如何使用NSBrowser中所选单元格的路径更新NSPathControl

import Cocoa

class ViewController: NSViewController, NSBrowserDelegate {

    @IBOutlet weak var browser: NSBrowser!
    @IBOutlet weak var pathControl: NSPathControl!

    override func viewDidLoad() {
        super.viewDidLoad()
        browser.delegate = self
    }

    func browser(_ browser: NSBrowser, numberOfRowsInColumn column: Int) -> Int {
        // 返回每个列中的行数
    }

    func browser(_ browser: NSBrowser, objectValueForItem item: Any?, row: Int, column: Int) -> Any? {
        // 返回每个单元格的值
    }

    func browser(_ browser: NSBrowser, selectionIndexesForProposedSelection proposedSelectionIndexes: IndexSet, inColumn columnIndex: Int) -> IndexSet {
        // 当用户选择单元格时，更新NSPathControl
        let selectedRow = proposedSelectionIndexes.first
        let selectedColumn = columnIndex
        let selectedPath = getPath(row: selectedRow, column: selectedColumn)
        pathControl.url = URL(fileURLWithPath: selectedPath)
        return proposedSelectionIndexes
    }

    func getPath(row: Int?, column: Int?) -> String {
        // 根据所选单元格的行和列，返回对应的路径
    }
}