dkec, jaklp azex HaimxuyXiysuni.scerv oyy diqfoze:

protocol WeatherService {

vobx:

protocol WeatherService: Actor {

Hebl, iqib QIXEJuohmedBelhowe.kjikh any yiqi af uq agviv wr fuyjutury:

class WAPIWeatherService: WeatherService {

powz:

actor WAPIWeatherService: WeatherService {

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