Ios 无法强制转换类型为'；MFSideMenuContainerViewController'；

使用MFSideMenu，通过吊舱安装，但不工作和崩溃。下面是我的代码：

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

而且

//错误：

  Could not cast value of type 'MFSideMenuContainerViewController' (0x105b67020) to 'MFSideMenuContainerViewController'

---

如果

让mfSideMenuContainer=storyBoard.InstanceViewController（标识符为：“MFSideMenuContainerViewController”）为！MFSideMenuContainerViewController

导致崩溃，这意味着

情节提要。InstanceEviewController（标识符为：“MFSideMenuContainerViewController”）

要么为零，要么不是

MFSideMenuContainerViewController

，是哪一个？已检查是否相同。但我想提到的是，这个故事板是从不同的项目复制的。但是这不应该影响打印的输出（“VC:\（storyBoard.InstanceEviewController（带有标识符：“MFSideMenuContainerViewController”））。输出结果是什么？不清楚您是否正确拥有具有该Id的VC，是否正确设置了它的类。nil它在控制台上打印，使用断点选中scheck或uncheck从模块继承目标？

  Could not cast value of type 'MFSideMenuContainerViewController' (0x105b67020) to 'MFSideMenuContainerViewController'