How to open Settings programmatically like in Facebook app?

On iOS 8 you can open Settings programmatically!

Here is the code:

- (void)openSettings
{
    BOOL canOpenSettings = (&UIApplicationOpenSettingsURLString != NULL);
    if (canOpenSettings) {
        NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        [[UIApplication sharedApplication] openURL:url];
    }
}

If your app has its own settings bundle, the settings will be opened showing your app’s settings. If your app does not have a setting bundle, the main settings page will be shown.