How to change NSPopover background color include triangle part?

Question

How can I change NSPopover background color include triangle part?

Answer 1

Swift 3

override func viewDidMoveToWindow() {

    guard let frameView = window?.contentView?.superview else {
        return
    }

    let backgroundView = NSView(frame: frameView.bounds)
    backgroundView.wantsLayer = true
    backgroundView.layer?.backgroundColor = .white // colour of your choice
    backgroundView.autoresizingMask = [.viewWidthSizable, .viewHeightSizable]

    frameView.addSubview(backgroundView, positioned: .below, relativeTo: frameView)

}

If you want to change only the background colour of the popover (including the triangle/arrow), I figured that you don't need to create a subclass of NSView. A layer-backed NSView with a background colour should suffice.

Also, you don't need to call super.viewDidMoveToWindow() because its default implementation does nothing.