无法转换类型为“MFSideMenuContainerViewController”的值

问题描述

使用 MFSideMenu，通过 Pods 安装，但不工作并崩溃。下面是我的代码：

SELECT
  partner_id,array_agg(product_qty ORDER BY order_date DESC) as product_qty_arr
FROM (
  SELECT
    td.partner_id,td.product_qty,td.order_date,row_number() OVER (PARTITION BY td.partner_id ORDER BY td.order_date DESC)
  FROM trip_delivery_sales_lines td
  JOIN trip_delivery_sales ts USING (partner_id)
  WHERE ts.route_id='152'  
    AND td.product_id='432'
) AS enumerated
WHERE row_number <= 2
GROUP BY partner_id

还有，

let storyBoard = UIStoryboard(name: "Main",bundle: nil) as UIStoryboard

let mfSideMenuContainer = storyBoard.instantiateViewController(withIdentifier: "MFSideMenuContainerViewController") as! MFSideMenuContainerViewController 

 // Crashing on above line.. because mfSideMenuContainer comes nil


    let dashboard = TabViewController()
    let leftSideMenuController = storyBoard.instantiateViewController(withIdentifier: "SideMenuViewController") as! SideMenuViewController
    mfSideMenuContainer.leftMenuViewController = leftSideMenuController
    mfSideMenuContainer.centerViewController = dashboard
    let appDelegate  = UIApplication.shared.delegate as! AppDelegate
    appDelegate.window?.rootViewController = mfSideMenuContainer

// 错误：

import MFSideMenu

解决方法

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