为什么 AFSoundManager 无法播放 mp3

playDisc.startRoatating()
    self.setAnchorPoint(CGPointMake(0.25, 0.13),forView: self.playNeedleImageView)
    self.playNeedlePlay()

    let urlMp3 = NSURL(string: "http://api.sport-x.cn/audio/qiannvyouhun.mp3")
    let avPlayer =  AVPlayer.init(URL: urlMp3!)
    avPlayer.play()


    //let urlMp3 = NSURL(string: "http://api.sport-x.cn/audio/qiannvyouhun.mp3")
    //let myAFSoundItem =  AFSoundItem.init(streamingURL: urlMp3!)
    //let player:AFSoundPlayback = AFSoundPlayback.init(item: myAFSoundItem!)
    //player.play()

    print("Player paly!")

}