我有一个应用程序通过 UDP 连接到网络设备（在 LAN 中）并使用 GCDAsyncUdpSocket 侦听新消息。它在前台工作正常，但在后台无法响应。当我收到来自 UDP 的消息时，我想显示本地通知。请建议我们如何通过遵循 Apple 政策来实现这一目标。
谢谢和问候， 阿米特
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All sockets are set to sleep when the app is in background.
The option you have is to do Fetching Small Amounts of Content Opportunistically
In case your app is a VoIP app, you can keep a TCP socket live and the OS will inform you when data is received. This way you can set a "wake up" message to be sent over TCP and then use UDP for the actual data transfer.
于 2016-02-24T00:15:42.157 回答