iOS的UIBackgroundMode远程通知不上4G工作 [英] iOS UIBackgroundMode remote-notification doesn't work on 4G

问题描述

我测试推送通知与内容可用= 1，他们似乎并不在后台交付给应用程序，除非使用Wi-Fi。

I'm testing push notifications with content-available=1, and they don't seem to be delivered to the app in the background unless on Wi-Fi.

我在推通知处理程序的开始一个简单的日志语句：

I have a simple log statement at the beginning of the push notification handler:

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
                                                    fetchCompletionHandler:(void (^)   (UIBackgroundFetchResult))completionHandler {

    NSLog(@"Notification received: %@", userInfo);
    completionHandler(UIBackgroundFetchResultNewData);
}

下面是我的测试：

1. 运行应用程序，那么preSS home键放在后台的应用程序。


2. 发送推送通知与内容可用= 1


3. 手表控制台日志

在无线网络连接，控制台日志显示通知。如果我去设置和关闭无线网络连接，切换到4G，通知不再出现在日志中（尽管它们在屏幕的上方滑动，所以我知道他们正在被送到）。

On Wi-Fi, the console log shows the notification. If I go to Settings and turn off Wi-Fi, switching to 4G, notifications no longer appear in the log (although they do slide in at the top of the screen, so I know they are being delivered).

有没有崩溃的日志记录，如果我手动点击其上的通知记录。此外，如果我在调试X code中的应用程序不会出现此问题。 （即，如果我以x code调试我的应用程序将获得4G的后台通知）。任何人都经历这种行为？还是我做错了什么？

There are no crash logs, and the notification is logged if I manually tap on it. Furthermore, this problem does NOT occur if I am debugging the app in Xcode. (i.e., if I am debugging in Xcode, the app will receive the notification in the background on 4G). Has anyone else experienced this behavior? Or am I doing something wrong?

修改：
具体而言：根据我的测试，如果下列条件为真，那么远程通知委托上述方法将不会被调用：

EDIT: To be specific: according to my tests, if the following conditions are true, then the remote notification delegate method above will not be called:

1. 应用程序在后台运行


2. Phone是LTE网络，没有连接到Wi-Fi
在

3. 应用是不是在X code调试运行


4. 的通知与内容可用= 1是通过手机收到

不过，如果条件2被删除（即手机连接到Wi-Fi），则该处理器将被调用。

However if condition 2 is removed (i.e., the phone is connected to Wi-Fi), then the handler will be called.

推荐答案

根据从这里评论者的反馈和多个设备上反复试验，这似乎是在iOS上的错误（或预期的行为）。

Based on feedback from a commenter here and repeated testing on multiple devices, this appears to be a bug (or intended behavior) on iOS.

这篇关于iOS的UIBackgroundMode远程通知不上4G工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！