当我尝试呼叫sessionmanager.initialize()时，func sessionmanager(manager: SPTSessionmanager,didFailWith error: Error)和func sessionmanager(manager: SPTSessionmanager,didInitiate session: SPTSession)都不会被呼叫。

我有一个运行在AWS上的nodeJS服务器，用于令牌访问和刷新，并且我还尝试过运行本地Ruby服务器来获取令牌。无论如何，调用initialize()都无济于事。它确实失败还是成功，并且没有任何输出到控制台。我尝试过运行XCode调试器，好像程序只是跳过initialize。这是我完整的ViewController.swift文件，其中删除了不相关/私有的部分：

import UIKit
import Firebase

class LobbyAdminViewController: UIViewController,SPTSessionmanagerDelegate,SPTAppRemoteDelegate,SPTAppRemotePlayerStateDelegate  {
    fileprivate let SpotifyClientID = "client_id"
    fileprivate let SpotifyRedirecturi = URL(string: "redirect_url")!
    fileprivate var lastPlayerState: SPTAppRemotePlayerState?
    var refreshAPI = "token_server/refresh_token"
    var tokenAPI = "token_server/token"

    lazy var configuration: SPTConfiguration = {
           let configuration = SPTConfiguration(clientID: SpotifyClientID,redirectURL: SpotifyRedirecturi)
           configuration.playURI = ""
           configuration.tokenSwapURL = URL(string: tokenAPI)
           configuration.tokenRefreshURL = URL(string: refreshAPI)
           return configuration
       }()

       lazy var sessionmanager: SPTSessionmanager = {
           let manager = SPTSessionmanager(configuration: configuration,delegate: self)
           return manager
       }()

       lazy var appRemote: SPTAppRemote = {
           let appRemote = SPTAppRemote(configuration: configuration,logLevel: .debug)
           appRemote.delegate = self
           return appRemote
       }()

    override func viewDidLoad() {
        super.viewDidLoad()
        let random = Int(arc4random_uniform(900000) + 100000)
        lobbyCode = String(random)
        lobbyCodeLabel.text = lobbyCode
        var ref: DatabaseReference!
        ref = Database.database().reference()
        ref.child(lobbyCode).child("null").setvalue("null")
        let scope: SPTScope = [.appRemoteControl]
        if #available(iOS 11,*) {
            print("ios 11+")
            sessionmanager.initiateSession(with: scope,options: .clientOnly)
        } else {
            print("ios 11-")
            sessionmanager.initiateSession(with: scope,options: .clientOnly,presenting: self)
        }
    }

    func update(playerState: SPTAppRemotePlayerState) {
        print("Updating")
        lastPlayerState = playerState
        currentsongLabel.text = playerState.track.name
        currentArtistLabel.text = playerState.track.artist.name
        if playerState.isPaused {
            pausePlayButton.setBackgroundImage(UIImage(named: "play"),for: .normal)
        } else {
            pausePlayButton.setBackgroundImage(UIImage(named: "pause"),for: .normal)
        }
    }

    func fetchPlayerState() {
        print("Getting player state")
        appRemote.playerAPI?.getPlayerState({ [weak self] (playerState,error) in
            if let error = error {
                print("Error getting player state:" + error.localizedDescription)
            } else if let playerState = playerState as? SPTAppRemotePlayerState {
                self?.update(playerState: playerState)
            }
        })
    }

    @IBaction func onTap_pausePlayButton(_ sender: UIButton) {
        print("tapped")
        if let lastPlayerState = lastPlayerState,lastPlayerState.isPaused {
            appRemote.playerAPI?.resume(nil)
            print("Resuming")
        } else {
            appRemote.playerAPI?.pause(nil)
            print("Pausing")
        }
    }

    func sessionmanager(manager: SPTSessionmanager,didFailWith error: Error) {
        print("Bad init")
        print(error.localizedDescription)
    }

    func sessionmanager(manager: SPTSessionmanager,didRenew session: SPTSession) {
        print("Renewed")
    }

    func sessionmanager(manager: SPTSessionmanager,didInitiate session: SPTSession) {
        print("Trying to connect")
        appRemote.connectionParameters.accessToken = session.accessToken
        print(session.accessToken)
        appRemote.connect()
    }

    // MARK: - SPTAppRemoteDelegate

    func appRemoteDidEstablishConnection(_ appRemote: SPTAppRemote) {
        print("App Remote Connected")
        appRemote.playerAPI?.delegate = self
        appRemote.playerAPI?.subscribe(toPlayerState: { (success,error) in
            if let error = error {
                print("Error subscribing to player state:" + error.localizedDescription)
            }
        })
        fetchPlayerState()
    }

    func appRemote(_ appRemote: SPTAppRemote,didDisconnectWithError error: Error?) {
        lastPlayerState = nil
        print("Error connecting to app remote")
    }

    func appRemote(_ appRemote: SPTAppRemote,didFailConnectionAttemptWithError error: Error?) {
        lastPlayerState = nil
        print("Another error connectiong to app remote")
    }

    // MARK: - SPTAppRemotePlayerAPIDelegate

    func playerStateDidChange(_ playerState: SPTAppRemotePlayerState) {
        print("Player state changed")
        update(playerState: playerState)
    }

    // MARK: - Private Helpers

    fileprivate func presentAlertController(title: String,message: String,buttonTitle: String) {
        let controller = UIAlertController(title: title,message: message,preferredStyle: .alert)
        let action = UIAlertaction(title: buttonTitle,style: .default,handler: nil)
        controller.addaction(action)
        present(controller,animated: true)
    }

}

唯一触发的print()语句是viewDidLoad()中的“ ios 11” 我已经搜索了互联网上有同样问题的任何人，但空了。 我唯一能想到的可能是导致此问题的原因是iOS 13的已知运行时问题。此错误：

Can't end BackgroundTask: no background task exists with identifier 8 (0x8),or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.

。但是，即使XCode中的应用程序为空，也存在此问题，并且不会停止执行。