What methods and techniques do you know for improving performance when working with UICollectionView and UITableView?

To improve performance when working with UICollectionView and UITableView, you can use the following methods:

• Cell reuse: always use dequeueReusableCell to avoid creating new cells each time.
• Asynchronous data and image loading: load heavy resources in the background to prevent blocking the UI.
• Caching: cache images and data to avoid reloading them.
• Minimize work in delegate and datasource methods: avoid complex calculations in cellForRowAt and similar methods.
• Pre-calculate cell sizes: use estimatedRowHeight and automatic size calculation to avoid unnecessary recalculations.
• Use lightweight views and optimize cell hierarchy: reduce the number of nested views, use opaque backgrounds.

Example of cell reuse in Swift:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath)
    // Configure the cell
    return cell
}