ios 只取消导航根控制器的LeftBarButtonItem

一劳永逸

只需在BaseViewController（viewController的基类）调用此方法即可

//取消导航根控制器的LeftBarButtonItem

- (void)cancelNavigationRootVCLeftBarButtonItem

{

    UITabBarController* tabBarController = (UITabBarController*)[UIApplication sharedApplication].keyWindow.rootViewController;

    UINavigationController* nav = (UINavigationController*)tabBarController.selectedViewController;

    if ([self.title isEqualToString:nav.title])

    {

        self.navigationItem.leftBarButtonItem = nil;

    }

    else

    {

        UIBarButtonItem *backBtnItem = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"backNavi"] style:UIBarButtonItemStylePlain target:self action:@selector(navigationBackAction)];

        self.navigationItem.leftBarButtonItem = backBtnItem;

        [self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];

    }

}

//返回上级页面

- (void)navigationBackAction

{

    [self.navigationController popViewControllerAnimated:YES];

}