NSCollectionView single selection is not working, but multiple selection is fine - macos

Question

As title described,
my NSCollectionView is not working when single selection.
MyNSCollectionView is rendered correcttly,
below code shows how I initialize my NSCollectionView:
self.leftBar.dataSource = self
self.leftBar.delegate = self
self.leftBar.isSelectable = true
self.leftBar.allowsEmptySelection = true
let layout = NSCollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.itemSize = NSSize(width: 200 , height: 50)
leftBar.collectionViewLayout = layout
self.contentView.addSubview(leftBar)
leftBar <- [
Top(),
Left(),
Bottom(),
Width(200)
]
Custom NSCollectionViewItem
class LeftBarCell: NSCollectionViewItem {
var leftBarView : LeftBarView?
override func loadView() {
leftBarView = LeftBarView(frame: NSZeroRect)
view = leftBarView!
}
func setup(title : String){
leftBarView?.titleTextView.string = title
}
}
In LeftBarView
class LeftBarView: NSView {
lazy var titleTextView : NSTextView = {
let titleTextView = NSTextView()
titleTextView.isEditable = false
titleTextView.isSelectable = false
titleTextView.font = NSFont(name: "Helvetica", size: 20)
return titleTextView
}()
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
self.setupViews()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
}
func setupViews(){
self.addSubview(titleTextView)
self.wantsLayer = true
self.layer?.backgroundColor = NSColor.lightGray.cgColor
titleTextView <- Edges()
}
}
I tried to play around with
self.leftBar.isSelectable = true
leftBar.allowsMultipleSelection = true
and multiple selection is working.
The didSelectItemsAt from NSCollectionViewDelegate is triggered
But then when I try with this
self.leftBar.isSelectable = true
or
self.leftBar.isSelectable = true
self.leftBar.allowsEmptySelection = true
It is not working when I click on the collectionviewitem,
The didSelectItemsAt from NSCollectionViewDelegate is not triggered.
Any thoughts would be appreciated, thanks!

Answer 1

Solved. This is because the textview covers the cell, u might need to disable the textview to become passive.
extension NSTextView {
open override func hitTest(_ point: NSPoint) -> NSView? {
return nil
}
}