Question

请参见下面的代码。首先，我想说我是swift和xcode的新手。

我正在尝试使用此处的以下代码片段创建序列：

UA-xxxxxxx-4

不幸的是，我遇到一个错误：线程1：在下面的AppDelegate上发出SIGABRT信号

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if(indexPath.section == 0) {
        if(indexPath.row == 3) {
            dismiss(animated: true, completion: nil)
            self.performSegue(withIdentifier: "warehouse", sender: self)
        }

    }
}

我已经搜索了此错误代码，它似乎与丢失或错误代码有关。而且由于我是新手，所以我无法弄清自己的缺失。下面是tableView的整个代码段，我希望从中执行选择到新的视图控制器

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 detailViewController = splitViewController.viewControllers.last as? DetailVC
            else { fatalError() }

        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
    }

}

编辑----

抱歉，这是我忘记显示的日志。

import UIKit

class SideMenuTable: UITableViewController {


    var menu = [Menu]()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "Change Menu View"

        menu = [
            Menu(title: "Main"),
            Menu(title: "Departments"),
            Menu(title: "Deliveries"),
            Menu(title: "Warehouse"),
            Menu(title: "Help")
        ]


    }

    override func viewWillAppear(_ animated: Bool) {
        if tableView.isHidden {
            if let selectionIndexPath = tableView.indexPathForSelectedRow {
                tableView.deselectRow(at: selectionIndexPath, animated: animated)
            }
        } else if tableView.isFocused {
            if let selectionIndexPaths = tableView.indexPathForSelectedRow {
                tableView.deselectRow(at: selectionIndexPaths, animated: animated)
            }
        }
        super.viewWillAppear(animated)
    }


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

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return 5
    }


    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "sideCell", for: indexPath)
        let menuSide: Menu

        menuSide = menu[indexPath.row]

        cell.textLabel!.text = menuSide.title
        cell.textLabel?.textAlignment = .center

        return cell
    }



    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "Warehouse" {
            performSegue(withIdentifier: "Warehouse", sender: self)
            }
        }

Answer 1

错误消息很清楚：

从情节提要“ Main”中实例化了具有标识符“ UIViewController-gFD-aE-X8s”的视图控制器，但未获得UITableView。

因此，情节提要中此视图控制器的配置有问题。它应该是一个UITableViewController，但显然不是，或者很可能是（很可能），您已经不小心解开了从视图控制器运行到表视图的View出口，并将其连接到其他东西。

Answer 2

仅此递归调用

 performSegue(withIdentifier: "Warehouse", sender: self)

在此处的prepareForSegue

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "Warehouse" {
        performSegue(withIdentifier: "Warehouse", sender: self)
    }
 }

Swift 4，错误，UITableViewController perfrom segue，线程1：信号SIGABRT

2 个答案: