如何在Swift中使用變量作為文件類型

Question

在下面的代碼中，如何在打開新的視圖控制器時使用變量controllerFileTypeIs動態選擇要使用的文件？

//MainViewController.swift

var variableForHomePage:HomeMenuViewController!
var variableForEntryViewController:EntryViewController!

var isHome:Bool = false
var controllerFileTypeIs:UIViewController?
var vcIdentifier:String = ""

override func viewDidLoad() {
    super.viewDidLoad()

    if isHome {
        controllerFileTypeIs = variableForHomePage
        vcIdentifier = "homeSB"
    } else {
        controllerFileTypeIs = variableForEntryViewController
        vcIdentifier = "entrySB"
    }

    var vc = storyboard?.instantiateViewControllerWithIdentifier(vcIdentifier) as! controllerFileTypeIs
    self.navigationController?.presentViewController(vc, animated: true, completion: nil)
    // Do any additional setup after loading the view.
}

Answer 1

由於您已經為控制器設置了情節提要標識符，因此無需鍵入任何內容，只需按照以下方式即可。

let vc = storyboard?.instantiateViewControllerWithIdentifier(vcIdentifier!)
self.navigationController?.presentViewController(vc!, animated: true, completion: nil)