Swift CollectionViewCell Auto Height - ios

Question

I try to make my cell to auto resize with the content of a label.
My Cell contains two labels. The first label is always one line, the other can be multiline.
The problem is that the cell won't resize. This is my code :
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
CollectionViewHeight.constant = CGFloat(60 + 60 * commentaires.count)
return commentaires.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = commentCollectionView.dequeueReusableCell(withReuseIdentifier: "customCell", for: indexPath) as! CustomCollectionViewCell
cell.contentCommentLabel.text = commentaires[indexPath.row]
cell.nameCommentLabel.text = commentairesNom[indexPath.row]
cell.contentView.systemLayoutSizeFitting(UILayoutFittingCompressedSize)
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
// This is Just for example , for the scenario Step-I -> 1
let yourWidthOfLable = self.view.bounds.size.width
let font = UIFont(name: "System", size: 14.0)
var expectedHeight = heightForLable(text: commentaires[indexPath.row], font: font!, width:yourWidthOfLable )
print("expectedHeight : " + String(describing: expectedHeight))
return CGSize(width: view.frame.width, height: expectedHeight)
}
func heightForLable(text:String, font:UIFont, width:CGFloat) -> CGFloat{
let label:UILabel = UILabel(frame: CGRect(x: 0, y: 0, width: width, height: CGFloat.greatestFiniteMagnitude))
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.byWordWrapping
label.font = font
label.text = text
label.sizeToFit()
return label.frame.height
}

Answer 1

You need to get height of UILabel programmatically according to font family, font size and width of UILabel and than after add this height in top UILabel's height. This is your total height of cell.

Answer 2

Usually i use this code to configure my CollectionView:
private func config_collection()
{
self.collection_view.delegate = self
self.collection_view.dataSource = self
self.collection_view.keyboardDismissMode = .interactive
self.collection_view.alwaysBounceVertical = true
self.collection_view.showsVerticalScrollIndicator = true
self.collection_view.showsHorizontalScrollIndicator = false
if let layout = self.collection_view.collectionViewLayout as? UICollectionViewFlowLayout
{
layout.scrollDirection = .vertical
layout.minimumLineSpacing = 2
}
}
extension ViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout
{
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.frame.width, height: 50)
}
}
Edit 1:
To resize the cell by estimate height i use this code:
func get_size_height_text(texto: String,
ui_view: UIView) -> CGFloat
{
let l : [NSAttributedStringKey : Any] = [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 17)]
let size = CGSize(width: ui_view.frame.width,
height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let estimateFrame = NSString(string: texto).boundingRect(with: size,
options: options,
attributes: l,
context: nil)
return estimateFrame.height
}
To use it, run this code:
let height = get_size_height_text(texto: label.text ?? "",
ui_view: self.view)
with this height, you need to increment the value with your preference to use it in your cell