Question

如何使用AVPlayer播放歌曲？这是我的代码。

    let song = filteredMusic[indexPath.row]
    let query = MPMediaQuery.songsQuery()
    let isPresent = MPMediaPropertyPredicate(value: song, forProperty: MPMediaItemPropertyTitle, comparisonType: .EqualTo)
    query.addFilterPredicate(isPresent)

    let result = query.items //only going to be one song

    if result!.count == 0 {
        print("not found")
        return
    }

    let url = result![0].assetURL // for some reason this is nil

    let item = AVPlayerItem(URL: url!)

    let player = AVPlayer(playerItem: item)
    player.play()

资产网址为零。怎么样？

Answer 1

感谢NKushwah的帮助！我出于几个原因发布了自己的答案。

    let song = filteredMusic[indexPath.row]
    let query = MPMediaQuery.songsQuery()
    let isPresent = MPMediaPropertyPredicate(value: song, forProperty: MPMediaItemPropertyTitle, comparisonType: .EqualTo)
    query.addFilterPredicate(isPresent)

    let result = query.collections

    if result!.count == 0 {
        print("not found")
        return
    }


    let controller = MPMusicPlayerController.systemMusicPlayer()
    let item = result![0]

    controller.setQueueWithItemCollection(item)
    controller.prepareToPlay()
    controller.play()
}

iPodMusicPlayer已被弃用！我改为使用systemMusicPlayer。
我的回答是在Swift。

Answer 2

有些MPMediaItelm只有他们的内容而不是URl，所以要玩这些你必须使用MPMusicPlayerController -

MPMusicPlayerController *controller = [MPMusicPlayerController iPodMusicPlayer];

MPMediaItem *item = result![0];

[controller setQueueWithItemCollection:collection];
[controller setNowPlayingItem:item];

[controller prepareToPlay];
[controller play];

applicationMusicPlayer不支持背景音乐。请改用MPMusicPlayerController＆＃39; iPodMusicPlayer。它与内置的iPod播放器共享状态，当您的应用程序进入后台时，音乐将继续播放。

在Swift中用AVPlayer播放歌曲

2 个答案: