NSCollectionViewItem 没有选择 swift

如何解决NSCollectionViewItem 没有选择 swift

美好的一天，

我有一个 NSCollectionView，它是可选的并且工作正常。我创建了另一个 NSCollectionView，下面的自定义 NSCollectionViewItem 是 NSCollectionViewItem 的代码

class DocumentItem: NSCollectionViewItem {

   var itemView: DocumentTextView?
   
   override func viewDidLoad() {
       super.viewDidLoad()
       self.itemView?.wantsLayer = true
       
   
       // Do view setup here.
   }

   override func loadView() {
       self.itemView = DocumentTextView(frame: NSZeroRect)
       self.view = self.itemView!
       
   }

   func getView() -> DocumentTextView {
       return self.itemView!
   }
  

   override var isSelected: Bool {
       didSet {
           self.itemView?.layer?.backgroundColor = isSelected ? NSColor.darkGray.cgColor : NSColor.clear.cgColor
           
           
           
       }
     }

}

以下是 DocumentTextView 的代码

class DocumentTextView: NSTextView {
    
    
    var theContainer = NSTextContainer()
    var theStorage = NSTextStorage()
    var theManager = NSLayoutManager()
        
    
    override init(frame frameRect: NSRect) {
        super.init(frame: NSRect(origin: frameRect.origin,size: NSSize(width: 765,height: 1081.84414 )),textContainer: theContainer)
        theContainer.containerSize = NSSize(width: 765,height: 1081.84414)
        theStorage.addLayoutManager(theManager)
        theManager.addTextContainer(theContainer)
        self.textContainerInset = CGSize(width: 50,height: 50)
        self.textContainer?.widthTracksTextView = false
        self.textContainer?.heighttracksTextView = false
        self.textContainer?.lineBreakMode = .byClipping
        self.maxSize = NSSize(width: 765,height: 1081.84414)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
        
    func image() -> NSImageView {
        let imageRepresentation = bitmapImageRepForCachingdisplay(in: bounds)!
        cachedisplay(in: bounds,to: imageRepresentation)
        let theImage = NSImage(cgImage: imageRepresentation.cgImage!,size: CGSize(width: 170,height: 240))
        return NSImageView(image: theImage)
        }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
    }
    

}

我已经将 NSCollectionView 设置为可以在界面构建器中选择，但由于某种原因它不可选择。覆盖的 isSelectable 变量没有触发，我无法访问任何选择索引。非常感谢任何帮助