NSOutlineView绑定到NSTreeController(节点在窗口大小调整时折叠)

Question

我可以通过Interface Builder成功地将NSTreeController绑定到NSOutlineView。当我尝试用编程方式做同样的事情时，我也可以让它工作，除了一个小问题。

调整轮廓视图所固定的窗口大小，将折叠所有打开的项目。如果我以其他方式调整大纲视图的大小，比如把它放在NSSplitView中，上下移动滑块不会造成任何问题。只有当我调整窗口大小时才会发生。

outline视图只是Interface Builder中的默认视图。我把它放在一个窗口，固定所有的四个边，连接出口到我的ViewController，就是这样。

有人有什么见解吗?谢谢。

我是这样用编程方式创建东西的:

override func viewWillLayout() {
    super.viewWillLayout()
    var treeController: NSTreeController!
    @IBOutlet weak var outlineView: NSOutlineView!
    var content = [TreeNode]()
    newTreeController = NSTreeController.init(content: nil)
    newTreeController.objectClass = TreeNode.self
    newTreeController.childrenKeyPath = "children"
    newTreeController.countKeyPath = "count"
    newTreeController.leafKeyPath = "leaf"
    newTreeController.preservesSelection = true
    newTreeController.isEditable = true
    newTreeController.bind("contentArray", to: self, withKeyPath: "content", options: nil)
    outlineView.delegate = self
    outlineView.bind("content", to: newTreeController, withKeyPath: "arrangedObjects", options: nil)
    outlineView.bind("selectionIndexPaths", to: newTreeController, withKeyPath: "selectionIndexPaths", options: nil)
}
override func viewDidLoad() {
    super.viewDidLoad()
    willChangeValue(forKey: "content")
    // POPULATE CONTENT ARRAY
    didChangeValue(forKey: "content")
}
// NSOutlineViewExtension
func outlineView(_ outlineView: NSOutlineView, viewFor tableColumn: NSTableColumn?, item: Any) -> NSView? {
    var cellView: NSTableCellView?
    if let identifier = tableColumn?.identifier {
        if let view = outlineView.make(withIdentifier: identifier, owner: outlineView.delegate) as? NSTableCellView {
            // view.imageView?.bind(NSValueBinding, to: view, withKeyPath: "objectValue.WHATEVER_PROPERTY", options: nil)
            // view.textField?.bind(NSValueBinding, to: view, withKeyPath: "objectValue.WHATEVER_PROPERTY", options: nil)
            cellView = view
        }
    }
    return cellView
}

Answer 1

viewWillLayout()是设置树形控制器和大纲视图的错误位置。它被反复调用，并不是用来做这类事情的。

将所有内容移动到viewDidLoad()中，问题就解决了