Troubles with MPRemoteCommandCenter - ios

Question

I have two troubles with MPRemoteCommandCenter:
1) When I change song, remote controls delete previous song image, make default song image, make next song image. I don't want to see default image. I spent a couple of time to find a solution.
2) When AVPlayer is live streaming sound, remote controls become non-active with circle arrows ( into circle arrow is number 15, what does it mean??).
Here is my code for playing sound:
public func playAVSound(trackName : String) -> String {
let path = _findPath(trackName: trackName);
if (path == "") {
return "getting url"
}
if (self.AVPlayerVC.player == nil) {
print("Init remote control events...")
UIApplication.shared.beginReceivingRemoteControlEvents()
let commandCenter = MPRemoteCommandCenter.shared()
commandCenter.nextTrackCommand.isEnabled = true
commandCenter.nextTrackCommand.addTarget(self, action:#selector(self.next))
commandCenter.previousTrackCommand.isEnabled = true
commandCenter.previousTrackCommand.addTarget(self, action:#selector(self.previous))
}
if (self.AVPlayerVC.player != nil && self.play_info.trackName == trackName) {
if (self.play_info.paused!) {
self.AVPlayerVC.player?.play()
self.updatePlayInfo(number: Global.PlayList.find_by_trackName(trackName: trackName), trackName: trackName, path: path, paused: false)
return "continue"
} else {
self.AVPlayerVC.player?.pause()
self.play_info.paused = true
return "pause"
}
}
let nsurl = NSURL(string: path)
if let url = nsurl {
print("Play AV from : \(url)")
let item = AVPlayerItem(url: url as URL)
if (self.AVPlayerVC.player?.currentItem == nil) {
self.AvPlayer = AVPlayer(playerItem: item)
self.AVPlayerVC.player = self.AvPlayer
self.AVPlayerVC.player?.automaticallyWaitsToMinimizeStalling = false
} else {
self.AvPlayer?.replaceCurrentItem(with: item)
}
NotificationCenter.default.addObserver(self, selector: #selector(self.playerDidFinishPlaying), name: .AVPlayerItemDidPlayToEndTime, object: item)
self.AVPlayerVC.player?.play()
self.updatePlayInfo(number: Global.PlayList.find_by_trackName(trackName: trackName), trackName: trackName, path: path, paused: false)
return "playing"
} else {
print ("Incorrect nsurl")
}
return "error"
}
private func _findPath (trackName: String) -> String {
let n = Global.PlayList.find_by_trackName(trackName: trackName)
var path = ""
if (n >= 0) {
let p_item = Global.PlayList.PlaylistItems[n];
if (!p_item.fromData!) {
if (p_item.playing_url == nil) {
NetLib.makeTrackUrl(trackName: trackName, closure: self.playAVSound)
} else {
path = p_item.playing_url!
}
} else {
path = NetLib.makePath(filename: p_item.filename!)
}
} else {
print("Error find_path: \(trackName) was not found in playlist")
}
return path
}
And here is code, that changes song
#objc private func previous() -> MPRemoteCommandHandlerStatus{
var n = self.play_info.number! - 1;
if (self.play_info.number == 0) {
n = Global.PlayList.size() - 1;
}
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "load"), object: nil)
_ = self.playAVSound(trackName: Global.PlayList.PlaylistItems[n].trackName!)
print("Previous song \(Global.PlayList.PlaylistItems[n].trackName!)")
return .success
}

Answer 1

I resolve trouble with controls while audio streaming. I play audio not from main thread, so remote controls work incorrect in that thread.