applicationQueuePlayer 和 applicationMusicPlayer 之间有什么区别？

Question

Apple 文档中说

The application queue music player provides more functionality and greater control over the music played than the application music player.

但是那是什么控件和功能？

Answer 1

根据声明，MPMusicPlayerController继承自NSObject，并且 MPMusicPlayerApplicationController 继承自 MPMusicPlayerController.

所以，很明显，NSObject => MPMusicPlayerController => MPMusicPlayerApplicationController 然后，MPMusicPlayerApplicationController拥有MPMusicPlayerController的所有功能， More func是Changing the Queue Contents添加的，提供了两种方法。 总的来说，你只要使用MPMusicPlayerController就可以做很多事情，希望能帮到你。