从NSWindowController以编程方式提供视图控制器

Question

我正在使用用于macOS的Swave4，我可以用以下代码以编程方式显示另一个视图控制器：

@IBAction func showVC(_ sender: NSButton) {
    let vc = NSStoryboard(name: NSStoryboard.Name(rawValue: "Main"), bundle: nil).instantiateController(withIdentifier: NSStoryboard.SceneIdentifier(rawValue: "MyVC")) as! NSViewController
    self.presentViewController(vc, asPopoverRelativeTo: sender.bounds, of: sender, preferredEdge: .maxX, behavior: .transient)
}

现在，我想在NSWindowController上做同样的操作，但是我得到了下面的“错误”：

value of type 'WindowController' has no member 'presentViewController'

还有别的方法可以实现吗？

下一次尝试

   @IBAction func showVC(_ sender: NSToolbarItem) {
    let vc = NSStoryboard(name: NSStoryboard.Name(rawValue: "Main"), bundle: nil).instantiateController(withIdentifier: NSStoryboard.SceneIdentifier(rawValue: "MyVC")) as! NSViewController
self.contentViewController?.presentViewController(x, asPopoverRelativeTo: sender.view!.bounds, of: sender.view!, preferredEdge: .maxX, behavior: .transient)

    }        

该应用程序在第二行崩溃：

fatal error: unexpectedly found nil while unwrapping an Optional value

我检查如下：

print(sender.view?.bounds ?? "No bounds")
print(sender.view ?? "No view")

打印结果

No bounds
No view

但为什么？

Answer 1

试试这个：

let storyBoard = NSStoryboard(name: NSStoryboard.Name(rawValue: "Main"), bundle: nil)
let mainViewController : NSViewController = storyBoard.instantiateController(withIdentifier: NSStoryboard.SceneIdentifier(rawValue: "myVC")) as! NSViewController
self.contentViewController!.presentViewController(mainViewController, asPopoverRelativeTo: sender.bounds, of: sender, preferredEdge: .maxY, behavior: .transient)