ios - 线程 1 : signal SIGABRT in swift

Question

我正在制作 iOS Todo 应用程序，但 AppDelegate.swift 中的标题出现错误

我尝试删除 Main.storyboard 中的 DetailViewController但发生了同样的错误

MemoListVC.swift

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    let row = self.appDelegate.memolist[indexPath.row]

    guard let vc = self.storyboard?.instantiateViewController(withIdentifier: "MemoRead") as? MemoReadVC else {
      return
    }

MemoDetailVC.swift

import UIKit

class MemoDetailVC: UITableViewController {

    var param: MemoData?

    @IBOutlet var subject: UILabel!
    @IBOutlet var contents: UILabel!
    @IBOutlet var img: UIImageView!

    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

        self.subject.text = param?.title
        self.contents.text = param?.contents
        self.img.image = param?.image

        let formatter = DateFormatter()
        formatter.dateFormat = "dd일 HH:mm"
        let dateString = formatter.string(from: (param?.date)!)

        self.navigationItem.title = dateString
    }

}

AppDelegate.swift

import UIKit
import CoreData

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var memolist = [MemoData]() 

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }

错误

2019-08-25 02:30:08.049965+0900 MyMemory[39157:1944071] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UITableViewController loadView] instantiated view controller with identifier "MemoDetail" from storyboard "Main", but didn't get a 

Answer 1

在 MemoListVC.swift 中，我注意到您使用标识符“MemoRead”实例化了 View Controller 。该标识符是否与您在 Storyboard中为要实例化的 View Controller 设置的标识符相同？如果不是，这可能就是导致您的代码失败的原因。

如果不相同，则转到 Storyboard，选择 View Controller ，然后转到右侧检查器侧边栏上的身份检查器(Xcode 10 中左侧第三个图标)，然后更改名称您在 MemoListVC.swift 中用于实例化的标识符，为“ Storyboard ID”下的 Storyboard身份检查器中列出的标识符。