Collection view inside table view - swift

Question

I have the following problem.
In my project I have a table view with multiple sections and one row in every section. Inside row I have a collection view.
Collection view items count depending on section in which the collection is located.But I do not understand how to access section number when I call func numberOfItemsInSection for collection view.
Here is my code:
ViewController.swift
func numberOfSections(in tableView: UITableView) -> Int {
return data.count
}
TableCell.swift
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
//TODO ?????? How can i get here section of table view
}
Thanks!

Answer 1

Create an array in UITableViewCell subclass and use that array in collectionview datasource methods
class CustomCell: UITableViewCell, UICollectionViewDelegate, UICollectionViewDataSource {
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
var collectionData = [String]()
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return collectionData.count
}
}
In tableView cellForRowAt method assign value to the array and reload colletion view
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell") as? CustomCell
cell?.collectionData = []//assign data here based on indexPath.section
cell?.collectionView.reloadData()
return cell!
}

Answer 2

Here you can use object oriented approach, in Your tableview cell create a variable tableSectionNumber. Like
class YourCell: UITableViewCell {
public var tableViewSectionNumber: Int = 0;
....
Now here in collectionView numberOfItemsInSection method, you can access it
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
//TODO ?????? How can i get here section of table view
self.tableViewSectionNumber // its here
}
Now you can set this value in the cell in your ViewController, when you are populating the cell in TableView cellForRowItem method, Like
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! YourCell
cell.tableViewSectionNumber = indexPath.section // here you set the section number in cell
}