访问iPhone OS 3.0中的BPM ID3标记

Question

有没有办法使用iPhone OS 3.0 SDK访问iPod上歌曲的BPM（每分钟节拍数）ID3标签？我在看

https://developer.apple.com/iphone/prerelease/library/documentation/MediaPlayer/Reference/MPMediaItem_ClassReference/Reference/Reference.html

我不明白：

NSString const MPMediaItemPropertyPersistentID;      / filterable */
NSString const MPMediaItemPropertyMediaType;         / filterable */
NSString const MPMediaItemPropertyTitle;             / filterable */
NSString const MPMediaItemPropertyAlbumTitle;        / filterable */
NSString const MPMediaItemPropertyPodcastTitle;      / filterable */
NSString const MPMediaItemPropertyArtist;            / filterable */
NSString const MPMediaItemPropertyAlbumArtist;       / filterable */
NSString const MPMediaItemPropertyGenre;             / filterable */
NSString const MPMediaItemPropertyComposer;          / filterable */
NSString *const MPMediaItemPropertyPlaybackDuration;
NSString *const MPMediaItemPropertyAlbumTrackNumber;
NSString *const MPMediaItemPropertyAlbumTrackCount;
NSString *const MPMediaItemPropertyDiscNumber;
NSString *const MPMediaItemPropertyDiscCount;
NSString *const MPMediaItemPropertyArtwork;
NSString *const MPMediaItemPropertyLyrics;
NSString const MPMediaItemPropertyIsCompilation;     / filterable */

Answer 1

如果您没有看到它，请提交一个Radar以包含它，或者可能要求API提供更常用的查询标记值的方法。