Question

我遇到问题在某些设备上处理通知有效负载。我正在通过Parse Cloud功能向我的用户发送推送通知。

我正在使用以下方法捕获通知并存储其有效负载，以便用户可以在专用视图中查看所有收到的通知。在我的个人设备上，我总是收到通知并且在我朋友的设备上正确保存，但是通知到了，但如果应用程序在后台，则不保存有效负载，而如果应用程序在前台，则保存有效负载。

这可能是设备本身的问题吗？或者也许与电话提供商有关的事情（我有h3g，他有沃达丰）？

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler{
// Parse push handler will show a UIAlertView
[PFPush handlePush:userInfo];

if (application.applicationState == UIApplicationStateInactive) {

    // tha app is inactive, transitioning to or from the background        
    completionHandler(UIBackgroundFetchResultNoData);

} else if (application.applicationState == UIApplicationStateBackground) {

    // tha app is running in background
    // add the notification to the notificationsArrayRecord
    NSDate *now = [[NSDate alloc]init];
    NSDictionary *aps = userInfo[@"aps"];
    NSString *alertMessage = aps[@"alert"];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSMutableArray *notificationsArrayRecord = [[defaults arrayForKey:@"notificationsArrayRecord"] mutableCopy];
    [notificationsArrayRecord addObject:@[now,alertMessage]];
    [defaults setValue: notificationsArrayRecord forKey:@"notificationsArrayRecord"];

    // update the notifications counter
    NSInteger pushCount = [[NSUserDefaults standardUserDefaults] integerForKey: @"pushCount"];
    pushCount ++;
    [defaults setInteger: pushCount forKey:@"pushCount"];
    [defaults synchronize];

    completionHandler(UIBackgroundFetchResultNewData);
} else {        
    // the app is running in foreground

    // add the notification to the notificationsArrayRecord
    NSDate *now = [[NSDate alloc]init];
    NSDictionary *aps = userInfo[@"aps"];
    NSString *alertMessage = aps[@"alert"];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSMutableArray *notificationsArrayRecord = [[defaults arrayForKey:@"notificationsArrayRecord"] mutableCopy];
    [notificationsArrayRecord addObject:@[now,alertMessage]];
    [defaults setValue: notificationsArrayRecord forKey:@"notificationsArrayRecord"];

    // update the notifications counter
    NSInteger pushCount = [[NSUserDefaults standardUserDefaults] integerForKey: @"pushCount"];
    pushCount ++;
    [defaults setInteger: pushCount forKey:@"pushCount"];
    [defaults synchronize];

    completionHandler(UIBackgroundFetchResultNewData);

    // refresh the menu buttons and the notification counter
    [[NSNotificationCenter defaultCenter] postNotificationName:@"appDidReceiveNotificationWhileActive" object:nil];
   }
  }

Answer 1

我想问题是你如何处理应用程序状态UIApplicationStateInactive。在这种情况下，您不存储信息。您还应该将它存储在这种情况下，因为当您收到通知时，应用程序显然可以处于此状态。这也解释了为什么它有时会失败。另请参阅this question，当设备收到通知时，有时会说明应用状态为UIApplicationStateInactive。

您应该重构代码以在所有情况下存储数据：

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler{
    // Parse push handler will show a UIAlertView
    [PFPush handlePush:userInfo];

    // add the notification to the notificationsArrayRecord     
    NSDate *now = [[NSDate alloc]init];
    NSDictionary *aps = userInfo[@"aps"];
    NSString *alertMessage = aps[@"alert"];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSMutableArray *notificationsArrayRecord = [[defaults arrayForKey:@"notificationsArrayRecord"] mutableCopy];
    [notificationsArrayRecord addObject:@[now,alertMessage]];
    [defaults setValue: notificationsArrayRecord forKey:@"notificationsArrayRecord"];

    // update the notifications counter
    NSInteger pushCount = [[NSUserDefaults standardUserDefaults] integerForKey: @"pushCount"];
    pushCount ++;
    [defaults setInteger: pushCount forKey:@"pushCount"];
    [defaults synchronize];

    if (application.applicationState == UIApplicationStateInactive) {
        // the app is inactive, transitioning to or from the background        
        completionHandler(UIBackgroundFetchResultNoData);
    } else if (application.applicationState == UIApplicationStateBackground) {
        // the app is running in background
        completionHandler(UIBackgroundFetchResultNewData);
    } else {        
        // the app is running in foreground
        completionHandler(UIBackgroundFetchResultNewData);

        // refresh the menu buttons and the notification counter
        [[NSNotificationCenter defaultCenter] postNotificationName:@"appDidReceiveNotificationWhileActive" object:nil];
    }
}

<强>更新我不确定在completionHandler(UIBackgroundFetchResultNoData)中调用applicationState（不知道这对什么有用），但也许你需要调用completionHandler(UIBackgroundFetchResultNewData)来代替，在这种情况下，也可以存储数据

另外，请确保您已正确配置所有内容以在后台接收通知，[请参阅]答案（https://stackoverflow.com/a/31450953/594074）。

推送通知有效负载未保存在某些设备上

1 个答案: