Swift - 无法通过导航控制器中的自定义选项卡寻呼机传递数据

Question

我跟随了关于如何在导航控制器中实现自定义选项卡寻呼机的教程。我的设置看起来像这样。在BuyStatsTapPager（右侧）上，您应该看到您可以在“购买”和“比赛”之间切换。

这基本上通过实例取决于被点击其子标签视图控制器的工作原理。问题是我也有这个类中的数据（我已经成功地为前一个视图控制器准备for segue方法设置'var selectedPlayerBuyStats'），我需要将它传递给实例化的控制器。

倒在'updateView（）'的底部我以为我有一个想法，因为我可以访问子视图控制器的表格来设置它的大小和尺寸。我有线评论说，不工作。 IDE成功地从我需要设置的子视图控制器中查找属性，但是当我真正尝试将子视图控制器中的数据设置为零时。有没有另一种方法可以尝试做到这一点？由于

import UIKit 



class BuyStatsTabPager: BuyStats{ 


@IBOutlet var segmentedControl: UISegmentedControl! 
@IBOutlet weak var scoreKey: UIBarButtonItem! 
@IBOutlet weak var standings: UIBarButtonItem! 

var selectedPlayerBuyStats: Player! = nil 

override func viewDidLoad() { 

    navigationController?.navigationBar.barTintColor = UIColor(red: 27/255, green: 27/255, blue: 27/255, alpha: 1) 

    scoreKey.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Helvetica", size: 13.0)!], for: UIControlState.normal) 
    scoreKey.tintColor = UIColor.blue 

    standings.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Helvetica", size: 13.0)!], for: UIControlState.normal) 
    standings.tintColor = UIColor.blue 


    setupView() 
} 

private func setupView() { 
    setupSegmentedControl() 
    updateView() 
} 

private func setupSegmentedControl() { 
    // Configure Segmented Control 
    segmentedControl.removeAllSegments() 
    segmentedControl.insertSegment(withTitle: "Buy", at: 0, animated: false) 
    segmentedControl.insertSegment(withTitle: "Score", at: 1, animated: false) 
    segmentedControl.addTarget(self, action: #selector(selectionDidChange(_:)), for: .valueChanged) 
    segmentedControl.selectedSegmentIndex = 0 
} 

func selectionDidChange(_ sender: UISegmentedControl) { 
    updateView() 
} 


private lazy var viewContestTab: BuyStatsTab = { 
    // Load Storyboard 
    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main) 

    // Instantiate View Controller 
    var viewController = storyboard.instantiateViewController(withIdentifier: "BuyStatsTab") as! BuyStatsTab 


    // Add View Controller as Child View Controller 
    self.add(asChildViewController: viewController) 

    return viewController 
}() 

private lazy var viewRoundTab: BuyStatsContestTab = { 
    // Load Storyboard 
    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main) 

    // Instantiate View Controller 
    var viewController = storyboard.instantiateViewController(withIdentifier: "BuyStatsContestTab") as! BuyStatsContestTab 




    // Add View Controller as Child View Controller 
    self.add(asChildViewController: viewController) 

    return viewController 
}() 

private func add(asChildViewController viewController: UIViewController) { 
    // Add Child View Controller 
    addChildViewController(viewController) 

    // Add Child View as Subview 
    view.addSubview(viewController.view) 

    // Configure Child View 
    viewController.view.frame = view.bounds 
    viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight] 

    // Notify Child View Controller 
    viewController.didMove(toParentViewController: self) 
} 

private func remove(asChildViewController viewController: UIViewController) { 
    // Notify Child View Controller 
    viewController.willMove(toParentViewController: nil) 

    // Remove Child View From Superview 
    viewController.view.removeFromSuperview() 

    // Notify Child View Controller 
    viewController.removeFromParentViewController() 
} 

private func updateView() { 
    if segmentedControl.selectedSegmentIndex == 0 { 

     //this is working so I have the data I need to pass 
     print(selectedPlayerBuyStats.p) 

     let position = viewRoundTab.tableView.contentOffset.y; 
     viewContestTab.tableView.contentOffset = CGPoint(x:0, y:position); 

     //but it isn't working this way 
     //viewContestTab.selectedPlayer = selectedPlayerBuyStats 


     remove(asChildViewController: viewRoundTab) 
     add(asChildViewController: viewContestTab) 
    } else { 


     print(selectedPlayerBuyStats.Name) 

     let position = viewContestTab.tableView.contentOffset.y; 
     viewRoundTab.tableView.contentOffset = CGPoint(x:0, y:position); 

     //viewRoundTab.selectedPlayer = selectedPlayerBuyStats 

     remove(asChildViewController: viewContestTab) 
     add(asChildViewController: viewRoundTab) 
    } 
} 


} 

编辑：

所以我试图使用赛格瑞在标签寻呼机类，但仍然有问题做好准备。 1.我不知道如何检查数据应该传送到哪个孩子班。 2.即使我只是像这样向第一个孩子班发送数据，对方仍然没有数据。

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 


     let buyStats = segue.destination as! BuyStatsTab 

     buyStats.selectedPlayer = selectedPlayer 


} 

这是第一个收件人子视图控制器。

class BuyStatsTab: UIViewController, UITableViewDelegate, UITableViewDataSource{ 

@IBOutlet var tableView: UITableView! 

let cellReuseIdentifier = "cell" 

var stats = [BuyStat]() 

var selectedPlayer: Player! = nil 


override func viewDidLoad() { 
    super.viewDidLoad() 

    self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellReuseIdentifier) 
    self.tableView.rowHeight = 70.0 
    self.tableView.tableFooterView = UIView() 
    tableView.delegate = self 
    tableView.dataSource = self 


    stats = [ 
      BuyStat(purchaseAmount: 0.0, category: "Pts", average: selectedPlayer.p, price: "$75"), 
      BuyStat(purchaseAmount: 0.0, category: "Reb", average: 6.5, price: "$175"), 
      BuyStat(purchaseAmount: 0.0, category: "Ast", average: 6.7, price: "$200"), 
      BuyStat(purchaseAmount: 0.0, category: "Stl", average: 2.2, price: "$300"), 
      BuyStat(purchaseAmount: 0.0, category: "Blk", average: 0.4, price: "$325"), 
      BuyStat(purchaseAmount: 0.0, category: "3pt", average: 3.3, price: "$325"), 
      BuyStat(purchaseAmount: 0.0, category: "TO", average: 2.4, price: "$350")] 

    tableView.reloadData() 

} 

selectedPlayer.p在数组中应该有数据。

Answer 1

基于评论我能够得到确切的答案。我只需要将数据设置在lazy变量viewContestTab中，而不是在updateView（）中进一步设置。我认为在updateView（）中这样做会起作用，因为教程让我从那里访问tableview。我仍然不确定为什么我可以在updateView（）中访问tableview但不设置其他数据。如果有人认为这应该得到更好的解释，我会很乐意给他们最好的答案。

private lazy var viewRoundTab: BuyStatsContestTab = { 

    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main) 

    var viewController = storyboard.instantiateViewController(withIdentifier: "BuyStatsContestTab") as! BuyStatsContestTab 

    viewController.selectedPlayer = self.selectedPlayerBuyStats 

    self.add(asChildViewController: viewController) 

    return viewController 
}()