Send Data from ViewController to ContainerViewController through Segue's Identifier

gistFile.m

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
  if ([[segue identifier] isEqualToString:@"NextVC"]) {
    self.value = 1;
    ViewController *controller = [segue destinationViewController];
    controller.data = self.value;
  }
}
 
// In NextViewController.h
@property (nonatomic, strong) NSDictionary *data; 

gistfile1.m

// If there is a Navigation Controller in Between
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
  if ([segue.identifier isEqualToString:@"NextVC"]) {
    self.value = 1;
    UINavigationController *navController = segue.destinationViewController;
    RegisterViewController *controller = [navController viewControllers][0];
    controller.data = self.value;
  }
}