视图层次结构不一致

我尝试将基于.xb的自定义视图添加到另一个基于XIB的自定义视图中。 结果如下:

for sub in v.subviews {
      Swift.print(v.subviews) // returns array [sub]
      Swift.print(sub) // returns sub
      Swift.print(sub.superview) // return nil!
}

视图如何可以位于SuperView的子视图中,但未正确设置SuperView属性?在解/编码过程中会发生这种情况吗?为了让这个正确,我需要设置什么?

下一个问题是,为什么 sub 在“视图调试”中显示正确,但在运行时需要时才显示。

编辑: (感谢马特调查此事) 我的代码如下:

import AppKit
func showXIBDefinedInPanel(name: String, title: String ) {
    if let w = loadXIBDefined(name: name) {
        let c = NSViewController()
        c.view = w
        let window = NSPanel(contentViewController: c)
        window.isMovable = true
        window.collectionBehavior = .canJoinAllSpaces
        window.tabbingMode = .disallowed
        window.title = title
        window.styleMask = [ .titled,  .utilityWindow, .closable]
        window.makeKeyAndOrderFront(w)
    }
}

func loadXIBDefined(name: String) -> XIBDefined? {
    var topLevelObjects : NSArray?
    var result : XIBDefined? = nil
    if Bundle.main.loadNibNamed(NSNib.Name(rawValue: name), owner: nil, topLevelObjects: &topLevelObjects) {
        result = topLevelObjects!.first(where: { $0 is XIBDefined }) as? XIBDefined
    }
    return result
}

///used to embed a XIBDefined into another XIB
@IBDesignable class XIBEmbedder : NSView {

    // Our custom view from the XIB file
    var view: NSView!
    var xibName: String!

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        view = loadXIBDefined(name: xibName)
        addSubview(view)
        self.frame = view.frame
    }

    required init?(coder decoder: NSCoder) {
        super.init(coder: decoder)
        view = loadXIBDefined(name: xibName)
        addSubview(view)
        self.frame = view.frame
    }

    init(name: String) {
        self.xibName = name
        super.init(frame: NSZeroRect)
        view = loadXIBDefined(name: xibName)
        addSubview(view)
        self.frame = view.frame
    }
}

///used as class for XIB based Custom Views
@IBDesignable class XIBDefined: NSView {

    ///I had an issue with an oddly moved frame, so I hard coded a fix
    override func setFrameOrigin(_ newOrigin: NSPoint) {
        super.setFrameOrigin(NSZeroPoint)
        needsDisplay = true
    }
}


@IBDesignable class WelcomeCMapView : XIBEmbedder {
    init() {
        super.init(name: "Welcome Concept Maps")
    }

    required init?(coder decoder: NSCoder) {
        super.init(name: "Welcome Concept Maps")
    }
}

关键是这两类 XIBDefined 和 XIBEmbedder 是的。前者可以从xib加载,后者可以在xib中使用。因此,后面的嵌入式xib使用 XIB定义 作为自定义类,嵌入xib有一个 WelcomeCMapView 作为自定义类。

上面显示代码的问题是后处理的一部分,它在内部执行。 viewDidLoad() 从 NSViewController 加载嵌入xib。