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BGTaskScheduler 因“BGTaskSchedulerErrorDomain”而失败 - 代码：iOS 13.0 上的 1

我已经尝试了 Apple 提供的示例程序 ColorFeed，但它面临同样的问题

let request = BGProcessingTaskRequest(identifier: "com.example.apple-samplecode.ColorFeed.db_cleaning")
request.requiresNetworkConnectivity = false
request.requiresExternalPower = true

do 
{
  try BGTaskScheduler.shared.submit(request)
} catch {
  print("Could not schedule database cleaning: \(error)")
}

上面的代码在 applicationDidEnterBackground 中被调用

早些时候，该任务在 didFinishLaunchingWithOptions 中注册...

 BGTaskScheduler.shared.register(forTaskWithIdentifier: "com.example.apple-samplecode.ColorFeed.db_cleaning", using: nil) { task in

        // Downcast the parameter to a processing task as this identifier is used for a processing request.
        self.handleDatabaseCleaning(task: task as! BGProcessingTask)

 }