Вложенные представления коллекций с динамическим содержимым ⇐ IOS

[Anonymous]

Я использую два вложенных представления коллекций. Я добавил ChildCollectionView в ParentCollectionViewCell, и ChildCollectionView содержит 3 ячейки, но ParentCollectionViewCell не корректирует рамку ячейки в соответствии с содержимым.
Вот код,
ParentCollectionView

Код: Выделить всё

class ViewController: UIViewController {

var parentCollectionView: UICollectionView = {
let _collectionView = UICollectionView.init(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout.init())
return _collectionView
}()

let id = "ParentCollectionViewCell"

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.

view.addSubview(parentCollectionView)

parentCollectionView.translatesAutoresizingMaskIntoConstraints = false

NSLayoutConstraint.activate([
parentCollectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
parentCollectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
parentCollectionView.topAnchor.constraint(equalTo: view.topAnchor),
parentCollectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])

parentCollectionView.dataSource = self

parentCollectionView.register(UINib(nibName: id, bundle: nil), forCellWithReuseIdentifier: id)

if let flowLayout = parentCollectionView.collectionViewLayout as? UICollectionViewFlowLayout {
flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
}
}

}

extension ViewController: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
1
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: id, for: indexPath) as! ParentCollectionViewCell

cell.backgroundColor = .red

return cell

}

}

ParentCollectionViewCell

Код: Выделить всё

class ParentCollectionViewCell: UICollectionViewCell {

var childCollectionView: UICollectionView = {
let _collectionView = UICollectionView.init(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout.init())
return _collectionView
}()

let reuseId = "ChildCollectionViewCell"

private let data = ["ChildCell1","ChildCell2","ChildCell3"]

override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
setupViews()
}

func setupViews() {
contentView.addSubview(childCollectionView)

childCollectionView.translatesAutoresizingMaskIntoConstraints = false

NSLayoutConstraint.activate([
childCollectionView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
childCollectionView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
childCollectionView.topAnchor.constraint(equalTo: contentView.topAnchor),
childCollectionView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
childCollectionView.widthAnchor.constraint(equalToConstant: 360)
])

childCollectionView.dataSource = self

childCollectionView.register(UINib(nibName: reuseId, bundle: nil), forCellWithReuseIdentifier: reuseId)

if let flowLayout = childCollectionView.collectionViewLayout as? UICollectionViewFlowLayout {
flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
}
}
}

extension ParentCollectionViewCell: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
data.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) ->  UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseId, for: indexPath) as! ChildCollectionViewCell

cell.backgroundColor = .gray

cell.setupViews()

return cell
}
}

ChildCollectionViewCell

Код: Выделить всё

class ChildCollectionViewCell: UICollectionViewCell {

override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}

func setupViews() {

let label = UILabel()

label.text = "Child Collection"

label.numberOfLines = 0

label.font = label.font.withSize(50)

contentView.addSubview(label)

label.translatesAutoresizingMaskIntoConstraints = false

NSLayoutConstraint.activate([
label.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
label.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
label.topAnchor.constraint(equalTo: contentView.topAnchor),
label.bottomAnchor.constraint(equalTo: contentView.bottomAnchor)
])

}

}

Текущий результат
Текущий результат
Ожидаемый результат
Ожидаемый результат

Подробнее здесь: https://stackoverflow.com/questions/736 ... ic-content