有人知道怎么做吗？标准方法不起作用。我希望用户选择一首歌曲，然后将其保存以供下次加载应用程序时使用，但我似乎无法将其放入 NSUserDefaults。
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You need to iterate the collection to get the MPMediaItems.
MPMediaItem inherits from MPMediaEntity, which has a -valueForProperty: method. If you pass that method the MPMediaItemPropertyPersistentID constant, you'll get back an NSNumber that uniquely identifies the item. This is a value that's persistable across launches.
于 2011-02-07T03:41:35.347 回答