objective c - Play/Pause and Elapsed Time not updating in iOS command center properly -

i have video player can play ios command center , lock screen. when toggle play/pause button in app, should update play/pause button in command center (mpremotecommandcenter) updating nowplayinginfo (mpnowplayinginfocenter). i'm not sure why it's not updating.

for example, if pause video custom button in app, command center still shows pause button (meaning video still playing wrong.)

this how update nowplayinginfo:

func updatempnowplayinginforcentermetadata() {     guard video != nil else {         nowplayinginfocenter.nowplayinginfo = nil         return     }      var nowplayinginfo = nowplayinginfocenter.nowplayinginfo ?? [string: any]()      let image: uiimage     if let placeholderlocalurl = video.placeholderlocalurl, let placeholderimage = uiimage(contentsoffile: placeholderlocalurl.path) {         image = placeholderimage     } else {         image = uiimage()     }      let artwork = mpmediaitemartwork(boundssize: image.size, requesthandler: { _ -> uiimage in         return image     })      nowplayinginfo[mpmediaitempropertytitle] = video.title     nowplayinginfo[mpmediaitempropertyalbumtitle] = video.creator?.name ?? " "     nowplayinginfo[mpmediaitempropertyartwork] = artwork      nowplayinginfo[mpmediaitempropertyplaybackduration] = float(video.duration)     nowplayinginfo[mpnowplayinginfopropertyelapsedplaybacktime] = float(currenttime) // cmtimegetseconds(player.currentitem!.currenttime())     nowplayinginfo[mpnowplayinginfopropertyplaybackrate] = player.rate     nowplayinginfo[mpnowplayinginfopropertydefaultplaybackrate] = player.rate      nowplayinginfocenter.nowplayinginfo = nowplayinginfo      if player.rate == 0.0 {         state = .paused     } else {         state = .playing     } } 

with kvo, when player's rate changes, call function:

// mark: - key-value observing method  override func observevalue(forkeypath keypath: string?, of object: any?, change: [nskeyvaluechangekey : any]?, context: unsafemutablerawpointer?) {     guard context == &assetplaybackmanagerkvocontext else {         super.observevalue(forkeypath: keypath, of: object, change: change, context: context)         return     }      } else if keypath == #keypath(avplayer.rate) {         updatempnowplayinginforcentermetadata()     } } 

any thoughts?

update

i found solution though not perfect in case. in app have 2 view controller's. let's call them feedvc , playervc. feedvc has avplayer's playing muted. if click on 1 of them, playervc created , plays full video. if pause avplayer's in feedvc before going playervc "play/pause" button in nowplayinginfocenter works perfectly!

is there way make work without having pause videos in feedvc?

another issue elapsed time keeps counting if don't pause players in feedvc. seems if multiple players playing, play/pause button , elapsed time incorrect.

when setting dictionary nowplayinginfo want set mpnowplayinginfopropertyplaybackrate value appropriately. mpnowplayinginfocenter expecting either 1.0 (playing) or 0.0 (not playing) value double wrapped in nsnumber object. below find code how i'm setting nowplayinginfo in project.

func setnowplayingmediawith(song: susong, currenttime: double?) {      var playinginfo:[string: any] = [:]      if let title = song.title {         playinginfo[mpmediaitempropertytitle] = title     }      if let songid = song.id {         playinginfo[mpmediaitempropertypersistentid] = songid     }     if let artist = song.artist, let artistname = artist.name {         playinginfo[mpmediaitempropertyartist] = artistname     }      if let album = song.album, let albumtitle = album.title {         var artwork:mpmediaitemartwork? = nil         if let album = song.album, let artworkdata = album.artwork {             artwork = mpmediaitemartwork(boundssize: constants.library.albums.thumbsize, requesthandler: { (size) -> uiimage in                 return uiimage(data: artworkdata data)!             })         }         if artwork != nil {             playinginfo[mpmediaitempropertyartwork] = artwork!         }         playinginfo[mpmediaitempropertyalbumtitle] = albumtitle     }      var rate:double = 0.0     if let time = currenttime {         playinginfo[mpnowplayinginfopropertyelapsedplaybacktime] = time         playinginfo[mpmediaitempropertyplaybackduration] = song.duration         rate = 1.0     }     playinginfo[mpnowplayinginfopropertyplaybackrate] = nsnumber(value: rate)     playinginfo[mpnowplayinginfopropertymediatype] = nsnumber(value: mpnowplayinginfomediatype.audio.rawvalue)     mpnowplayinginfocenter.default().nowplayinginfo = playinginfo } 

in method passing song player has loaded. whenever user chooses play or pause call setnowplayingmediawith(song:currenttime:) update device's control console.

i keep track of currenttime (double) property of player. if there currenttime passed in means meant playing, set mpnowplayinginfopropertyplaybackrate 1.0 , set mpnowplayinginfopropertyelapsedplaybacktime currenttime. set current time start automatically playing in device's control console.

likewise, if there no currenttime passed have stopped or paused. in case set mpnowplayinginfopropertyplaybackrate 0.0 , not include mpnowplayinginfopropertyelapsedplaybacktime.

download app see in action.

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edit (answer comments)

"is there way make work without having pause videos in feedvc"

without seeing code difficult give definite answer. make sense though pause ongoing media before starting playervc's media.

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"the elapsed time keeps counting"

the elapsed time countdown elapsed time based on nstimer property on nowplayinginfocenter. timer stop when timers value has reached value set in mpmediaitempropertyplaybackduration, or when update mpnowplayinginfopropertyelapsedplaybacktime.

my suggestion write method "clears out" nowplayinginfocenter. method should set set of key values either 0.0 or nil respectively. call "clear out" method each time before play media in playervc. once play playervc, set nowplayinginfocenter key values in method pasted in answer set new values new playing media.