关于IQKeyboardManager 在iOS11导航栏消失的

问题：  升级到iOS11之后点击键盘时导航栏消失 如下图：

使用版本：pod 'IQKeyboardManager', '~> 5.0.6'

问题原因：IQKeyboardManager 在获取当前顶层控制器的时候获取到了tabBarController 

解决办法： 

找到IQUIView_Hierarchy.m   修改-(UIViewController *)topMostController方法  如下：即可

-(UIViewController *)topMostController{

    UIViewController *rootController = [UIApplication sharedApplication].keyWindow.rootViewController;

    if([rootController isKindOfClass:[UITabBarController class]]){

        UITabBarController *tabBarController = (UITabBarController *)rootController;

        UINavigationController *selectController = tabBarController.selectedViewController;

        UIViewController *viewController = (UIViewController *)selectController.visibleViewController;

        while (viewController.presentedViewController) {

            viewController = (UIViewController *)viewController.presentedViewController;

        }

        return viewController;

    }else if ([rootController isKindOfClass:[UINavigationController class]]) {

        UINavigationController *selectController = (UINavigationController *)rootController;

        return selectController.visibleViewController;

    }else if ([rootController isKindOfClass:[UIViewController class]]) {

            return rootController;

    }

    else{

        return nil;

    }

}

原文：https://blog.csdn.net/zaiwei123456/article/details/78796990