我的实践

1.在BaseViewController中，当viewWillAppear时，根据情况显示或隐藏导航栏
BaseViewController.h

#import "QqcBaseViewController.h"

@interface BaseViewController : QqcBaseViewController

#pragma mark - polymorphy
//是否需要显示导航栏
- (BOOL)isHideNavigationbar;

@end

BaseViewController.m

#import "BaseViewController.h"

@implementation BaseViewController

#pragma mark - polymorphy
//是否需要显示导航栏
- (BOOL)isHideNavigationbar {
    return NO;
}

#pragma mark - system framework
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    //是否显示导航栏
    BOOL isHideNavi = [self isHideNavigationbar];
    [self.navigationController setNavigationBarHidden:isHideNavi animated:YES];
}

@end

2.在SomeoneViewController中, 定制是否隐藏导航栏

- (BOOL)isHideNavigationbar {
    return YES;
}