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查看info.plist文件，有关后台运行的所有mode
Required background modes：
1、App plays audio or streams audio/video using AirPlay
2、App registers for location updates
3、App provides Voice over IP services
4、App processes Newsstand Kit downloads
5、App communicates with an accessory
6、App communicates using CoreBluetooth
7、App shares data using CoreBluetooth
8、App downloads content from the network
9、App downloads content in response to push notifications
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原文地址：http://www.cnblogs.com/lpwlpw/p/4764547.html
