tableview图像颜色随短暂延迟而变化

Question

此问题是此主题的补充：tableview image content selection color

一切正常，但有一件事困扰我。 这是结果：

您可以看到图像的默认颜色为灰色。 如果选择一行，图像应该将颜色更改为白色 - 它有效！但你可以看到它会改变颜色之前的短暂延迟（我希望你看到我的意思）

我可以优化吗？

这是我的代码：

// Change Color of Image
    func tintedImage(_ image: NSImage, tint: NSColor) -> NSImage {
        guard let tinted = image.copy() as? NSImage else { return image }
        tinted.lockFocus()
        tint.set()

        let imageRect = NSRect(origin: NSZeroPoint, size: image.size)
        imageRect.fill(using: .sourceAtop)

        tinted.unlockFocus()
        return tinted
    }


func outlineViewSelectionIsChanging(_ notification: Notification) {

   if lastSelectedRow != nil {
      let view = myOutlineView.view(atColumn: 0, row: lastSelectedRow!, makeIfNecessary: true) as! CustomCell
                    view.imgView.image = self.tintedImage(NSImage(named: NSImage.Name(rawValue: "MyImage"))!, tint: NSColor.grey)
                }

                lastSelectedRow = myOutlineView.selectedRow

    }

 func outlineView(_ outlineView: NSOutlineView, viewFor tableColumn: NSTableColumn?, item: Any) -> NSView? {


            let view = outlineView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "Cell"), owner: self) as? CustomCell

            if lastSelectedRow == outlineView.selectedRow {
                view?.imgView.image = self.tintedImage(NSImage(named: NSImage.Name(rawValue: "MyImage"))!, tint: NSColor.white)
            } else {
                view?.imgView.image = self.tintedImage(NSImage(named: NSImage.Name(rawValue: "MyImage"))!, tint: NSColor.grey)
            }



            return view
}