Issue #131
Here’s how to create NSCollectionView programatically. We need to embed it inside NScrollView for scrolling to work. Code is in Swift 4
NSCollectionView
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| let layout = NSCollectionViewFlowLayout()
layout.minimumLineSpacing = 4
collectionView = NSCollectionView()
collectionView.dataSource = self
collectionView.delegate = self
collectionView.collectionViewLayout = layout
collectionView.allowsMultipleSelection = false
collectionView.backgroundColors = [.clear]
collectionView.isSelectable = true
collectionView.register(
Cell.self,
forItemWithIdentifier: NSUserInterfaceItemIdentifier(rawValue: "Cell")
)
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| scrollView = NSScrollView()
scrollView.documentView = collectionView
view.addSubview(scrollView)
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NSCollectionViewItem
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| final class Cell: NSCollectionViewItem {
let label = Label()
let myImageView = NSImageView()
override func loadView() {
self.view = NSView()
self.view.wantsLayer = true
}
}
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NSCollectionViewDataSource
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| func collectionView(_ collectionView: NSCollectionView, numberOfItemsInSection section: Int) -> Int {
return coins.count
}
func collectionView(_ collectionView: NSCollectionView, itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
let cell = collectionView.makeItem(
withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "Cell"),
for: indexPath
) as! Cell
let coin = coins[indexPath.item]
cell.label.stringValue = coin.name
cell.coinImageView.image =
NSImage(named: NSImage.Name(rawValue: "USD"))
?? NSImage(named: NSImage.Name(rawValue: "Others"))
return cell
}
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NSCollectionViewDelegateFlowLayout
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| func collectionView(_ collectionView: NSCollectionView, didSelectItemsAt indexPaths: Set<IndexPath>) {
guard let indexPath = indexPaths.first,
let cell = collectionView.item(at: indexPath) as? Cell else {
return
}
}
func collectionView(_ collectionView: NSCollectionView, didDeselectItemsAt indexPaths: Set<IndexPath>) {
guard let indexPath = indexPaths.first,
let cell = collectionView.item(at: indexPath) as? Cell else {
return
}
}
func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> NSSize {
return NSSize(
width: collectionView.frame.size.width,
height: 40
)
}
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Updated at 2020-05-22 11:48:15