UICollectionView inside of UICollectionView with dynamic height - ios

Question

I am trying to create a similar layout to the App store. I have got one collection view that is vertical and inside of it each row is another collection view that is horizontal.
I am trying to use dynamic height so the cell can increase its height based on the content inside. However that never works, it only works when i use sizeForItemAt function to explicitly set it. I would like to also be able to control the width
I have looked at many previous questions such as: UICollectionView, full width cells, allow autolayout dynamic height? however no answer worked for me.
I am really confused on what i am doing wrong.
import UIKit
class HomeViewController: UICollectionViewController {
public override func viewDidLoad() {
super.viewDidLoad()
let collectionViewLayout = UICollectionViewFlowLayout()
collectionViewLayout.scrollDirection = .vertical
collectionViewLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
collectionView.collectionViewLayout = collectionViewLayout
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView?.register(HorizontalCollectionView.self, forCellWithReuseIdentifier: HorizontalCollectionView.reuseIdentifier)
}
public override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1
}
public override func numberOfSections(in collectionView: UICollectionView) -> Int {
return 4
}
public override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: HorizontalCollectionView.reuseIdentifier, for: indexPath) as? HorizontalCollectionView {
return cell
}
return UICollectionViewCell()
}
}
HorizontalCollectionView.swift
import UIKit
class HorizontalCollectionView: UICollectionViewCell, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
static let reuseIdentifier = "HorizontalCollectionView"
var cellSpancolumns: CGFloat?
override init(frame: CGRect) {
super.init(frame: frame)
collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "cell")
collectionView.delegate = self
collectionView.dataSource = self
addSubview(collectionView)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented - Storyboards are not used.")
}
lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
let collectionView = UICollectionView(frame: bounds, collectionViewLayout: layout)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.showsHorizontalScrollIndicator = false
return collectionView
}()
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
if (indexPath as NSIndexPath).section == 0 {
cell.backgroundColor = UIColor.blue
} else {
cell.backgroundColor = UIColor.red
}
return cell
}
}