在iOS7中添加了其他背景模式，您可以查看可用的背景模式.

In iOS7 additional background modes were added, you can check out the available background modes here. IMHO, if you misuse one of the background modes, the app will probably be rejected, saying that , i don't think silent push notifications were meant for: keep an iOS app in "Background" state by sending it a silent push notification every few seconds.

另一件事是，静默推送通知受到速率的限制，如此处，所以我不确定是否每隔几秒钟就会发送一次.

another thing is that silent push notifications are rate limited as described here, so i'm not sure if they will be sent every few seconds.

也许您可以使用其他后台服务

maybe you can use another background service