[docs] UIKit.md: Collections & Tables section

This commit is contained in:
Daniel Arantes Loverde
2026-08-29 19:33:59 -03:00
parent ac9d010b8e
commit 6eb57f5c44

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@@ -606,7 +606,97 @@ UIDevice.current.modelName // "iPhone 16 Pro"
## Collections & Tables ## Collections & Tables
<!-- batch 12 --> <details>
<summary><b>UITableView</b> — typed dequeue, safe indexing, cell animations</summary>
### `func dequeueReusableCell<T: UITableViewCell>(withClass name: T.Type) -> T` / `…(withClass:for indexPath:) -> T`
Dequeue a cell by its class name as the identifier. **Traps** if the cell isn't registered.
```swift
let cell = tableView.dequeueReusableCell(withClass: OrderCell.self, for: indexPath)
```
### `func dequeueReusableHeaderFooterView<T: UITableViewHeaderFooterView>(withClass name: T.Type) -> T`
Same, for section header/footer views.
### `func dequeueCell<T: UITableViewCell>(indexPath: IndexPath) -> T`
Dequeue using `T.identifier` (`"id" + class name`).
### `func reloadData(_ completion: @escaping () -> Void)`
`reloadData()` with a callback for when layout settles.
### `func isValidIndexPath(_:) -> Bool`
Bounds check against the current section/row counts.
### `func safeScrollToRow(at:at scrollPosition:animated:)`
`scrollToRow` that silently no-ops for an out-of-range index path.
### `func makeMoveUpWithFadeAnimation(rowHeight:duration:delayFactor:) -> UITableViewCellAnimation`
Build a staggered slide-up + fade-in cell animation closure.
```swift
let animator = UITableViewAnimator(
animation: tableView.makeMoveUpWithFadeAnimation(rowHeight: 64, duration: 0.35, delayFactor: 0.03)
)
func tableView(_ t: UITableView, willDisplay cell: UITableViewCell, forRowAt ip: IndexPath) {
animator.animate(cell: cell, at: ip, in: t)
}
```
### `typealias UITableViewCellAnimation = (UITableViewCell, IndexPath, UITableView) -> Void`
### `class UITableViewAnimator`
`init(animation:)` + `animate(cell:at:in:)` — runs a cell animation closure.
### `UITableViewCell.identifier` / `UITableViewCell.prepareDisclosureIndicator()`
`"id" + class name`; and re-tint the disclosure chevron to a template image so it
picks up `tintColor`.
</details>
<details>
<summary><b>UICollectionView</b> — setup, counts, safe indexing, carousel layout</summary>
### `static var identifier: String`
`"id" + class name`.
### `func setupCollectionView(flowLayout: = UICollectionViewFlowLayout(), spacings: = 0, direction: = .horizontal, edgesInset: = .zero, allowMulpleSelection: Bool = false, automaticSize: CGSize? = nil)`
Configure layout spacing/direction/insets, multi-selection, and self-sizing in one call.
```swift
collectionView.setupCollectionView(spacings: 8, direction: .vertical,
edgesInset: .init(top: 12, left: 16, bottom: 12, right: 16))
```
### `func reloadData(_ completion: @escaping () -> Void)`
Reload with a completion callback.
### `func numberOfItems() -> Int`
Total items across all sections.
### `var lastSection: Int` / `var indexPathForLastItem: IndexPath?` / `func indexPathForLastItem(inSection:) -> IndexPath?`
Last section index; index path of the last item overall or in a section.
### `func isValidIndexPath(_:) -> Bool` / `func safeScrollToItem(at:at scrollPosition:animated:)`
Bounds check; scroll that no-ops on an invalid index path.
### `enum CollectionViewFlowLayoutSpacingMode`
`.fixed(spacing:)` / `.overlap(visibleOffset:)` — spacing strategy for the carousel layout below.
### `open class CollectionViewFlowLayout: UICollectionViewFlowLayout`
A centred, paginated "cover-flow" style layout: the centred item is full size,
side items scale and fade. Tunables: `sideItemScale` (0.6), `sideItemAlpha`
(0.6), `sideItemShift` (0), `spacingMode` (`.fixed(40)`).
```swift
let layout = CollectionViewFlowLayout()
layout.itemSize = CGSize(width: 240, height: 320)
layout.sideItemScale = 0.7
layout.spacingMode = .overlap(visibleOffset: 30)
collectionView.collectionViewLayout = layout
```
</details>
## Media & Components ## Media & Components