change tableview cell content on collection view cell selection - swift

Question

I have a tableView and collectionView in one view controller.
in tableView I have title description and in collectionView I have lable .
I want on collectionView label selection tableView content should change .
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return Bookmark.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionViewBookmark.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! BookMarkCollectionViewCell
cell.lblTitle.text = Bookmark[indexPath.row]
cell.backgroundColor = UIColor.white
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionViewBookmark.cellForItem(at: indexPath)
cell?.backgroundColor = UIColor.blue
self.selectedIndexPath = indexPath
//
let newsDict = arrNewsData[indexPath.row]
if (indexPath.row == 1)
{
let cell1 = tableViewBookMark.cellForRow(at: indexPath) as! BookMarkFirstTableViewCell
cell1.lblTitle.text = newsDict["title"] as! String
tableViewBookMark.reloadData()
}
tableViewBookMark.reloadData()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableViewBookMark.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! BookMarkFirstTableViewCell
let dict = arrNewsData[indexPath.row]
cell.lblTitle.text = dict["title"] as! String
// cell.imgBookMark.image = dict["image_url"]
let url = URL(string: dict["image_url"] as! String)
URLSession.shared.dataTask(with: url!) { (data, response, error) in
if data != nil{
DispatchQueue.main.async {
let image = UIImage(data: data!)
cell.imgBookMark.image = image
}
}
}.resume()
return cell
}

Answer 1

See my inline comments.
var tempCell: BookMarkFirstTableViewCell?
//Inside cellForRowAt indexPath
tempCell = cell
//Inside (collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
tempCell.lblTitle.text = newsDict["title"] as! String

Answer 2

You're reloading the tableView after updating the values in the cell,
tableViewBookMark.reloadData()
This will trigger the data source function including cellForRowAt, so you will lose your updated values a solution to this is to have a global variable in the UIViewController and check its values inside the cellForRowAt and update it in the collectionView DidSelect .
Extra tip: you don't need to reload all the tableView for a single change you can use
tableView.reloadRows(at: [indexPath], with: .top)
to reload only number of selected cells in the tableView