TableView 嵌套在 CollectionViewCell 中

Question

我正在尝试制作 TableView 的 collectionView，以便每个 table 将包含 "team" 个玩家。（想法是 Players 按他们的评分平均排序，这样每支球队最后都会持平。无论如何）我在用合适的球员填充 table 时遇到了一些麻烦。 sorting/team-making 代码工作正常，但我无法弄清楚如何从 tableView dataSource 方法中引用每个 table 所在的单元格，我需要填充正确的方法tables 与他们各自的球员。如果您感到困惑，也许下面的代码会阐明我正在尝试做的事情

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）是它失败的地方。视图将正确加载，tables 应该填充。但是如果你滚动到其中一个 tables 的底部，此方法将被调用，并在您再次向上滚动时用错误的数据刷新 table。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
    }
}

如上括号所述，当前实现存在问题，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

但我不知道如何从 tableview: CellForRowAtIndexPath: 方法

中引用集合单元格 indexPath.item 或行

我试过 tableView.superView，但没有成功。任何帮助将不胜感激。提前致谢

Answer 1

更好的方法是将管理每个 table 视图的责任交给单独的视图控制器 TeamViewController。每个 TeamViewController 都有自己的 team 属性，一组玩家。创建集合视图单元格时，添加一个新的 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 - 您只想将 one TeamViewController 添加到每个单元格。

这样做可以更好地分离逻辑，并使管理您的 table 视图变得更加简单。

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，重用当前嵌入的 TeamViewController 实例而不是完全丢弃它们可能会更好。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 属性观察者——取决于你如何构建你的 class):

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() }
    }
}

TableView 嵌套在 CollectionViewCell 中

TableView nested in CollectionViewCell

arrays

uitableview

ios

uicollectionview

swift