Here are the Push Notification Check for iOS8 and iOS7.

iOS Push Notification Check

#define IS_iOS8 [[[UIDevice currentDevice] systemVersion] floatValue] >= 8?YES:NO

if (IS_iOS8) {
       UIUserNotificationType types = UIUserNotificationTypeSound | UIUserNotificationTypeBadge |                     UIUserNotificationTypeAlert;
            UIUserNotificationSettings *notificationSettings = [UIUserNotificationSettings settingsForTypes:types categories:nil];
            [[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];
}else{
         UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
          [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge |    UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
}

Delegate Methods

#ifdef __IPHONE_8_0
- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings {
    [application registerForRemoteNotifications];

}
#endif

#pragma marks- Device_Token
// Getting Device Token and saving it
- (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken
{
    _deviceToken = [[[[deviceToken description]
                      stringByReplacingOccurrencesOfString: @"<" withString: @""]
                     stringByReplacingOccurrencesOfString: @">" withString: @""]
                    stringByReplacingOccurrencesOfString: @" " withString: @""];
    NSLog(@"device token is : %@",_deviceToken);

    [self updateDeviceToken];
}

- (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error
{
    NSLog(@"Failed to get token, error: %@", error);
}

- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo
{

    NSString *info = [NSString stringWithFormat:@"%@",userInfo];
    NSLog(@"%@",info);
}