APN后台刷新，正在设置AppDelegate.m

Question

我想在收到推送通知时触发数据提取。我知道这是在向用户显示通知之前发生的。现在我的 AppDelegate.m:

里有这个

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{

    if ( application.applicationState == UIApplicationStateInactive || application.applicationState == UIApplicationStateBackground  )
    {
        //restore push
        [[NSNotificationCenter defaultCenter] postNotificationName:@"appRestorePush" object:nil];

    }

    else {

        //push for when the app is open
        self.pushString = [[userInfo objectForKey:@"aps"] objectForKey:@"alert"];
        [[NSNotificationCenter defaultCenter] postNotificationName:@"appOpenPush" object:nil];

    }


}

这会控制应用程序的操作，具体取决于是在应用程序在前台打开时收到通知，还是通过推送通知打开应用程序。要添加对后台刷新的支持，我只需将此方法更改为 ?:

void didReceiveRemoteNotification (UIApplication application, NSDictionary userInfo, Action<UIBackgroundFetchResult> completionHandler)
{
  if([content-available]) {
    // fetch content methods here
    completionHandler (UIBackgroundFetchResult.NewData);
  }

 if ( application.applicationState == UIApplicationStateInactive || application.applicationState == UIApplicationStateBackground  )
        {
            //restore push
            [[NSNotificationCenter defaultCenter] postNotificationName:@"appRestorePush" object:nil];

        }

        else {

            //push for when the app is open
            self.pushString = [[userInfo objectForKey:@"aps"] objectForKey:@"alert"];
            [[NSNotificationCenter defaultCenter] postNotificationName:@"appOpenPush" object:nil];

        }
}

这是否适用于在显示推送之前获取数据，然后像以前一样处理从推送打开应用程序，或者是否有两种不同的方法，一种用于后台刷新，一种用于处理推送的打开方式？任何指针将不胜感激。谢谢！

Answer 1

首先，您的第二个代码块是 swift-Objective-C 的组合。所以我假设您使用 Objective-C.

进行开发

所以，相关方法如下：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))handler {
    if (application.applicationState == UIApplicationStateInactive) {
        // Application is inactive, fetch new data and call the completion handler.
        completionHandler(UIBackgroundFetchResultNewData);

    } else if (application.applicationState == UIApplicationStateBackground) {
        // Application is in background, fetch new data and call the completion handler.
        completionHandler(UIBackgroundFetchResultNewData);

    } else {
        // Application is active, so to what you need
        completionHandler(UIBackgroundFetchResultNewData);

    }
}

如果您在通知对象中发送 content-available = 1（在 aps 对象内），则不会向用户显示通知。此参数告诉 OS 您不想向用户显示新信息，而只想从您的服务器获取新数据。

如果您不发送此参数，那么 OS 会将其视为常规通知，并且只有在用户点击显示的通知后才会调用上述方法（除非应用处于活动状态, 并且不会显示通知，并且会立即调用此方法）。

APN后台刷新，正在设置AppDelegate.m

APN background refresh, setting up AppDelegate.m

objective-c

apple-push-notifications

ios