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Read More / See Less UICollectionViewCell Issues with resizing - don't know where I am being a n00b >. <

DataSource:

extension AuthorDataSource: UICollectionViewDelegateFlowLayout {
  func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: content[indexPath.row].identifier, for: indexPath)
     
    switch content[indexPath.item] {
    case .authorImage:
      return CGSize(width: collectionView.frame.width, height: 275)
    case .expandable:
       let cell = cell as! ExpandableCollectionViewCell
       
      /// Fetch height of `cell. authDescLabel` here
       
      if cell.isExpanded {
        return CGSize(width: collectionView.frame.width, height: 500)
      } else {
        return CGSize(width: collectionView.frame.width, height: 200)
      }
    }
  }
}

extension AuthorDataSource: UICollectionViewDelegate {
  func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    guard let cell = collectionView.cellForItem(at: indexPath) as? ExpandableCollectionViewCell else { return }
    cell.configureWhenExpanded()
    /// collectionView.reloadItems(at: [indexPath]) here, `sizeForItemAt` would be called but reset isExpanded to false . . . 
  }
}

Function in custom cell:

class ExpandableCollectionViewCell: UICollectionViewCell {
  var isExpanded: Bool = false
   
  func configureWhenExpanded() {
      isExpanded = !isExpanded
       
      if isExpanded {
        authorDescLabel.numberOfLines = 0
        authorDescLabel.lineBreakMode = .byWordWrapping
        readMoreSeeLessAttrText = "See less"
      } else {
        authorDescLabel.numberOfLines = 6
        authorDescLabel.lineBreakMode = .byTruncatingTail
        readMoreSeeLessAttrText = "Read More"
      }
  }
}

RESOLVED

Set isExpanded in data source to avoid resetting of it during new instance

@lganti Glad you sorted it out! Cheers! :]

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