Post not yet marked as solved
I built a small swift utility library, playing around with some new features introduced this year, one of them being DocC. I was able to successfully build the documentation https://timekeeper.aplr.io, which works great for all classes and structs, but I can't get DocC to include docs for the public Combine Publisher extension (here). Is there some way to do this or is it just not supported (yet, hopefully).
Thanks,
Andreas
Post not yet marked as solved
I have two UICollectionViews, UICV1 which has UICV2 nested within one of its cells. What I want is that UICV2 self-sizes according to its content, but both the contentSize and collectionViewLayout.collectionViewContentSize is zero.
This exact same setup worked before, the only difference is that UICV2 was a UITableView. Due to code refactoring and reuse, I switched to using UICollectionView. The new view hierarchy looks something like that:
+--------------------+
| UICV1 |
| +----------------+ |
| | Cell | |
| | +------------+ | |
| | | Stack View | | |
| | | +--------+ | | |
| | | | UICV2 | | | |
| | | +--------+ | | |
| | +------------+ | |
| +----------------+ |
| ... |
+--------------------+
Both collection views are configured with a UICollectionViewCompositionalLayout:
// UICV1
let layout1 = UICollectionViewCompositionalLayout { sectionIndex, layoutEnvironment in
let itemSize = NSCollectionLayoutSize(
widthDimension: .fractionalWidth(1.0),
heightDimension: .estimated(100)
)
let item = NSCollectionLayoutItem(layoutSize: itemSize)
let group = NSCollectionLayoutGroup.horizontal(
layoutSize: itemSize,
subitem: item,
count: 1
)
return NSCollectionLayoutSection(group: group)
}
// UICV2
let layout2 = UICollectionViewCompositionalLayout.list(using: {
var configuration = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
configuration.headerMode = .none
configuration.headerTopPadding = 0
return configuration
}())
let collectionView = SelfSizingCollectionView(
frame: .zero,
collectionViewLayout: layout2
)
This is the code for the self sizing collection view:
class SelfSizingCollectionView: UICollectionView {
override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
super.init(frame: frame, collectionViewLayout: layout)
isScrollEnabled = false
contentInsetAdjustmentBehavior = .never
}
override var contentSize: CGSize {
didSet {
invalidateIntrinsicContentSize()
}
}
override func layoutSubviews() {
super.layoutSubviews()
invalidateIntrinsicContentSize()
}
override var intrinsicContentSize: CGSize {
layoutIfNeeded()
// This is always (0.0, 0.0)
return CGSize(
width: UIView.noIntrinsicMetric,
height: collectionViewLayout.collectionViewContentSize.height
)
}
}
I am using a NSDiffableDataSourceSnapshot for providing data to both collection views, if this makes any difference.
I hope someone could help me here, I'm totally lost after playing with combinations of invalidateLayout(), setNeedsLayout() and layoutIfNeeded() at various points within SelfSizingCollectionView.
I found a ton of answers regarding self-sizing collection views, which I incorporated into my code, but they don't seem to work for the quite new UICollectionViewCompositionalLayout.
