UITableView (lists) and UICollectionView (grids) display scrollable data efficiently by reusing cells.
A simple table
class ListVC: UITableViewController {
let items = ["One", "Two", "Three"]
override func tableView(_ t: UITableView, numberOfRowsInSection s: Int) -> Int {
items.count
}
override func tableView(_ t: UITableView, cellForRowAt ip: IndexPath) -> UITableViewCell {
let cell = t.dequeueReusableCell(withIdentifier: "cell", for: ip)
cell.textLabel?.text = items[ip.row]
return cell
}
}Tip: Modern apps use diffable data sources for automatic, animated updates when the data changes.
Summary
Table and collection views render large lists/grids efficiently via cell reuse and a data source.