在NSTableVIew中作为复选框的NSButtonCell不会被选中

import Cocoa

class CheckboxButtonCell: NSButtonCell {
    override func drawInterior(withFrame cellFrame: NSRect, in controlView: NSView) {
        let buttonRect = NSRect(x: cellFrame.origin.x + 2, y: cellFrame.origin.y + 2, width: cellFrame.size.width - 4, height: cellFrame.size.height - 4)
        let buttonPath = NSBezierPath(rect: buttonRect)
        
        NSColor.white.setFill()
        buttonPath.fill()
        
        NSColor.black.setStroke()
        buttonPath.lineWidth = 1
        buttonPath.stroke()
        
        if self.state == .on {
            let checkmarkPath = NSBezierPath()
            checkmarkPath.move(to: NSPoint(x: buttonRect.origin.x + 4, y: buttonRect.origin.y + buttonRect.size.height / 2))
            checkmarkPath.line(to: NSPoint(x: buttonRect.origin.x + buttonRect.size.width / 2 - 2, y: buttonRect.origin.y + 4))
            checkmarkPath.line(to: NSPoint(x: buttonRect.origin.x + buttonRect.size.width - 4, y: buttonRect.origin.y + buttonRect.size.height - 4))
            
            NSColor.black.setStroke()
            checkmarkPath.lineWidth = 2
            checkmarkPath.stroke()
        }
    }
    
    override func trackMouse(with event: NSEvent, in cellFrame: NSRect, of controlView: NSView, untilMouseUp flag: Bool) -> Bool {
        if self.isEnabled {
            self.state = (self.state == .on) ? .off : .on
            controlView.needsDisplay = true
        }
        return true
    }
    
    override func cellSize(forBounds rect: NSRect) -> NSSize {
        return NSSize(width: 20, height: 20)
    }
}

let checkboxColumn = NSTableColumn(identifier: NSUserInterfaceItemIdentifier("CheckboxColumn"))
checkboxColumn.headerCell.title = "Checkbox"
checkboxColumn.dataCell = CheckboxButtonCell()
tableView.addTableColumn(checkboxColumn)