Question

我想在此开头说我是IOS开发的新手。我在这里发现了与我要问的问题类似的帖子： Swift 4 Split View Controller Detail Replaces Master 但是，这并不能解决我的问题。但是，我的问题非常相似，我有一个拆分视图控制器，它是我的根视图，它可以按预期工作。从主表中选择一个项目会更改详细视图控制器。

这是我制作的情节提要。顶部是第一个splitview（根视图）底部的表格视图是侧面推动菜单，在这里我可以导航到左侧部分。这是我遇到问题的第二个拆分视图。

当我添加第二个视图控制器时，我的问题开始了。当我导航到第二个视图控制器并尝试在主表（现在在第二个拆分视图中）中选择一个项目时，它不会更新第二个拆分视图的详细信息视图控制器。

基本上，我复制并粘贴了已经为第一个拆分视图编写的代码，但是显然我遗漏了一些东西。

这是我的应用程序代表（我开始认为应用程序代表是我的问题所在）

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UISplitViewControllerDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]?) -> Bool {
        guard let splitViewController = window!.rootViewController as? UISplitViewController,
            let leftNavController = splitViewController.viewControllers.first as? UINavigationController,
            let masterViewController = leftNavController.topViewController as? MasterVC,
//            let rightNavController = splitViewController.viewControllers.last as? UINavigationController,
            let detailViewController = splitViewController.viewControllers.last as? DetailVC
            else { fatalError() }

//            else {return true}
        let firstMail = masterViewController.mail.first
        detailViewController.mails = firstMail
        masterViewController.delegate = detailViewController
        masterViewController.navigationItem.leftItemsSupplementBackButton = true
        detailViewController.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem
        UISearchBar.appearance().tintColor = .blue
        UINavigationBar.appearance().tintColor = .blue
        splitViewController.preferredDisplayMode = .automatic
        splitViewController.delegate = self

        return true
    }


    func splitViewController(_ splitViewController: UISplitViewController, collapseSecondary secondaryViewController: UIViewController, onto primaryViewController: UIViewController) -> Bool {
        guard let secondaryAsNavController = secondaryViewController as? UINavigationController else {return false}
        guard let topAsDetailController = secondaryAsNavController.topViewController as? DetailVC else {return false}
        if topAsDetailController.detailMail == nil {
            return true
        }
        return false
    }
}

这是第一个拆分视图控制器（根视图/ masterViewController）

import UIKit

protocol MailSelectionDelegate: class {
    func mailSelected(_ newMail: Mailing)
}

class MasterVC: UITableViewController{

    @IBOutlet weak var SearchFooter: SearchFooter!


    var filteredMail = [Mailing]()
    var mail = [Mailing]()
    var detailViewController: DetailVC? = nil
    let searchController = UISearchController(searchResultsController: nil)
    weak var delegate: MailSelectionDelegate?


    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "Mail Received Today"
        searchController.searchResultsUpdater = self
        searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchBar.placeholder = "Search"
        navigationItem.searchController = searchController
        definesPresentationContext = true
        //scope bar
        searchController.searchBar.scopeButtonTitles = ["###","###","###","###]
        searchController.searchBar.delegate = self
        //search footer
        tableView.tableFooterView = SearchFooter

        mail = [

            Mailing(from: "###", to: "###",department: "###", trackingId: "019283", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "02346", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "056894", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "076767", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "098789", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "012345", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "021342", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from:"###", to: "###", department: "###", trackingId: "032312", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "034432", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "011211", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###",department: "###", trackingId: "099999", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "044323", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "098899", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "011211", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "084449", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "056788", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "022222", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from:"###", to: "###", department: "###", trackingId: "093753", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "01572", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailing(from: "###", to: "###", department: "###", trackingId: "059678", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false)
        ]

    }

    override func viewWillAppear(_ animated: Bool) {
        if splitViewController!.isCollapsed {
            if let selectionIndexPath = tableView.indexPathForSelectedRow {
                tableView.deselectRow(at: selectionIndexPath, animated: animated)
            }
        }
        super.viewWillAppear(animated)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if isFiltering() {
            SearchFooter.setIsFilteringToShow(filteredItemCount: filteredMail.count, of: mail.count)
            return filteredMail.count
        }
        SearchFooter.setNotFiltering()
        return mail.count
    }

    func filterContentForSearchText(_ searchText: String, scope: String = "All") {
        filteredMail = mail.filter({(mail: Mailing)-> Bool in
            let doesMatch = (scope == "All") || (mail.trackingId == scope) || (scope == "TrackingID") || (mail.department == scope) || (scope == "Department")
            //            return mail.from.lowercased().contains(searchText.lowercased())
            if searchBarIsEmpty() {
                tableView.reloadData()
                return doesMatch
                //                return mail.from.lowercased().contains(searchText.lowercased())
            } else {
                return doesMatch && mail.trackingId.lowercased().contains(searchText.lowercased()) || mail.from.lowercased().contains(searchText.lowercased()) || mail.department.lowercased().contains(searchText.lowercased())
            }
        })
        tableView.reloadData()
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let searchCell = tableView.dequeueReusableCell(withIdentifier: "searchCell", for: indexPath)
        let searchMail: Mailing

        if isFiltering() {
            searchMail = filteredMail[indexPath.row]
        } else {
            searchMail = mail[indexPath.row]
        }
        searchCell.textLabel!.text = searchMail.from
        searchCell.textLabel?.textAlignment = .center

        return searchCell
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "showDetail" {
            if let indexPath = tableView.indexPathForSelectedRow {
                let mails: Mailing
                if isFiltering() {
                    mails = filteredMail[indexPath.row]
                } else {
                    mails = mail[indexPath.row]
                }

                let controller = (segue.destination as! UINavigationController).topViewController as! DetailVC
                controller.detailMail = mails
                controller.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
                controller.navigationItem.leftItemsSupplementBackButton = true

            }
        }
    }


    func searchBarIsEmpty() -> Bool {
        return searchController.searchBar.text?.isEmpty ?? true
    }

    func isFiltering() -> Bool {
        let searchBarScopeIsFiltering = searchController.searchBar.selectedScopeButtonIndex != 0
        return searchController.isActive && (!searchBarIsEmpty() || searchBarScopeIsFiltering)
    }


    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
        let selectedMail = mail[indexPath.row]
        delegate?.mailSelected(selectedMail)
        if let detailViewController = delegate as? DetailVC,
            let detailNavigationController = detailViewController.navigationController {
            splitViewController?.showDetailViewController(detailNavigationController, sender: nil)
        }

        if isFiltering() {
            tableView.reloadData()
            let selectedMail = filteredMail[indexPath.row]
            delegate?.mailSelected(selectedMail)
        }

        searchController.dimsBackgroundDuringPresentation = false

    }

}


extension MasterVC: UISearchBarDelegate {
    func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
        filterContentForSearchText(searchBar.text!, scope: searchBar.scopeButtonTitles![selectedScope])
    }
}
extension MasterVC: UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        let searchBar = searchController.searchBar
        let scope = searchBar.scopeButtonTitles![searchBar.selectedScopeButtonIndex]
        filterContentForSearchText(searchController.searchBar.text!, scope: scope)
    }
}

这是masterViewController的detailViewController。当在主表中选择一个单元格时，便可以更新详细视图。

import UIKit

class DetailVC: UIViewController {

    @IBOutlet weak var fromLabel: UILabel!
    @IBOutlet weak var toLabel: UILabel!
    @IBOutlet weak var deliveryDateLabel: UILabel!
    @IBOutlet weak var trackingIdLabel: UILabel!
    @IBOutlet weak var dateReceivedLabel: UILabel!
    @IBOutlet weak var departmentLabel: UILabel!    
    @IBOutlet weak var signauteOnFile: UIImageView!


    var mails: Mailing? {
        didSet {
            refreshUI()
        }
    }

    var detailMail: Mailing? {
        didSet {
            configureView()

        }
    }

    func refreshUI() {
        loadViewIfNeeded()
        fromLabel.text = mails?.from
        toLabel.text = mails?.to
        deliveryDateLabel.text = mails?.deliveryDate
        trackingIdLabel.text = mails?.trackingId
        dateReceivedLabel.text = mails?.receivedDate
        departmentLabel.text = mails?.department
    }


    func configureView() {
        if let detailMail = detailMail {
            title = detailMail.from
        }
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        configureView()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

}

extension DetailVC: MailSelectionDelegate {
    func mailSelected(_ newMails: Mailing){
        mails = newMails
    }
}

现在这是第二个拆分视图的第二个masterViewController：在下面，您会注意到一些变量中有'typos'。这是我天真的尝试，以解决由于“无效的变量名重新声明”而引起的常量错误。为了解决这个问题，我只是在每个变量的末尾添加了一个“ s”，以使其有所不同。也许正是在这里，我错过了一些天真尝试所弄乱的东西...

import UIKit

protocol MailSelectionDelegates: class {
    func mailSelecteds(_ newMails: Mailings)
}

class MasterView2: UITableViewController, UISplitViewControllerDelegate {

    @IBOutlet weak var SearchFooter2: SearchFooter2!
    var mailsss = [Mailings]()
    var filteredMails = [Mailings]()
    var detailViewController: DetailVC2? = nil
    let searchControllers = UISearchController(searchResultsController: nil)
    weak var delegates: MailSelectionDelegates?

    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "#####"
        searchControllers.searchResultsUpdater = self
        searchControllers.obscuresBackgroundDuringPresentation = false
        searchControllers.searchBar.placeholder = "Search"
        navigationItem.searchController = searchControllers
        definesPresentationContext = true
        searchControllers.searchBar.scopeButtonTitles = ["###","###","###"]
        searchControllers.searchBar.delegate = self
        tableView.tableFooterView = SearchFooterWarehouse
        //fixingSplitViews
        //this didnt do anything... grrr
        self.splitViewController!.delegate = self
        self.splitViewController!.preferredDisplayMode = UISplitViewControllerDisplayMode.allVisible
        self.extendedLayoutIncludesOpaqueBars = true

        mailsss = [

            Mailings(from: "###", to: "###",department: "###", trackingId: "019283", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "02346", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "056894", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "076767", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "098789", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "012345", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "021342", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from:"###", to: "###", department: "###", trackingId: "032312", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "034432", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "011211", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###",department: "###", trackingId: "099999", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "044323", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "098899", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "011211", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "084449", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "056788", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "022222", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from:"###", to: "###", department: "###", trackingId: "093753", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "01572", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false),
            Mailings(from: "###", to: "###", department: "###", trackingId: "059678", receivedDate: "02/12/2018", deliveryDate: "03/12/2018", signedFor: false, expanded: false)
        ]
    }

    override func viewWillAppear(_ animated: Bool) {
        if splitViewController!.isCollapsed {
            if let selectionIndexPaths = tableView.indexPathForSelectedRow {
                tableView.deselectRow(at: selectionIndexPaths, animated: animated)
            }

        }
        super.viewWillAppear(animated)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if isFilterings() {
            SearchFooterWarehouse.setIsFilteringToShows(filteredItemCount: filteredMails.count, of: mailsss.count)
            return filteredMails.count
        }
        SearchFooter2.setNotFilterings()
        return mailsss.count

    }

    func filterContentForSearchTexts(_ searchText: String, scope: String = "All") {
        filteredMails = mailsss.filter({(mailsss: Mailings)-> Bool in
            let doesMatchs = (scope == "All") || (mailsss.trackingId == scope) || (scope == "TrackingID") ||
                (mailsss.department == scope) || (scope == "Department")
            if searchBarIsEmpty() {
                tableView.reloadData()
                return doesMatchs
            } else {
                return doesMatchs && mailsss.trackingId.lowercased().contains(searchText.lowercased()) || mailsss.from.lowercased().contains(searchText.lowercased()) || mailsss.department.lowercased().contains(searchText.lowercased())

            }
        })
        tableView.reloadData()
    }
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let searchCells = tableView.dequeueReusableCell(withIdentifier: "searchingCell", for: indexPath)
        let searchMails: Mailings
        if isFilterings() {
            searchMails = filteredMails[indexPath.row]
        } else {
            searchMails = mailsss[indexPath.row]
        }
        searchCells.textLabel!.text = searchMails.from
        searchCells.textLabel?.textAlignment = .center

        return searchCells
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "showDetail" {
            if let indexPaths = tableView.indexPathForSelectedRow {
                let mailss: Mailings
                if isFilterings() {
                    mailss = filteredMails[indexPaths.row]
                } else {
                    mailss = mailsss[indexPaths.row]
                }
                let controllers = (segue.destination as! UINavigationController).topViewController as! DetailVC2
                controllers.detailMails = mailss
                controllers.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
                controllers.navigationItem.leftItemsSupplementBackButton = true
            }
        }
    }

    func searchBarIsEmpty() -> Bool {
        return searchControllers.searchBar.text?.isEmpty ?? true
    }

    func isFilterings() -> Bool {
        let searchBarScopeIsFiltering = searchControllers.searchBar.selectedScopeButtonIndex != 0
        return searchControllers.isActive && (!searchBarIsEmpty() || searchBarScopeIsFiltering)
    }
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let selectedMail = mailsss[indexPath.row]
        delegates?.mailSelecteds(selectedMail)
        if let detailViewController = delegates as? DetailVC2,
            let detailNavigationController = detailViewController.navigationController {
            splitViewController?.showDetailViewController(detailNavigationController, sender: nil)
        }
        print("step1")
        tableView.reloadData()

        if isFilterings() {
            tableView.reloadData()
            let selectedMail = filteredMails[indexPath.row]
            delegates?.mailSelecteds(selectedMail)
        } 
        searchControllers.dimsBackgroundDuringPresentation = false
//        tableView.reloadRows(at: [indexPath], with: .fade)
    }

    func splitViewController(splitViewController: UISplitViewController, collapseSecondaryViewController secondaryViewController: UIViewController, ontoPrimaryViewController primaryViewController: UIViewController) -> Bool {
        return true
    }

}    
extension MasterView2: UISearchBarDelegate {
    func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
        filterContentForSearchTexts(searchBar.text!, scope: searchBar.scopeButtonTitles![selectedScope])
    }
}

extension MasterView2: UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        let searchBar = searchControllers.searchBar
        let scope = searchBar.scopeButtonTitles![searchBar.selectedScopeButtonIndex]
        filterContentForSearchTexts(searchController.searchBar.text!, scope: scope)
    }
}

现在是第二个主视图控制器的第二个Detail视图控制器。

import UIKit

class DetailVC2: UIViewController {

    @IBOutlet weak var fromLabels: UILabel!
    @IBOutlet weak var toLabels: UILabel!
    @IBOutlet weak var departmentLabels: UILabel!
    @IBOutlet weak var deliveryDateLabels: UILabel!
    @IBOutlet weak var trackingIdLabels: UILabel!
    @IBOutlet weak var dateReceivedLabels: UILabel!

    var wareMail: Mailings? {
        didSet {
            refreshUIS()
        }
    }

    var detailMails: Mailings!{
        didSet {
            configureViews()
        }
    }

    func refreshUIS() {
        loadViewIfNeeded()
        fromLabels.text = wareMail?.from
        toLabels.text = wareMail?.to
        deliveryDateLabels.text = wareMail?.deliveryDate
        trackingIdLabels.text = wareMail?.trackingId
        dateReceivedLabels.text = wareMail?.receivedDate
        departmentLabels.text = wareMail?.department
    }


    func configureViews() {
        if let detailMails = detailMails {
            title = detailMails.from
        }
    }


        override func viewDidLoad() {
            super.viewDidLoad()
            configureViews()

            // Do any additional setup after loading the view.
        }

        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }

    }

        extension DetailVC2: MailSelectionDelegates{

            func mailSelecteds(_ newMails: Mailings) {
                wareMail = newMails
            }
        }

我想念什么？

运行应用程序并选择第二个masterclass单元时，没有错误代码。

Swift 4，xcode，多个拆分视图控制器，第二个拆分视图masterClass不会更新第二个DetailViewController

0 个答案: