【发布时间】：2020-03-06 03:33:43
【问题描述】：
当我尝试调用 sessionManager.initialize() 时，func sessionManager(manager: SPTSessionManager, didFailWith error: Error) 和 func sessionManager(manager: SPTSessionManager, didInitiate session: SPTSession) 都没有被调用。
我有一个在 AWS 上运行的 nodeJS 服务器用于令牌访问和刷新，我还尝试运行一个本地 Ruby 服务器来获取令牌。无论如何，拨打initialize() 什么都不做。它确实失败或成功，并且没有任何内容输出到控制台。我试过运行 XCode 调试器，似乎程序只是跳过了initialize。这是我完整的 ViewController.swift 文件，其中删除了无关/私有部分：
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”
我已经在互联网上搜索了任何有同样问题的人，但都一无所获。
我能想到的唯一可能导致此问题的是 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.
每次应用程序发送到后台时触发（即当应用程序重定向到 spotify 以进行身份验证时）。但是，即使 XCode 中的空白应用程序也存在此问题，并且不会停止执行。
【问题讨论】：
-
顺便说一句：你不再需要
arc4random_uniform- developer.apple.com/documentation/swift/int/2995648-random -
感谢您指出这一点，我一定会切换这个
-
嗯...您是否尝试过在 Xcode 建议的位置设置断点？见forums.developer.apple.com/thread/22836
-
是的，我有。不幸的是，它没有产生任何结果