ExtensionDelegate_part.swift

func handle(_ backgroundTasks: Set<WKRefreshBackgroundTask>) {
    for task in backgroundTasks {

        switch task {
        case let backgroundTask as WKApplicationRefreshBackgroundTask:
            BackgroundService.shared.updateContent()
            backgroundTask.setTaskCompletedWithSnapshot(false)
            
        case let urlSessionTask as WKURLSessionRefreshBackgroundTask:
            BackgroundService.shared.handleDownload(urlSessionTask)
            
        default:
            task.setTaskCompletedWithSnapshot(false)
        }
    }
}