CustomNavigationController.h

#import <UIKit/UIKit.h>

@interface CustomNavigationController : UINavigationController<UINavigationControllerDelegate>

@end

CustomNavigationController.m

#import "CustomNavigationController.h"

@interface CustomNavigationController()
{
    BOOL shouldIgnorePushingViewControllers;
}

@end

@implementation FBNavigationController

-(instancetype)init {
    self = [super init];
    self.delegate=self;
    
    return self;
    
}

-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (!shouldIgnorePushingViewControllers)
    {
        [super pushViewController:viewController animated:animated];
    }
    
    shouldIgnorePushingViewControllers = YES;
}

- (void)didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    shouldIgnorePushingViewControllers = NO;
}
@end