Question

我试图通过使用Segue的更改行数来将数据从VC（GameCreatingView）传递到嵌入式TableView（PlayersTableView）的方法，但这似乎无效。

第一个文件：

class GameCreatingViewController: UIViewController {
    var newGame = Game()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem
        newGame = Game()
        newGame.playerBook?.NumberOfPlayers = 2
        print(newGame.playerBook?.NumberOfPlayers)
        for  i in 1...6 {
            newGame.playerBook?.players[i].number = i

            if i <= 2 {
                newGame.playerBook?.players[i].alive = true
            } else {
                newGame.playerBook?.players[i].alive = false
            }
        }

    }
    @IBOutlet weak var numberOfPlayers: UILabel!
    @IBAction func changePlayers(_ sender: UIStepper) {
        numberOfPlayers.text = String(Int(sender.value))
        newGame.playerBook?.NumberOfPlayers = Int(sender.value)
        performSegue(withIdentifier: SetNames, sender: Any?)
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "StartGame" {
            guard let destination = segue.destination as? PlayersTableViewController else { return }
            guard let newGame = sender as? Game else { return }


            let tableGame = newGame

            destination.currentGame = tableGame
        }

        if segue.identifier == "SetNames" {
            guard let destination = segue.destination as? GameViewController else { return }
            guard let newGame = sender as? Game else { return }

            let gameToPlay = newGame

            destination.currentGame = gameToPlay
        }



    }

第二个文件：

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        let numberOfRows = currentGame.playerBook?.NumberOfPlayers ?? 3
        return currentGame.playerBook?.NumberOfPlayers ?? 3
        print("Rows\(numberOfRows)")
    }

行数不变，因此总是有3行。

my storyboard

Answer 1

在ContainerView中嵌入另一个视图控制器时，将在加载父视图控制器时执行segue。您可以获取子视图控制器引用并像这样传递数据。

@IBAction func changePlayers(_ sender: UIStepper) {
    numberOfPlayers.text = String(Int(sender.value))
    newGame.playerBook?.NumberOfPlayers = Int(sender.value)
    if let vc = self.childViewControllers.first(where: { $0 is PlayersTableViewController }) as? PlayersTableViewController {
        vc.currentGame = self.newGame
        vc.tableView.reloadData()
    }
    if let vc = self.childViewControllers.first(where: { $0 is GameViewController }) as? GameViewController {
        vc.currentGame = self.newGame
        vc.tableView.reloadData()
    }
}

如何使用步进器将数据从VC传递到嵌入式TableView

1 个答案: