嵌套在 CollectionViewCell 中的 TableView

Question

我正在尝试制作 TableViews 的 collectionView，以便每张桌子都包含一个“团队”的玩家。 （这个想法是Players 按他们的评分同样排序，这样每支球队都会在最后。无论如何）我在用合适的球员填充桌子时遇到了一些麻烦。排序/团队制作代码工作正常，但我不知道如何从 tableView dataSource 方法中引用每个表所在的单元格，我需要用它们各自的玩家填充正确的表。如果您感到困惑，也许下面的代码会阐明我要做什么

class myCollectionViewController: UICollectionViewController, UITableViewDelegate, UITableViewDataSource {

    //MARK: Properties

    //These value are passed by the previous ViewController in PrepareForSegue
    var numberOfTeams = Int?() //2
    var team = Array<Array<Players>>() //The 2D array of Players which contains the already sorted teams

    //for right now this is my temporary solution. See below in TableView Data Source
    var collectionIndex = 0

    //MARK: UICollectionViewDataSource

    override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }

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

        if numberOfTeams != nil
            {return numberOfTeams!}
        else
            {return 2}
    }

    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! myCollectionViewCell

        cell.teamTable.dataSource = self
        cell.teamTable.delegate = self
       //teamTable is a UITableView and is set as an Outlet in the CollectionViewCell. Here I'm just setting it 

        return cell
    }

    //MARK: TableView DataSource

    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        //add correct amount of rows
        return team[0].count
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        //reset for refresh so index won't go out of bounds of teams Array
        if collectionIndex == numberOfTeams
            {collectionIndex = 0
             print("reset")
        }

（这（就在上面）是失败的地方。视图将正确加载，表格按应有的方式填充。但是如果您滚动到其中一个表格的底部，将调用此方法并刷新表格再次向上滚动时显示错误的数据。代码在下面继续）

        let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! teamTableViewCell
        cell.playerName.text = team[collectionIndex][indexPath.row].name
        //playerName is a UILabel set as an outlet in the teamTableViewCell class. also, The class Player has a property "name"

        //once all players are cycled through, add 1 to collectionIndex 
        if team[collectionIndex][indexPath.row] === team[collectionIndex].last
           {collectionIndex += 1}

        return cell
    }
}

如上面括号中所述，当前的实现存在问题，只是临时解决方案，因此我可以继续处理代码的其他方面。我需要的是引用tableView所在的collectionViewCell并更改行

cell.playerName.text = team[collectionIndex][indexPath.row].name

到

cell.playerName.text = team[--"colletionViewCellIndexHere"--][indexPath.row].name

但我不知道如何在tableview: CellForRowAtIndexPath: 方法中引用集合单元格 indexPath.item 或行

我尝试与tableView.superView 混在一起，但没有运气。任何帮助将不胜感激。提前致谢

Answer 1

做你想做的更好的方法是把管理每个表视图的责任交给一个单独的视图控制器TeamViewController。每个TeamViewController 都有自己的team 属性，即一组玩家。创建集合视图单元格时，添加新的TeamViewController 作为子视图控制器，并将其视图添加为单元格的子视图。只是不要忘记单元格重用 - 您只想向每个单元格添加 一个 TeamViewController。

这样做将提供更好的逻辑分离，并使管理您的表视图更加简单。

编辑：

正确处理单元重用的示例：

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! TeamsCell
    embedTeamInTeamsCell(cell, atIndexPath: indexPath)
}

func embedTeamInTeamsCell(cell: TeamsCell, atIndexPath indexPath: NSIndexPath) {
    if cell.teamViewController?.team == teams[indexPath.item] {
        // The cell already has a team view controller, but it's for the wrong team – remove it
        detachTeamFromTeamsCell(cell)
    }

    if cell.teamViewController == nil {
        // The cell doesn't currently have a team view controller – create a new one and add it
        let teamVC = self.storyboard?.instantiateViewControllerWithIdentifier("TeamViewController") as! TeamViewController
        addChildViewController(teamVC)
        cell.addSubview(teamVC.view)
        // ... setup constraints on the newly added subview, or set frame
        teamVC.didMoveToParentViewController(self)
        cell.teamViewController = teamVC
    }
}

func detachTeamFromTeamsCell(cell: TeamsCell) {
    if let teamVC = cell.teamViewController {
        teamVC.willMoveToParentViewController(nil)
        cell.teamViewController = nil
        teamVC.view.removeFromSuperview()
        teamVC.removeFromParentViewController()
    }
}

实际上，当您需要更改单元中的嵌入式团队时，最好只重用当前嵌入的 TeamViewController 实例而不是完全丢弃它们。然后，只需更改TeamViewController 上的team 属性就足以重新配置该视图控制器以显示新团队（也许您只需要在team 的didSet 属性观察器中调用tableView.reloadData - 取决于你如何组织你的课程）：

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! TeamsCell
    if cell.teamViewController == nil {
        // The cell doesn't currently have a team view controller – create a new one and add it
        let teamVC = self.storyboard?.instantiateViewControllerWithIdentifier("TeamViewController") as! TeamViewController
        addChildViewController(teamVC)
        cell.addSubview(teamVC.view)
        // ... setup constraints on the newly added subview, or set frame
        teamVC.didMoveToParentViewController(self)
        cell.teamViewController = teamVC
    }

    cell.teamViewController!.team = teams[indexPath.item]
}

class TeamViewController: UITableViewController {
    //...

    var team: Team? {
        didSet { tableView.reloadData() }
    }
}