Apps that play audible content to the user while in the background, such as
a music player app （音频，如音乐播放）
Apps that keep users informed of their location at all times, such as a
navigation app （定位，如导航）
Apps that support Voice over Internet Protocol (VoIP) （联网的应用，如
网络电话）
Newsstand apps that need to download and process new content
（下载）
Apps that receive regular updates from external accessories
（定时更新）
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iOS 后台运行
原文：http://www.cnblogs.com/airy99/p/3724565.html
