iPhone客户端开发笔记（八）

客户端稳定性和提升用户体验。

1，掌握app的运行状态

这是官方文档中关于Application State的详细描述：

https://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html\

2，尝试在后台接收报警信息的尝试：后台运行。

这是官方文档中关于后台和多任务的详细描述：

https://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html

经研究发现后台运行在iOS下限制很多，iOS只针对几类功能提供了后台执行能力：播放音乐、GPS导航、跟外围设备通信、蓝牙通信等。所以不太适合我们这个应用。

3，尝试使用Push Notification接收报警信息：

这是对Remote Push Notification机制的概述：

https://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Introduction/Introduction.html

要实现push notification，需要以下三部分知识：

a，Scheduling, Registering, and Handling Notifications

https://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/IPhoneOSClientImp/IPhoneOSClientImp.html#//apple_ref/doc/uid/TP40008194-CH103-SW1

b，Apple Push Notification Service

https://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/ApplePushService/ApplePushService.html#//apple_ref/doc/uid/TP40008194-CH100-SW9

c，Provisioning and Development

https://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/ProvisioningDevelopment/ProvisioningDevelopment.html#//apple_ref/doc/uid/TP40008194-CH104-SW1

d，Provider Communication with Apple Push Notification Service

https://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CommunicatingWIthAPS/CommunicatingWIthAPS.html#//apple_ref/doc/uid/TP40008194-CH101-SW1

最终决定使用这种方式实现报警信息推送。

4，这是stackoverflow中关于如何实现Provider server的问答：

http://stackoverflow.com/questions/7791549/how-to-create-a-server-for-apns-for-iphone

That‘s all。