Rounded corners of NSCollectionViewItem

Question

Simple question, but I can't find any answers... How I can change corner radius of NSCollectionViewItem instance?

@GeneCode here I need to set its property? In `viewDidLayout` of item? Of delegate method in controller that has `NSCollectionView` as subview? — Artem Novichkov, Jan 16 '17 at 09:22
Should be in the collectionview subclass. (alternatively in the delegate) — GeneCode, Jan 16 '17 at 09:28
@GeneCode I dont want to subclass `NSCollectionView`, in which delegate method I need to change corner radius? — Artem Novichkov, Jan 16 '17 at 09:29
If you set the item bg color, then you need to set [item.layer setMaskToBounds:YES]; — GeneCode, Jan 16 '17 at 09:52

score 1 · Accepted Answer · answered Jan 16 '17 at 09:59

view of NSCollectionViewItem doesn't have layer by default. You need to set wantsLayer to true, for example:

import Cocoa

class TestCellItem: NSCollectionViewItem {

    override func viewDidLoad() {
        super.viewDidLoad()
        view.wantsLayer = true
        view.layer?.backgroundColor = NSColor.red.cgColor
    }

    override func viewDidLayout() {
        super.viewDidLayout()
        view.layer?.cornerRadius = 20
    }
}

Rounded corners of NSCollectionViewItem

1 Answers1