Realm Sync Progress (iOS / Swift) -


i have setup app realm local , sync, seems well. implemented sync progress multiple remote realms. working great also.

however, after changing not-sync progress specific code, weird thing happened. 50mb database used 5-6 notifications, first , when sync finished.

i revert old code, same db, getting multiple notifications.

i have been trying solve last couple of days no luck. idea why happen?

in singleton called businessmanager, keep references this:

class businessmanager {     static let shared = businessmanager()      struct syncnotificationtoken {         let business: business         let downloadtoken: syncsession.progressnotificationtoken         let uploadtoken: syncsession.progressnotificationtoken     }      private var synctokens: [string:syncnotificationtoken] = [:] }

update sync progress references in each change realm:

private func configureremotebusinessesnotification() {     guard let remotebusinesses = remotebusinesses else { dlog("error obtaining remote businesses"); assert(false); return }      remotebusinessesnotificationtoken?.stop()      remotebusinessesnotificationtoken = remotebusinesses.addnotificationblock { changes in         switch changes {         case .initial:             self.delegate?.loadedremotebusinesses()             self.updatebusinessprogresses()          case .update(let results, let deletions, let insertions, let modifications):             self.delegate?.remotenotificationupdate(results: results, deletions: deletions, insertions: insertions, modifications: modifications)             self.updatebusinessprogresses()          case .error(let error):             self.delegate?.notificationerror(error)         }     } }

after each change, discard old progress , create new 1 (i tried holding reference , skipped creating if progress exists; did not make difference in terms of problem having).

each time receive progress notification, create new struct holding info , send via notification (previously used delegate; since businessmanager class singleton, preferred using notification instead):

func updatebusinessprogresses() {     guard let businesses = remotebusinesses else { return }     business in businesses {         guard let realmurl = business.realmself.configuration.syncconfiguration?.realmurl else { assert(false); return }         guard let user = syncuser.current else { assert(false); return }         guard let session = user.session(for: realmurl) else { assert(false); return }          dlog("progress url: \(realmurl.description)")          let uploadtoken = session.addprogressnotification(for: .upload, mode: .reportindefinitely, block: { progress in             dlog("upload \(progress.transferrablebytes)")             dispatchqueue.main.async {                 let object: [string:double] = [business.uuid:progress.fractiontransferred]                 dlog("upload \(business.uuid), fractiontransferred: \(int(progress.fractiontransferred*100))")                 notificationcenter.default.post(name: notification.upload.name, object: object)             }         })          let downloadtoken = session.addprogressnotification(for: .download, mode: .reportindefinitely, block: { progress in             dlog("download \(progress.transferrablebytes)")             dispatchqueue.main.async {                 let object: [string:double] = [business.uuid:progress.fractiontransferred]                 dlog("download \(business.uuid), fractiontransferred: \(int(progress.fractiontransferred*100))")                 notificationcenter.default.post(name: notification.download.name, object: object)             }          })          guard let _uploadtoken = uploadtoken, let _downloadtoken = downloadtoken else { assert(false); return }         // hold reference keep getting progresses         synctokens[business.uuid] = syncnotificationtoken(business: business, downloadtoken: _downloadtoken, uploadtoken: _uploadtoken)     } }

what reason receiving notification @ start , @ end of sync progress , no progress update in between?

any guidance highly appreciated.


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