远程推送为什么需要改配置文件?改用什么样的配置文件?
配置文件,证书,
这里的推送跟 NSNotificationCenter 的区别
user notifications:Local notifications and remote notifications----当程序运行在后台,可以通知用户
配置方式不用,服务不同
什么区别:broadcast notifications (managed by the NSNotificationCenter class ) and key-value observing notifications.
Local and Remote Notifications Contrasted对比