How to update the badge number in IOS notification? - ios

Question

I recently use the Amazon SNS to push notification for my IOS app.
It works well, the only problem I have encountered is when I receive the notification , the badge number will not be updated, here is how I implement:
First I follow the example here
https://aws.amazon.com/articles/9156883257507082
, I extract only the SNS part that means I only alter the appdelegate in my app. Here is the example code from the tutorial.
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
application.applicationIconBadgeNumber = 0;
NSString *msg = [NSString stringWithFormat:#"%#", userInfo];
NSLog(#"%#",msg);
[[Constants universalAlertsWithTitle:#"Push Notification Received" andMessage:msg] show];
}
-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//Register for push notification
application.applicationIconBadgeNumber = 0;
[[UIApplication sharedApplication] registerForRemoteNotificationTypes:
(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
if(launchOptions!=nil){
NSString *msg = [NSString stringWithFormat:#"%#", launchOptions];
NSLog(#"%#",msg);
[[Constants universalAlertsWithTitle:#"Push Notification Received" andMessage:msg] show];
}
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
Message_BoardViewController *boardViewController = [Message_BoardViewController new];
UINavigationController *navigationController = [UINavigationController new];
navigationController.navigationBar.translucent = NO;
[navigationController pushViewController:boardViewController animated:NO];
[boardViewController release];
self.window.rootViewController = navigationController;
[navigationController release];
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackOpaque];
[self.window makeKeyAndVisible];
// Logging Control - Do NOT use logging for non-development builds.
#ifdef DEBUG
[AmazonLogger verboseLogging];
#else
[AmazonLogger turnLoggingOff];
#endif
[AmazonErrorHandler shouldNotThrowExceptions];
return YES;
}
As you can see, the badge number will always become 0, and also I found the JSON incoming notification from SNS is without badge field but only has alert field, didReceiveRemoteNotification is not call when the app is at background too.
So , how can I modify the code to update the badge? Thanks for kindly help.