ios – AVPlayer在后台停止

我正在使用AVPlayer播放来自URL的音频.一切都按预期工作,直到APP进入后台或iPhone进入睡眠模式.

我怎样才能防止这种情况发生.

我已经添加到info.plist：

这是我的代码.

override func tableView(tableView: UITableView,didSELEctRowATindexPath indexPath: NSIndexPath) {

    let playTrackID = tracks[indexPath.row].trackID

    let urlString = url
    let url = NSURL(String: urlString)!

    avPlayer = AVPlayer(URL:url)

    avPlayer.play()

}

任何的想法？

更新：由@Danil Gontovnik解决

override func tableView(tableView: UITableView,didSELEctRowATindexPath indexPath: NSIndexPath) {

    let playTrackID = tracks[indexPath.row].trackID

    let urlString = url
    let url = NSURL(String: urlString)!

    do {

        avPlayer = AVPlayer(URL:url)

        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayBACk)
        try AVAudioSession.sharedInstance().setActive(true)

    }

    catch {

        print("Something bad happened. Try catching specific errors to narrow things down")
    }


    avPlayer.play()

var categoryError: NSError?
AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayBACk,error: &categoryError)

if categoryError != nil {
    // Handle error
}

var activeError: NSError?;
AVAudioSession.sharedInstance().setActive(true,error: &activeError)

if activeError != nil {
    // Handle error
}