直接上代碼了：
寫在父類UINavigationController中的

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    
    if (@available(iOS 11.0, *)) {
        //關(guān)鍵適配
        UIImage *backButtonImage = [[UIImage imageNamed:@"nav_arrow"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        self.navigationBar.backIndicatorImage = backButtonImage;
        self.navigationBar.backIndicatorTransitionMaskImage = backButtonImage;
        [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(-kScreenWidth, 0)forBarMetrics:UIBarMetricsDefault];//UIOffsetMake(-kScreenWidth, 0)zh只要橫向偏移，縱向偏移返回圖標(biāo)也會偏移
    }
    else{
        //設(shè)置返回按鈕的圖片
        UIImage *backButtonImage = [[UIImage imageNamed:@"nav_arrow"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 0, 0)];
        [[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
        //將返回按鈕的文字position設(shè)置不在屏幕上顯示
        [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(-kScreenWidth, -kScreenHeight)forBarMetrics:UIBarMetricsDefault];
    }
    if (self.childViewControllers.count > 0) {
        //哥么你要想隱藏.那么必須在我push之前給我設(shè)置
        viewController.hidesBottomBarWhenPushed = YES;
    }
    //調(diào)用父類的方法
    [super pushViewController:viewController animated:animated];
}

-(void)back
{
    [self popViewControllerAnimated:YES];
}