swift - iBeacon background ranging -

i'm trying set application way start ranging in background , notification when user hit shoulder button or home button(not time) , don't want using background mode.

so coded in swift, works when app working in background 10 seconds , ranging won't restarted when user re-enter or exit region callback 180 seconds means ranging work 3 minutes send notification in first 10 seconds.

i started task in background , call run function wake init function. i'll happy if shares experience.

func applicationdidenterbackground(_ application: uiapplication) {     // use method release shared resources, save user data, invalidate timers, , store enough application state information restore application current state in case terminated later.     // if application supports background execution, method called instead of applicationwillterminate: when user quits.     backgroundtask1.run(application:     application) { (backgroundtask1_) in       } 

run , init functions:

class func run(application: uiapplication, handler: (backgroundtask1) -> ()) {      let backgroundtask = backgroundtask1(application: application)     backgroundtask.begin()     handler(backgroundtask) }  func init_() {     let uuidstring = "43f2acd1-5522-4e0d-9e3f-4a828ea12c24"     let beaconregionidentifier = "hello"     let beaconuuid:uuid = uuid(uuidstring:uuidstring)!     beaconregion = clbeaconregion(proximityuuid: beaconuuid, identifier: beaconregionidentifier)      beaconregion.notifyentrystateondisplay = true      locationmanager_ = cllocationmanager()       if (cllocationmanager.authorizationstatus() != clauthorizationstatus.authorizedwheninuse) {         locationmanager_!.requestwheninuseauthorization()     }     locationmanager_?.allowsbackgroundlocationupdates = true     locationmanager_!.delegate = self     locationmanager_!.pauseslocationupdatesautomatically=false      locationmanager_?.startrangingbeacons(in: beaconregion) } 

this notificaion's code:

func locationmanager(_ manager: cllocationmanager, didrangebeacons beacons: [clbeacon], in region: clbeaconregion) {      print("sdljflkj")      if beacons.count == 0 {          return     }       let currentbeacon = beacons[0]     lastproximity = currentbeacon.proximity      if currentbeacon.proximity == clproximity.immediate{           dispatchqueue.global(qos: .userinitiated).async {              let content = unmutablenotificationcontent()             content.title = "forget me not"             content.body = "are forgetting something?"             content.sound = .default()              let request = unnotificationrequest(identifier: "forgetmenot", content: content, trigger: nil)             unusernotificationcenter.current().add(request, withcompletionhandler: nil)              print("here1")              notificationcenter.default.post(name: notification.name(rawvalue: "ibeaconfoundreceivednotification"), object: nil, userinfo: ["major":currentbeacon.major, "minor": currentbeacon.minor])         }     } }