【Swift】URLSession で Passing argument of non-sendable type '(any URLSessionTaskDelegate)?' outside of main actor-isolated context may introduce data races 👉 https://android.benigumo.com/20240709/swift-concurrency/

TestView.swift

import SwiftUI

struct TestView: View {
  @State private var text = "-"
  private let url = URL(string: "https://wttr.in/?format=3")!
  //private let url = URL(string: "https://httpbin.org/get")!

  var body: some View {
    Text(text)
      .task {
        // ! Passing argument of non-sendable type '(any URLSessionTaskDelegate)?'
        // outside of main actor-isolated context may introduce data races
        //let (data, _) = try! await URLSession.shared.data(from: url)

        // ! Capture of 'self' with non-sendable type 'TestView' in 'async let' binding
        // Consider making struct 'TestView' conform to the 'Sendable' protocol
        //async let (dataEx, _) = try! await URLSession.shared.data(from: url)
        //let data = await dataEx

        // ! Passing argument of non-sendable type 'TestView'
        // outside of main actor-isolated context may introduce data races
        // Consider making struct 'TestView' conform to the 'Sendable' protocol
        //let (data, _) = await dataEx(url: url)

        // OK
        //let (data, _) = await URLSession.shared.dataEx(url: url)
        
        // OK
        //let (data, _) = await url.dataEx()

        // OK
        //let (data, _) = await WeatherA.getData(url: url)

        // OK
        //let (data, _) = await WeatherA().getData(url: url)

        // OK
        //let (data, _) = await WeatherC.getData(url: url)

        // OK
        let (data, _) = await WeatherC().getData(url: url)


        text = String(data: data, encoding: .utf8)!
      }
  }

  // !
  nonisolated private func dataEx(url: URL) async -> (Data, URLResponse) {
    try! await URLSession.shared.data(from: url)
  }
}

// OK
extension URLSession {
  func dataEx(url: URL) async -> (Data, URLResponse) {
    try! await data(from: url)
  }
}

// OK
extension URL {
  func dataEx() async -> (Data, URLResponse) {
    try! await URLSession.shared.data(from: self)
  }
}


actor WeatherA {

  // OK
  static func getData(url: URL) async -> (Data, URLResponse) {
    try! await URLSession.shared.data(from: url)
  }

  // OK
  nonisolated func getData(url: URL) async -> (Data, URLResponse) {
    try! await URLSession.shared.data(from: url)
  }
}

final class WeatherC: Sendable {
//class WeatherC: @unchecked Sendable {

  // OK
  static func getData(url: URL) async -> (Data, URLResponse) {
    try! await URLSession.shared.data(from: url)
  }

  // OK
  nonisolated func getData(url: URL) async -> (Data, URLResponse) {
    try! await URLSession.shared.data(from: url)
  }
}


#Preview {
  TestView()
    .frame(width: 300, height: 300)
}

【Swift】URLSession で Passing argument of non-sendable type '(any URLSessionTaskDelegate)?' outside of main actor-isolated context may introduce data races
👉 https://android.benigumo.com/20240709/swift-concurrency/