ios - 为什么两个 TableView 单元格中的两个 Collection View 在 Swift 4 中不起作用？

Question

我阅读了类似的问题，例如如何在多个 TableView 单元格中拥有多个 Collection View ，并且我连接了我的 Collection View 单元格并为它们使用了标识符名称，但我不知道为什么会收到此错误:

* Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier extera_infoCollectionViewCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard' * First throw call stack:

** 请记住，我读过类似的问题，第一个带有 Collection View 的 TableView 单元格运行良好，问题是第二个 **这是我的主视图 Controller 代码，它有一个 TableView ， TableView 有两个单元格

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

    if collectionView == fieldOfActivityCell().fieldofActivitiesCollectionView {
        let fullfields : String = self.adv.resultValue[0].work_field!
        let fullfieldsArr : [String] = fullfields.components(separatedBy: ",")
        print(fullfieldsArr)
        return fullfieldsArr.count

    } else {

        let extera_infofields : String = self.adv.resultValue[0].extera_info!
        let extera_infofieldsArr : [String] = extera_infofields.components(separatedBy: ",")
        print(extera_infofieldsArr)
        return extera_infofieldsArr.count
    }
}

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

    if collectionView == fieldOfActivityCell().fieldofActivitiesCollectionView {

        let fieldsCells = collectionView.dequeueReusableCell(withReuseIdentifier: "fieldOfActivityCollectionViewCell", for: indexPath) as! fieldOfActivityCollectionViewCell

        let fullfields : String = self.adv.resultValue[0].work_field!
        let fullfieldsArr : [String] = fullfields.components(separatedBy: ",")

        fieldsCells.title.text = fullfieldsArr[indexPath.row]

        return fieldsCells
    }
    else {
        let extera_infoCells = collectionView.dequeueReusableCell(withReuseIdentifier: "extera_infoCollectionViewCell", for: indexPath) as! extera_infoCollectionViewCell

        let extera_info : String = self.adv.resultValue[0].extera_info!
        let extera_infoArr : [String] = extera_info.components(separatedBy: ",")

        extera_infoCells.infoText.text = extera_infoArr[indexPath.row]

        return extera_infoCells
    }
}

这是同一 View Controller 中的 TableView 代码:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    if indexPath.row == 0{

        let fieldCell = self.showAdvTableView.dequeueReusableCell(withIdentifier: "fieldOfActivityCell", for: indexPath) as! fieldOfActivityCell

        return fieldCell

    } else {

        let fieldCell = self.showAdvTableView.dequeueReusableCell(withIdentifier: "extera_infoCell", for: indexPath) as! extera_infoCell

        return fieldCell
   }

这是 TableView 第一个单元格类:

class fieldOfActivityCell: UITableViewCell {

    @IBOutlet weak var fieldofActivitiesCollectionView: UICollectionView!

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

        if let flowLayout = fieldofActivitiesCollectionView.collectionViewLayout as? UICollectionViewFlowLayout { flowLayout.estimatedItemSize = CGSize.init(width: 1.0, height: 1.0) }
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
}

extension fieldOfActivityCell {

    func setCollectionViewDataSourceDelegate
            <D: UICollectionViewDelegate & UICollectionViewDataSource>
    (_ dataSourceDelegate:D , forRow row : Int )

    {
        fieldofActivitiesCollectionView.delegate = dataSourceDelegate
        fieldofActivitiesCollectionView.dataSource = dataSourceDelegate
        fieldofActivitiesCollectionView.reloadData()
    }
}

这是第二个 tableview 单元类:

@IBOutlet weak var extra_infoCollectionView: UICollectionView!

override func awakeFromNib() {
    super.awakeFromNib()

    if let flowLayout = extra_infoCollectionView.collectionViewLayout as? UICollectionViewFlowLayout { flowLayout.estimatedItemSize = CGSize.init(width: 1.0, height: 1.0) }
}
}

 extension extera_infoCell {

    func setCollectionViewDataSourceDelegate
    <D: UICollectionViewDelegate & UICollectionViewDataSource>
    (_ dataSourceDelegate:D , forRow row : Int )

    {
        extra_infoCollectionView.delegate = dataSourceDelegate
        extra_infoCollectionView.dataSource = dataSourceDelegate
        extra_infoCollectionView.reloadData()
    }
}

Answer 1

第一步:使用标签 - 您只需要为它们使用标签，然后使用 if else 来选择使用标签选择了哪个 Collection View ，所以答案是这样的:

if collectionView.tag == 1 {
do some thing//////
}else {
do some thing else}

你应该在 cellForRowAtIndexPath 和 numberOfRows 方法中使用它你也可以将它用于 TableView

第二步:您必须在 CollectionView 数据源的 cellForRowAt 方法中更改要出列的“ Collection View ”的名称:

if collectionView.tag == 1 {
    let cell = yourFirstCollectionView.dequeueReusableCell(...) as yourCell
    ....
    return cell
} else {
    let cell = yourSecondCollectionView.dequeueReusableCell(...) as yourCell
    ....
    return cell
}