Ios7 IOS：：如何获取MPMediaquery Songsquery艺术品

我用这个代码来获取艺术品，但这对我来说不是锻炼。这段代码有什么问题，建议我。 谢谢

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我假设您只想循环浏览音乐库中的所有歌曲，因此我认为不需要收藏：

MPMediaQuery *mySongsQuery = [MPMediaQuery songsQuery];

for (MPMediaItem *item in mySongsQuery.items) {
  if (![[item valueForProperty:MPMediaItemPropertyIsCloudItem]boolValue]) {

    CGSize artworkImageViewSize = CGSizeMake(40, 40);
    MPMediaItemArtwork *artwork = [song valueForProperty:MPMediaItemPropertyArtwork];
    UIImage *image = [artwork imageWithSize:artworkImageViewSize];

    if (image) {
      imgv_songImageView.image = image;
    } else {
      imgv_songImageView.image = [UIImage imageNamed:@"musicD-jpeg.png"];
    }
  }
}

---

我不确定您为什么要检查资产URL，但我已将其保留在其中。

这里我发布代码以获取曲目并按字母顺序排序。它是用swift3写的

    /// Get all the songs in the device and display in the tableview
///
func getAllSongs() {
    let query: MPMediaQuery = MPMediaQuery.songs()
    let allSongs = query.items

    allSongItems?.removeAll()

    guard allSongs != nil else {
        return
    }

    var index = 0
    for item in allSongs! {
        let pathURL: URL? = item.value(forProperty: MPMediaItemPropertyAssetURL) as? URL
        if pathURL == nil {
            print("@Warning!!! Track : \(item) is not playable.")
        } else {
            let trackInfo = SongItem()
            trackInfo.index = index
            trackInfo.mediaItem = item

            let title = item.value(forProperty: MPMediaItemPropertyTitle) as? String ?? "<Unknown>"
            let artistName = item.value(forProperty: MPMediaItemPropertyArtist) as? String ?? "<Unknown>"
            trackInfo.songName = title
            trackInfo.artistName = artistName

            trackInfo.isSelected = false
            trackInfo.songURL = item.value(forProperty: MPMediaItemPropertyAssetURL) as? URL
            allSongItems?.append(trackInfo)
            index += 1
        }
    }

    // Sort the songs alphabetically
    let sortedArray: [SongItem]? = allSongItems?.sorted {
        $0.songName!.localizedCompare($1.songName!) == .orderedAscending
    }
    allSongItems?.removeAll()
    if let arr = sortedArray {
        allSongItems?.append(contentsOf: arr)
    }


}

---

改为使用MPMediaItemPropertyIsCloudItem。它也提供相同的输出。你的确切意思是什么？即使设备上没有歌曲，您的所有歌曲都将获得0？尝试改变if语句，查看更新的答案。我得到了歌曲名和歌手名，这很好，但艺术品没有得到。

    /// Get all the songs in the device and display in the tableview
///
func getAllSongs() {
    let query: MPMediaQuery = MPMediaQuery.songs()
    let allSongs = query.items

    allSongItems?.removeAll()

    guard allSongs != nil else {
        return
    }

    var index = 0
    for item in allSongs! {
        let pathURL: URL? = item.value(forProperty: MPMediaItemPropertyAssetURL) as? URL
        if pathURL == nil {
            print("@Warning!!! Track : \(item) is not playable.")
        } else {
            let trackInfo = SongItem()
            trackInfo.index = index
            trackInfo.mediaItem = item

            let title = item.value(forProperty: MPMediaItemPropertyTitle) as? String ?? "<Unknown>"
            let artistName = item.value(forProperty: MPMediaItemPropertyArtist) as? String ?? "<Unknown>"
            trackInfo.songName = title
            trackInfo.artistName = artistName

            trackInfo.isSelected = false
            trackInfo.songURL = item.value(forProperty: MPMediaItemPropertyAssetURL) as? URL
            allSongItems?.append(trackInfo)
            index += 1
        }
    }

    // Sort the songs alphabetically
    let sortedArray: [SongItem]? = allSongItems?.sorted {
        $0.songName!.localizedCompare($1.songName!) == .orderedAscending
    }
    allSongItems?.removeAll()
    if let arr = sortedArray {
        allSongItems?.append(contentsOf: arr)
    }


}