问题

我正在开发一个iOS应用，以集成MusicKit来从用户的音乐库中获取用户的歌曲。
由于我对Swift和原生iOS开发都很陌生，所以我很难理解苹果的文档。

我已经能够从库中获取用户的专辑和歌曲，但其属性有限，例如
Song(id: "i.GEGNo8Xh0EMr8Ov", title: "Walk On Water (feat. Beyoncé)", artistName: "Eminem")

我需要获取歌曲的其他属性，例如ISRC、流派、时长等。我应该如何获取其他属性？以下是我用于用户音乐的Swift代码。

我正在遵循苹果的这个文档。

if #available(iOS 15.0, *) {
    let status = await MusicAuthorization.request()

    switch status {
    case .authorized:
    do {
        let playlistRequest = MusicLibraryRequest<Song>()
        var playlistResponse = try await playlistRequest.response().items[1]
        print(playlistResponse)
        print(playlistResponse.artistName)
    } catch {
        /* 处理错误 */
    }
}

<details>
<summary>英文:</summary>

I am developing and IOS app to integrate `MusicKit` to get User songs from their Music Library.
Since I am new to Swift and Native IOS development, it is quite difficult for me to understand the Apple Documentation.

I have able to get users Album, Songs, from library but It&#39;s properties are limited to 
**`Song(id: &quot;i.GEGNo8Xh0EMr8Ov&quot;, title: &quot;Walk On Water (feat. Beyonc&#233;)&quot;, artistName: &quot;Eminem&quot;)`**

I need to get other properties of songs such as ISRC, genre, duration etc. What can I do to get the other properties? Below mentioned is my Swift Code for User Music.

I&#39;m following [this docs from Apple][1].

```swift
if #available(iOS 15.0, *) {
    let status = await MusicAuthorization.request()

    switch status {
    case .authorized:
    do {
        let playlistRequest = MusicLibraryRequest&lt;Song&gt;()
        var playlistResponse = try await playlistRequest.response().items[1]
        print(playlistResponse)
        print(playlistResponse.artistName)
    } catch {
        /* handle error */
    }
}

答案1

得分: 2

用户的音乐库中的歌曲类型信息有限，如名称、艺术家和ID。

你可以尝试从Apple Music目录中获取相应的歌曲：

let songsLibraryRequest = MusicLibraryRequest<Song>()
let songsLibraryResponse = try await songsLibraryRequest.response()

guard let librarySong = songsLibraryResponse.items.first else { return }

print(librarySong)

let url = URL(string: "https://api.music.apple.com/v1/me/library/songs/\(librarySong.id.rawValue)/catalog")

guard let url else { return }

let request = MusicDataRequest(urlRequest: URLRequest(url: url))
let response = try await request.response()

let catalogSongs = try JSONDecoder().decode(MusicItemCollection<Song>.self, from: response.data)

guard let catalogSong = catalogSongs.first else { return }

print(catalogSong)
print(catalogSong.artistName)
print(catalogSong.duration)
print(catalogSong.isrc)

let songsLibraryRequest = MusicLibraryRequest<Song>()
let songsLibraryResponse = try await songsLibraryRequest.response()

guard let librarySong = songsLibraryResponse.items.first else { return }

print(librarySong)

let url = URL(string: "https://api.music.apple.com/v1/me/library/songs/\(librarySong.id.rawValue)/catalog")

guard let url else { return }

let request = MusicDataRequest(urlRequest: URLRequest(url: url))
let response = try await request.response()

let catalogSongs = try JSONDecoder().decode(MusicItemCollection<Song>.self, from: response.data)

guard let catalogSong = catalogSongs.first else { return }

print(catalogSong)
print(catalogSong.artistName)
print(catalogSong.duration)
print(catalogSong.isrc)

答案2

得分: 0

使用 with(_:) 实例方法

let detailedSong = try await song.with([.genres])
guard let genres = detailedSong.genres else { return }

更多详情请参考 这里

let detailedSong = try await song.with([.genres])
guard let genres = detailedSong.genres else { return }