UITableView inside a UICollectionView: can't set value - ios

Question

I have a UICollectionView with 4 UICollectionViewCells. Each cell contains a UITableView with a varying number of cells.
I have an array from which I need to pass a value (depending on the indexPath) into the cell. My problem is that it always gives me nil when I try to do this.
So for example I have this array:
let arrayOfStrings = ["test1", "test2", "test3", "test4"]
I have this code in my collection view's cellForItemAt method:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "testCollectionViewCell", for: indexPath) as! TestCollectionViewCell
cell.myString = arrayOfStrings[indexPath.row]
cell.label.text = "This text is set."
return cell
}
The cell's label is set properly, but when I try to print myString in the cell's table view's cellForRowAt method it always returns nil.
I need the string because I plan to manipulate the table views depending on the string passed in.
So why is this happening and what can be done?

Answer 1

You can try like this
extension HomeViewController : UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 4
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "DealTableViewCell", for: indexPath) as! DealTableViewCell
cell.DealCollectionView.dataSource = self
cell.DealCollectionView.delegate = self
cell.DealCollectionView.tag = 10101
return cell
} else if indexPath.row == 1 {
let cell = tableView.dequeueReusableCell(withIdentifier: "BusinessTableViewCell", for: indexPath) as! BusinessTableViewCell
cell.BusinessCollectionView.dataSource = self
cell.BusinessCollectionView.delegate = self
cell.BusinessCollectionView.tag = 10102
return cell
} else if indexPath.row == 2 {
let cell = tableView.dequeueReusableCell(withIdentifier: "FilterTableViewCell", for: indexPath) as! FilterTableViewCell
cell.FilterCollectionView.dataSource = self
cell.FilterCollectionView.delegate = self
cell.FilterCollectionView.tag = 10103
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: "ComboTableViewCell", for: indexPath) as! ComboTableViewCell
cell.ComboCollectionView.dataSource = self
cell.ComboCollectionView.delegate = self
cell.ComboCollectionView.tag = 10104
return cell
}
}
}
Add the collection view to each tableview cell and set delegate in tableview cell
extension HomeViewController : UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView.tag == 10101 {
return 3
} else if collectionView.tag == 10102 {
return 3
} else if collectionView.tag == 10103 {
return 3
} else if collectionView.tag == 10104 {
return 3
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView.tag == 10101 {
let cell = collectionView.dequeueReusableCell(withIdentifier: "DealCollectionViewCell", for: indexPath) as! DealCollectionViewCell
return cell
} else if collectionView.tag == 10102 {
let cell = collectionView.dequeueReusableCell(withIdentifier: "BusinessCollectionViewCell", for: indexPath) as! BusinessCollectionViewCell
return cell
} else if collectionView.tag == 10103 {
let cell = collectionView.dequeueReusableCell(withIdentifier: "FilterCollectionViewCell", for: indexPath) as! FilterCollectionViewCell
return cell
} else if collectionView.tag == 10104 {
let cell = collectionView.dequeueReusableCell(withIdentifier: "ComboCollectionViewCell", for: indexPath) as! ComboCollectionViewCell
return cell
}
return UICollectionViewCell()
}
}
For reload the collectionView in use
if let cell = self.tableView.cellForRow(at: IndexPath(row: i, section: 0)) as?
tableViewCell {
cell.collectionView.reloadData()
}