How to handle remote notification in background IOS 8? [closed]

问题

I've searched the answer for 2 days, and still not getting the answer. The requirement is our server sends a APNS to my APP with some data, and I should right the data into userDefaults for further use.

what I've done so far is making the didReceiveRemoteNotification work. So that means when the APP is in background, I can only get the saving process done when the alert is tapped by the user.

I'm trying to use didReceiveRemoteNotification:fetchCompletionHandler. but I really can't get the idea how it works. And the delegate never get called? I read the apple developer docs still no help. Please can someone give me a example code. and especially tell me exactly the APNS content would be. Many thanks

回答1:

When app is in background you cant do anything with push notifications. You can do further operations when user taps on it. I also faced same issues but I had to took API into consideration for this, what we did

We created one API
This will call every time when your app comes to foreground
Then it will check for particular notification is READ or UNREAD and then with respect to that response, I changed flags of NSUserDefaults

We can have multiple scenarios to handle such situations.

回答2:

I've found the solution, here is the code:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//push notification
UIUserNotificationSettings *settings=[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge|UIUserNotificationTypeSound|UIUserNotificationTypeAlert categories:nil];
[application registerUserNotificationSettings:settings];
[application registerForRemoteNotifications];
return YES;
}

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
//because our sever guy only wants a string, so i send him a string without brackets
NSString * token = [[[deviceToken description] stringByReplacingOccurrencesOfString: @"<" withString: @""] stringByReplacingOccurrencesOfString: @">" withString: @""];
//because they only want the token to be uploaded after user login, so i save it in a variable.
VAR_MANAGER.APNSToken = token;
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(nonnull NSDictionary *)userInfo fetchCompletionHandler:(nonnull void (^)(UIBackgroundFetchResult))completionHandler{
NSLog(@"userInfo: %@", userInfo);
if (userInfo != nil) {
    [self updateNotificationData:userInfo];
}
completionHandler(UIBackgroundFetchResultNoData);
}

- (void)updateNotificationData: (NSDictionary *)userInfo {
NSMutableArray *notificationDataArray = [NSMutableArray arrayWithArray:VAR_MANAGER.notificationDataArray];
//the app will add the userInfo into the array silently, but when user clicked on the notification alert, the delegate will run again, so I check if the previous added entry is the same as current one.
for (int i = 0; i < notificationDataArray.count; i++) {
    if ([userInfo isEqualToDictionary:notificationDataArray[i]]) return;
}
[notificationDataArray addObject:userInfo];
VAR_MANAGER.notificationDataArray = notificationDataArray;
}

VAR_MANAGER is a NSObject I used to store all the global variables, which uses KVO, when value change, it will store in the userDefault.

//here is the userInfo i obtained from push notification, remember the content-available = 1, that is the most important part
{
    aps =         {
        alert = success;
        badge = 1;
        "content-available" = 1;
        sound = default;
    };
    status = 1;
    "time_stamp" = "1466407030.006493";
}

Finally thanks to all the answer providers.

来源：https://stackoverflow.com/questions/37914643/how-to-handle-remote-notification-in-background-ios-8

标签

ios

objective-c

ios8

push-notification