【问题标题】:Can I use Firebase actions in the background of an app (while the app is closed), iOS, Swift我可以在应用程序(应用程序关闭时)、iOS、Swift 的后台使用 Firebase 操作吗
【发布时间】:2019-08-28 10:26:37
【问题描述】:

我想将一张图片和一些数据上传到 Firebase 存储和 Firebase Firestore。我的所有代码都在工作,但是当我离开应用程序时,上传停止。有没有办法让任务在后台运行?

我知道 URLSession 可以,但我不知道如何使用 Firebase。

总结:

我想在 Swift 的后台(应用关闭时)将数据上传到 Firebase。

提前致谢!

【问题讨论】:

标签: ios swift firebase background-task


【解决方案1】:

这段代码似乎有效:

class PhotoUploadManager {
  static var urlSessionIdentifier = "photoUploadsFromMainApp"  // Should be changed in app extensions.
  static let urlSession: URLSession = {
    let configuration = URLSessionConfiguration.background(withIdentifier: PhotoUploadManager.urlSessionIdentifier)
    configuration.sessionSendsLaunchEvents = false
    configuration.sharedContainerIdentifier = "my-suite-name"
    return URLSession(configuration: configuration)
  }()

  // ...

  // Example upload URL: https://firebasestorage.googleapis.com/v0/b/my-bucket-name/o?name=user-photos/someUserId/ios/photoKey.jpg
  func startUpload(fileUrl: URL, contentType: String, uploadUrl: URL) {
    Auth.auth().currentUser?.getIDToken() { token, error in
      if let error = error {
        print("ID token retrieval error: \(error.localizedDescription)")
        return
      }
      guard let token = token else {
        print("No token.")
        return
      }

      var urlRequest = URLRequest(url: uploadUrl)
      urlRequest.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
      urlRequest.setValue(contentType, forHTTPHeaderField: "Content-Type")
      urlRequest.httpMethod = "POST"
      let uploadTask = PhotoUploadManager.urlSession.uploadTask(with: urlRequest, fromFile: fileUrl)
      uploadTask.resume()
    }
  }
}

感谢@Gagan_iOS! 资源: https://github.com/firebase/firebase-ios-sdk/issues/147

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