ios - TableView 单元格内的 Collection View

Question

我想在 TableView 单元格内创建 Collection View 以水平滚动元素。但是我遇到了如何正确填写我的收藏 View 的问题。我需要一种方法将 Collection View 与我的数据连接起来。

我如何获取并遍历 TableView 单元格以找到所需的 Collection View 并返回包含数据的单元格？

Answer 1

下面是一个通用示例，说明如何将数据传递到 TableView 单元格内的 Collection View 。还有这个link是有关此主题的 youtube 教程。

模型:

class ListOfParents: NSObject {
var parents:[Parent]?
}

class Parent: NSObject {
var children: [Child]?

static func fetchParents(_ completionHandler: @escaping (ListOfParents) -> ()) {
    //fetch parents data
 }

}

class Child: NSObject {

}

TableView 单元格:

class CustomTableViewController: UITableViewController {

var listOfParents: ListOfParents?

override func viewDidLoad() {
    super.viewDidLoad()
    Parent.fetchparents { (listOfParents) in
        self.listOfParents = listOfParents
    }
    tableView.register(CustomParentCell.self, forCellReuseIdentifier: "tableCell")

}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    guard let parentsCount = listOfParents?.parents?.count else {return 0}
    return parentsCount
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "tableCell", for: indexPath) as! CustomParentCell

    cell.parent = listOfParents?.parents?[indexPath.item]
    return cell
 }
}

父单元格:

class CustomParentCell: UITableViewCell, UICollectionViewDelegate, UICollectionViewDataSource {


var parent: Parent? {
    didSet {
        // set child value here
    }
}

lazy var collectionView: UICollectionView = {
    let layout = UICollectionViewFlowLayout()
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
    return collectionView
}()

override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    collectionView.delegate = self
    collectionView.dataSource = self
    collectionView.register(CustomChildCell.self, forCellWithReuseIdentifier: "childCellID")
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    guard let childrenCount = parent?.children?.count else {return 0}
    return childrenCount
}

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

    cell.child = parent?.children?[indexPath.item]
    return cell
 }
}

子单元格:

class CustomChildCell: UICollectionViewCell {
var child: Child?
}