ios - can you run a background task in a notification service? -


i have push notification service (unnotificationserviceextension) intercepts push notifications show rich push notifications. tried contact server think service terminated before runs code. figured out [modified] bit @ end not being there code , there without code.

i've looked silent notifications found out that doesn't run when user kills app that's no good.

now thinking along lines of: 

let queue = dispatchqueue.global(qos: .background)  queue.async {     self.contactserver() }

it runs server never contacted. not sure if code works not? do? how pass task system run in background because think service fast wait server contacted. sorry, new swift , ios in general.

is there way can along lines of:

await contactserver()

note: know swift doesn't have await trying here.

here full code:

import usernotifications import serverengine import uikit  class notificationservice: unnotificationserviceextension {   var backgroundtask: uibackgroundtaskidentifier! var contenthandler: ((unnotificationcontent) -> void)? var bestattemptcontent: unmutablenotificationcontent?  override func didreceive(_ request: unnotificationrequest, withcontenthandler contenthandler: @escaping (unnotificationcontent) -> void) {     self.contenthandler = contenthandler     bestattemptcontent = (request.content.mutablecopy() as? unmutablenotificationcontent)      if let bestattemptcontent = bestattemptcontent {         // modify notification content here...         bestattemptcontent.title = "\(bestattemptcontent.title) [modified]"          dobgtask()           contenthandler(bestattemptcontent)     } }   func dobgtask() {     let queue = dispatchqueue.global(qos: .background)     queue.async {         serverengine.touchbase()     } }


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