Enable/disable notifications in settings controller

Question

The IOS app that I'm building uses push notifications. Apple requires you to ask the user wether they want this or not, the first time they run the app:

if([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
[application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];
}

But, the user could change his/her mind during the use of the application and toggle notifications on or off in a settings controller by use of a UISwitch.

How can I catch the current notifications value and register/unregister the user from the notifications? This is what I have found on the internet but doesn't seem to work:

[[UIApplication sharedApplication] registerForRemoteNotifications];
[[UIApplication sharedApplication] unregisterForRemoteNotifications];
[[UIApplication sharedApplication] isRegisteredForRemoteNotifications];

Answer 1

You don't have to manually unregister the user from notifications if he changes the preferences, but you can check the status any time with this code

if ([[UIApplication sharedApplication]  respondsToSelector:@selector(isRegisteredForRemoteNotifications)]) {
    if ([[UIApplication sharedApplication]  isRegisteredForRemoteNotifications]){
        NSLog(@"Notifications Enabled iOS 8");
    } else {
        NSLog(@"Notifications Not Enabled iOS 8");
    }
} else {
    UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
    if (types & UIRemoteNotificationTypeAlert) {
        NSLog(@"Notifications Enabled iOS 7 or older");
    } else {
        NSLog(@"Notifications Not Enabled iOS 7 or older");
    }
}