o modify the badge under ios8 you have to ask for permissions

    let settings = UIUserNotificationSettings(forTypes: UIUserNotificationType.Badge, categories: nil)

    UIApplication.sharedApplication().registerUserNotificationSettings(settings)

or in objC

UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];

[[UIApplication sharedApplication] registerUserNotificationSettings:settings];

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