xcode - Swift 2.0 中的远程控制 (MPNowPlayingInfoCenter)

Question

我正在尝试使用 Swift 制作一个广播应用程序。而且我在锁定屏幕上的 Remote 有问题。根本不起作用 - 屏幕上没有任何内容。来自 ViewController 的代码:

 override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    playButton.setTitle("Play", forState: UIControlState.Normal)
    if NSClassFromString("MPNowPlayingInfoCenter") != nil {
        let image:UIImage = UIImage(named: "logo_player_background")!
        let albumArt = MPMediaItemArtwork(image: image)
        var songInfo: NSMutableDictionary = [
            MPMediaItemPropertyTitle: "Radio Brasov",
            MPMediaItemPropertyArtist: "87,8fm",
            MPMediaItemPropertyArtwork: albumArt
        ]
        MPNowPlayingInfoCenter.defaultCenter().nowPlayingInfo = songInfo as [NSObject : AnyObject]
    }
    if (AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: nil)) {
        println("Receiving remote control events")
        UIApplication.sharedApplication().beginReceivingRemoteControlEvents()
    } else {
        println("Audio Session error.")
    }
}

即使修复了 MPNowPlayingInfoCenter 行，锁定屏幕上也没有任何显示。我做错了什么？

代码来自tutorial

Answer 1

好的，我已经解决了。问题出在 AVAudioSession 部分:

if (AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: nil)) {
    println("Receiving remote control events")
    UIApplication.sharedApplication().beginReceivingRemoteControlEvents()
} else {
    println("Audio Session error.")

我已经将其替换为:

try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, withOptions: [])
    try! AVAudioSession.sharedInstance().setActive(true)

Remote 正常工作:)