Transparent NSCollectionView Background

Question

I\'m again struggling with setting NSViews background colors to transparent. I have a NSCollectionView as part of NSClipView which is part of a

Answer 1

To make clear background for NSScrollView, the best option in Swift 4.2 is "Not draw a background". Let's get to view a programmatically example:

let scrollView = NSScrollView()
scrollView.drawsBackground = false
scrollView.contentView.drawsBackground = false

NSCollectionView has background for sections, so you need to specify colors for sections

let collectionView = NSCollectionView()
collectionView.backgroundColors = [.clear]

If you set backgroundColors to nil or to empty array, the background color is set by default to white.

If you set a background view for NSCollectionView, this array is ignored

You could try to put a NSView with frame zero as a backgroundView for NSCollectionView