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我正在尝试用 Swift 制作一个广播应用程序。而且我在锁定屏幕上的遥控器有问题。根本不起作用 - 屏幕上什么都没有。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.")
    }
}

即使固定MPNowPlayingInfoCenter线路后，锁定屏幕上也不会出现任何内容。我做错了什么？

代码来自教程

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1 回答 1

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好的，我已经修好了。问题出在部分 AVAudioSession 上：

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

我已将其替换为：

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

遥控器正在工作:)

于 2015-11-27T23:46:48.610 回答