iPod Library Access Programming Guide

　　《iPod Library Access Programming Guide》 学习记录

1. apple document： file:///Users/huoguanghua/Library/Developer/Shared/Documentation/DocSets/com.apple.adc.documentation.AppleiOS6.0.iOSLibrary.docset/Contents/Resources/Documents/index.html#documentation/Audio/Conceptual/iPodLibraryAccess_Guide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40008765-CH1-SW1

2. framework：MediaPlayer

3. 关键类：

　　MPMusicPlayerController   ipod中音乐的播放类

　　MPMediaPickerController  apple提供的选取音乐的类，带UI

　　MPMediaQuery　　查询ipod资源库

　　MPMediaPropertyPredicate 查询谓语

　　MPMediaItem　　音乐类

　　MPMediaItemArtwork  封面