Cocoa 不一致的视图层次结构

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

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

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")
    }
}

---

视图如何位于superview的子视图中，但superview属性设置不正确？在反编码/编码过程中是否会发生这种情况？要使其正确，我需要设置什么

下一个问题是，为什么在“查看调试”中正确显示

sub

，而在运行时需要它时却没有显示

编辑：（感谢Matt对此进行调查） 我的代码如下所示：

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

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")
    }
}

键是两个类

XIBDefined

和

XIBEmbedder

。前者可从XIB加载，后者可用于XIB。因此，后面嵌入的XIB使用

XIB定义

作为自定义类，嵌入的XIB使用

WelcomeCMapView

作为自定义类

---

在顶部显示代码的问题是后处理的一部分，这是在加载嵌入XIB的NSViewController中的

viewDidLoad（）

中执行的

“在反编码过程中会发生这种情况吗”这是个问题，好吧。笔尖加载相当复杂，连接起来需要一段时间。这在很大程度上取决于你什么时候说这句话。你能向后平移相机并显示更多的周围环境吗？还有，你怎么能不知道superview应该是什么，而实际上你刚刚说它是

v

？显然这里的代码不是你真正的代码。请在上下文中显示您的真实代码。帮助我们重现问题。

window

是否在

showxibDefinedPanel

的末尾发布？

XIBEmbedder.init中的
xibName
怎么可能不是
nil
（编码者：）

？XIB是否有一个顶级对象

WelcomeCMapView.init？（编码者：）

调用

super.init（名称：）

而不是

super.init？（编码者：）

并且不从XIB读取属性（superview，frame，…）。xibName在以前的版本中是@IBInspectable的，但我现在使用派生类。是的，只有一个XIB顶级对象。然而，当在Xcode视图中调试嵌入器的所有子视图时，整个事情变得非常神秘（对我来说），但不是在窗口中。这似乎不是AlphaValue或isHidden的问题。