我有一个棘手的任务。我有带有两个 tableView、按钮等的 TableUIViewController(父 UIViewController)。此 UIViewController 显示有关咖啡馆中表的信息。

我还有另一个名为 MenuTableViewController 的 Controller (父级是 UITableViewController)，它是显示菜单项列表的单独 View 。只有三个 UI 项目 - 每个单元格中有两个标签和按钮。

想法: 我想以两种不同的方式使用这个 MenuTableViewController。

1. 如果从主菜单转到此 View - 只显示菜单并允许用户编辑每个单元格。 Button.title = "打开"。

2. 如果 View 是从 TableUIViewController 打开的 - 将按钮标题更改为“选择”，如果按下按钮创建订单等则返回 MenuTableViewController。

我发现 perform segue + prepare for segue 对我有用，但如果我使用 segue，我会遇到导航 Controller 的问题 - 我完全失去了“后退”按钮，无法返回主菜单。

所以我认为我可以使用 AddSubView 或一些弹出窗口执行以下步骤:

1. 在 TableUIViewController 中点击按钮

2. 显示 MenuTableViewController

3. 点击某个按钮

4. 返回 TableUIViewController - 理想情况下无需任何重新初始化，以保持所有变量及其值。

但我不明白如何在这里使用 AddSubview。有人可以指导我一下吗？或者提供一些例子。在这里没找到什么好东西。

这是我的类(class):

TableUIViewController

import UIKit
import CoreData

class TableUIViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, GuestAtTableTableViewCellDelegate, OrderInTableTableViewCellDelegate {
    //MARK: variables:
    //The following three variables will be set before segue to this view.
    fileprivate let myGenericFunctions = MyGenericFunctions()
    var tableName: String? = nil
    var currentTable: TablesTable? = nil
    var currentTableSession: TableSessionTable? = nil
    let tableSessionTable = TableSessionTable()
    let guestsTable = GuestsTable()
    fileprivate var countOfGuests: Int {
        get {
            guard currentTableSession != nil else {return 0}
            return guestsTable.getActiveGuestsForTable(tableSession: currentTableSession!)!.count
        }
    }
    fileprivate var guestsTableFetchedResultsController: NSFetchedResultsController<GuestsTable>?
    fileprivate var ordersTableFetchedResultsController: NSFetchedResultsController<OrdersTable>?


    //MARK: IBOutlets
    @IBOutlet weak var tableCapacityLabel: UILabel!
    @IBOutlet weak var tableCountOfGuestsLabel: UILabel!
    @IBOutlet weak var tableOpenTimeLabel: UILabel!
    @IBOutlet weak var tableDescriptionTextView: UITextView!
    @IBAction func closeTableButtonPressed(_ sender: UIButton) {
        guard currentTableSession != nil else {return}
        guestsTable.removeAllGuestsForTable(tableSession: currentTableSession!)
        updateGuestsTableView()
        updateOrdersTableView()
        tableSessionTable.removeTableSession(tableSession: currentTableSession!)
        currentTableSession = nil
        updateLabels()
    }
    @IBOutlet weak var guestsTableView: UITableView!
    @IBOutlet weak var ordersTableView: UITableView!

    @IBAction func addGuestButtonPressed(_ sender: UIButton) {
        if currentTableSession == nil {
            currentTableSession = tableSessionTable.createTableSession(table: currentTable!)
        }
        if let capacity = Int(tableCapacityLabel.text!) {
            guard capacity > countOfGuests else {return}
        }

        let guestsTable = GuestsTable()
        guestsTable.addNewGuest(tableSession: currentTableSession!)
        updateGuestsTableView()
        updateLabels()
    }
    @IBAction func addOrderButtonPressed(_ sender: UIButton) {
        guard currentTableSession != nil else {return}



    }


    //MARK: functions:
    override func viewDidLoad() {
        super.viewDidLoad()
        guestsTableView.dataSource = self
        guestsTableView.delegate = self
        ordersTableView.dataSource = self
        ordersTableView.delegate = self

        updateGuestsTableView()
        updateLabels()
    }


    private func updateLabels() {
        tableCapacityLabel.text = String(describing: currentTable!.tableCapacity)
        tableCountOfGuestsLabel.text = String(describing: countOfGuests)
        if currentTableSession != nil {
            tableOpenTimeLabel.text = String(describing: myGenericFunctions.convertDate(inputDate: currentTableSession!.openTime!))
        } else {
            tableOpenTimeLabel.text = " - "
        }
        if currentTable!.tableDescription != nil {
            tableDescriptionTextView.text = currentTable!.tableDescription
        }
    }

    //MARK: Delegates of cell buttons
    func didPressGuestCellButton(guest: GuestsTable) {
        guestsTable.closeGuest(guest: guest)
        updateLabels()
        updateGuestsTableView()
    }

    func didPressOrderCellButton(order: OrdersTable) {

    }

    //MARK: Functions for tableViews update
    private func updateGuestsTableView () {
        guard currentTableSession != nil else {return}
        let tableView = guestsTableView
        let context = AppDelegate.viewContext
        let request : NSFetchRequest<GuestsTable> = GuestsTable.fetchRequest()
        request.predicate = NSPredicate(format: "table= %@", currentTableSession!)
        request.sortDescriptors = [NSSortDescriptor(key: "openTime", ascending: true, selector: #selector(NSString.localizedCaseInsensitiveCompare(_:)))]
        guestsTableFetchedResultsController = NSFetchedResultsController<GuestsTable>(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
        try? guestsTableFetchedResultsController?.performFetch()
        tableView?.reloadData()
    }

    private func updateOrdersTableView () {
        let tableView = ordersTableView
        let context = AppDelegate.viewContext
        let request : NSFetchRequest<OrdersTable> = OrdersTable.fetchRequest()
        request.sortDescriptors = [NSSortDescriptor(key: "menuItem", ascending: true, selector: #selector(NSString.localizedCaseInsensitiveCompare(_:)))]
        ordersTableFetchedResultsController = NSFetchedResultsController<OrdersTable>(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
        try? ordersTableFetchedResultsController?.performFetch()
        tableView?.reloadData()
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if tableView == self.guestsTableView {
            let cell = tableView.dequeueReusableCell(withIdentifier: "guestCell", for: indexPath) as! GuestAtTableTableViewCell
            if let guest = guestsTableFetchedResultsController?.object(at: indexPath) {
                cell.guestNameLabel.text = guest.guestName
                cell.openTimeLabel.text = "Пришел: " + myGenericFunctions.convertDate(inputDate: guest.openTime!)
                if let closeTime = guest.closeTime {
                    cell.closeTimeLabel.text = "Ушел: " + myGenericFunctions.convertDate(inputDate: closeTime)
                    cell.closeGuestButton.isEnabled = false
                    cell.guestNameLabel.textColor = UIColor.darkGray
                    cell.openTimeLabel.textColor = UIColor.darkGray
                    cell.closeTimeLabel.textColor = UIColor.darkGray
                }
                cell.cellDelegate = self
                cell.guest = guest
            }
            return cell
        }
        else {
            let cell = tableView.dequeueReusableCell(withIdentifier: "orderCell", for: indexPath)
            return cell
        }
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        if tableView == self.guestsTableView {
            return guestsTableFetchedResultsController?.sections?.count ?? 1
        }
        else if tableView == self.ordersTableView {
            return ordersTableFetchedResultsController?.sections?.count ?? 1
        }
        else {return 1}
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if tableView == self.guestsTableView {
            if let sections = guestsTableFetchedResultsController?.sections, sections.count > 0 {
                return sections[section].numberOfObjects
            }
            else {
                return 0
            }
        }
        else if tableView == self.ordersTableView {
            if let sections = ordersTableFetchedResultsController?.sections, sections.count > 0 {
                return sections[section].numberOfObjects
            }
            else {
                return 0
            }
        }
        else {return 0}
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        if tableView == self.guestsTableView {
            if let sections = guestsTableFetchedResultsController?.sections, sections.count > 0 {
                return sections[section].name
            }
            else {
                return nil
            }
        }
        else if tableView == self.ordersTableView {
            if let sections = ordersTableFetchedResultsController?.sections, sections.count > 0 {
                return sections[section].name
            }
            else {
                return nil
            }
        }
        else {return nil}

    }

    func sectionIndexTitles(for tableView: UITableView) -> [String]? {
        if tableView == guestsTableView {
            return guestsTableFetchedResultsController?.sectionIndexTitles
        }
        else {
            return ordersTableFetchedResultsController?.sectionIndexTitles
        }
    }

    func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
        if tableView == guestsTableView {
            return guestsTableFetchedResultsController?.section(forSectionIndexTitle: title, at: index) ?? 0
        }
        else if tableView == ordersTableView {
            return ordersTableFetchedResultsController?.section(forSectionIndexTitle: title, at: index) ?? 0
        }
        else {return 0}
    }

    //Prepare for segues
    /*override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "openMenuToAddOrder" {
            if let menuTVC = segue.destination as? MenuTableViewController {
                menuTVC.isOpenedFromTable = true
                menuTVC.currentTableSession = currentTableSession
                menuTVC.currentTable = currentTable
            }
        }
    }*/
}

ManuTableViewController:

class MenuTableViewController: FetchedResultsTableViewController, MenuTableViewCellDelegate {
    var tableName: String? = nil
    var currentTable: TablesTable? = nil
    var currentTableSession: TableSessionTable? = nil
    var isOpenedFromTable: Bool = false
    let ordersTable = OrdersTable()
    fileprivate var fetchedResultsController: NSFetchedResultsController<MenuTable>?

    override func viewDidLoad() {
        updateMenuTableView()
        self.navigationItem.rightBarButtonItem = self.editButtonItem
    }

    //MARK: delegate of table cell
    func didPressMenuItemCellButton (menuItem: MenuTable) {
        if isOpenedFromTable {
            ordersTable.addOrUpdateOrderForTableSession(tableSession: currentTableSession!, menuItem: menuItem)
            performSegue(withIdentifier: "returnToTableView", sender: self)
        } else {
            //here will be code for editing menu item
        }
    }

    //MARK: Functioms for table view update
    private func updateMenuTableView () {
        let context = AppDelegate.viewContext
        let request : NSFetchRequest<MenuTable> = MenuTable.fetchRequest()
        request.sortDescriptors = [NSSortDescriptor(key: "itemName", ascending: true, selector: #selector(NSString.localizedCaseInsensitiveCompare(_:)))]
        fetchedResultsController = NSFetchedResultsController<MenuTable>(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
        fetchedResultsController?.delegate = self
        try? fetchedResultsController?.performFetch()
        tableView.reloadData()
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "menuCell", for: indexPath) as! MenuTableViewCell
        if let menuTable = fetchedResultsController?.object(at: indexPath) {
            cell.menuItemNameLabel.text = menuTable.itemName
            cell.menuItemDescriptionLabel.text = menuTable.itemDescription
            cell.menuItemPriceLabel.text = String(describing: menuTable.itemPrice)
            if isOpenedFromTable == true {
                cell.button.setTitle("Выбрать", for: UIControlState.normal)
            } else {
                cell.button.setTitle("Открыть", for: UIControlState.normal)
            }
            cell.menuItem = menuTable
            cell.cellDelegate = self
        }
        return cell
    }
    //Prepare for segues
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "returnToTableView" {
            if let tableTVC = segue.destination as? TableUIViewController {
                tableTVC.currentTableSession = currentTableSession
                tableTVC.currentTable = currentTable
                tableTVC.tableName = currentTable?.tableName
            }
        }
    }
}

extension MenuTableViewController {
    override func numberOfSections(in tableView: UITableView) -> Int {
        return fetchedResultsController?.sections?.count ?? 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if let sections = fetchedResultsController?.sections, sections.count > 0 {
            return sections[section].numberOfObjects
        }
        else {
            return 0
        }
    }

    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        if let sections = fetchedResultsController?.sections, sections.count > 0 {
            return sections[section].name
        }
        else {
            return nil
        }
    }

    override func sectionIndexTitles(for tableView: UITableView) -> [String]? {
        return fetchedResultsController?.sectionIndexTitles
    }

    override func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
        return fetchedResultsController?.section(forSectionIndexTitle: title, at: index) ?? 0
    }
}

更新: 这是我的 Storyboard。我有一种感觉，我没有正确使用导航 Controller 。但是在 View 之间没有一些 Controller - 后退按钮不会出现。对不起图片中的俄语文字。

标记为已解决后更新:

我已经删除了 performSegue 并将 controller 中的 segues 放到按钮本身。现在 Navigation controller 保留了 Back 按钮。 还将 Update UI 函数移动到 viewWillAppear 以在 segues 之后保持表更新。

override func viewWillAppear(_ animated: Bool) {
    updateGuestsTableView()
    updateOrdersTableView()
    updateLabels()
    updateOrdersTableView()
}

另一个更新，现在它完全符合我的要求。 我已经添加到由 Menu Cell Button 调用的函数以返回到之前的 ViewController(与 Back 按钮一样):

    //MARK: delegate of table cell
    func didPressMenuItemCellButton (menuItem: MenuTable) {
        if isOpenedFromTable {
            ordersTable.addOrUpdateOrderForTableSession(tableSession: currentTableSession!, 

menuItem: menuItem)
            _ = navigationController?.popViewController(animated: true)
        } else {
            //here will be code for editing menu item
        }
    }

最佳答案

听起来你想要这样的结构:

如果您从主菜单中选择“编辑食物菜单”，您将直接进入“食物菜单”。如果您选择“接单”，您将看到“表格列表”。

如果您选择“编辑食物菜单”，那么您的食物菜单代码应显示“编辑”作为表格中每一行的按钮标题。点击“编辑”将带您进入“编辑菜单项” View 。

如果您选择“接受订单”，然后从列表中选择一张 table ，也会将您带到“食物菜单”，但在这种情况下，您的食物菜单代码应显示“订单"作为按钮标题。点击“订购”会将食品添加到您的数据结构中，或者可能会显示确认警报，或者在此时执行任何其他需要的操作。

因为所有 View 都是同一导航 Controller 结构的一部分，所以您始终可以通过选择导航栏上的标准“<>

希望这是有道理的:)

关于ios - Swift 3.1 UITableViewController 作为 subview 或弹出窗口，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44309653/