APNS:didReceiveRemoteNotification:fetchCompletionHandler 在应用程序处于后台时没有运行(除非 xcode 正在调试) [英] APNS: didReceiveRemoteNotification:fetchCompletionHandler did not run when app is in background (unless xcode is debugging)

问题描述

我在运行 iOS 8.1 的 iPad 2 中遇到了有关 APNS 的问题.我在谷歌上搜索了几天并尝试了我能找到的所有解决方案.但是我似乎无法解决这个问题.

I have this problem regarding APNS in my iPad 2 running iOS 8.1 . I searched on Google for a few days and tried every solution that I can find. However I cant seem to solve this problem.

我做了什么:

1. 启用的功能:远程通知、后台获取
2. 我在 aps 负载中有content-available = 1".
3. 我在 didReceiveRemoteNotification:fetchCompletionHandler 中使用了 NSLog() 以便我可以在设备日志中清楚地看到该方法是否被触发

我想做什么:

我想在后台收到 APNS 时执行网络请求.我相信我可以使用 beginBackgroundTaskWithExpirationHandler 和其他东西很好地处理那部分.但是，经过调查，我发现问题是由于 didReceiveRemoteNotification:fetchCompletionHandler 在应用程序处于后台状态时未运行.

I want to perform network request when I receive the APNS in background. I believe I can handle that part well using beginBackgroundTaskWithExpirationHandler and stuff. However, going down the investigation I found that the problem is due to didReceiveRemoteNotification:fetchCompletionHandler not been run when app is in background state.

问题:

didReceiveRemoteNotification:fetchCompletionHandler 可以在应用程序处于前台时触发.但它仅在 xcode 仍在调试应用程序时在后台触发.这意味着如果我拔掉电缆(调试会话结束)，它就不能再触发了.如果我重新插上它也是一样的.没有反应.

didReceiveRemoteNotification:fetchCompletionHandler can trigger when app is in foreground. But it is ONLY triggered in background when xcode is still debugging the app. Which means if I unplug the cable (the debugging session is over), it cannot trigger anymore. Same thing if I replug it back in. No response.

但是，与此同时，我仍然可以收到带有警报正文和声音的 APNS(尽管该方法仍未触发)，正如我在设备日志中看到的那样.

However, at the same time, I can still receive APNS with alert body and sound (although the method is still not triggered) as I see in the Device Log.

我尝试了无声"推送通知的所有组合:声音 = ""、警报 = "" 等.但似乎没有任何效果.这里的专业人士有什么帮助吗?

I tried every combination of "silent" push notification: sound = "", alert = "", etc. But nothing seems to work. Any help from the pros here?

谢谢.

推荐答案

仔细检查后台应用刷新是否打开.我在旅行时将其关闭后遇到了一段时间.

Double check that Background App Refresh is turned on. I ran into this for a while after turning it off while traveling.

此外，您不需要在 didReceiveRemoteNotification:fetchCompletionHandler 中使用后台任务，因为它已经在后台运行.只需确保在完成网络请求后调用适当的完成处理程序即可.

Also, you shouldn't need to use a background task inside of the didReceiveRemoteNotification:fetchCompletionHandler as it is already running in the background. Just make sure to call the appropriate completion handler when you're done with your network request.

最后，didReceiveRemoteNotification:fetchCompletionHandler 不会在常规(非静默)通知上被调用，因为常规通知不会唤醒您的应用并执行代码.

Finally, didReceiveRemoteNotification:fetchCompletionHandler will not be called on a regular (non-silent) notification because regular notifications do not wake your app and execute code.

另一个需要检查的奇怪而晦涩的事情是通知框架数据中的优先级 - 指向 Apple 文档的链接 - 用于优先级"的命令 F 以获取详细信息.当我这样做时，我的构建通知的 Ruby gem 默认使用 10，如果您只使用内容可用"而没有其他任何内容，则应该是不允许的.工作很忙，我从来没有用 5 的优先级来测试这个，但它可能会有所帮助.

Another weird obscure thing to check is the priority in the notification frame data - link to Apple Documentation - command F for 'priority' for the details. When I was doing this my Ruby gem that built the notification was using 10 by default, which is supposedly not allowed if you are only using 'content-available' and nothing else. Things got busy at work and I never got to test this using a priority of 5, but it may help.

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