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iOS Introduction to Table Views Static Table Views for Detail Interfaces Displaying Data in the Detail View

2017-07-03 16:23:07.762 Contacts[5166:1440970] *** Terminating app due to uncaught exception 'NSUnknownKeyException', re

am getting this error in my console

Nathan Noye
Nathan Noye
4,370 Points

Can you post your code so I can take a look at it? Thanks!

import UIKit

class AppDelegate: UIResponder, UIApplicationDelegate, UISplitViewControllerDelegate {  

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        let splitViewController = window!.rootViewController as! UISplitViewController
        let navigationController = splitViewController.viewControllers[splitViewController.viewControllers.count-1] as! UINavigationController
        navigationController.topViewController!.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem
        splitViewController.delegate = self
        return true

    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

    // MARK: - Split view

    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? ContactDetialController else { return false }
        if topAsDetailController.contact == nil {
            // Return true to indicate that we have handled the collapse by doing nothing; the secondary controller will be discarded.
            return true
   ,,,     return false


2 Answers

Ben Moore
Ben Moore
22,588 Points

Having the same issue.

Tom zion
Tom zion
5,907 Points

I had the same issue. The reason for that error is, when we created the UILabels on the ContactDetailController.swift we did not drag the correct label to the label itself. (I dragged the cell and did not pick any label) Go back and get rid of all the UILabels and there References and create them again making sure that you select the label on the right of the cell, drag it to your ContactDetailController view controller and run the app again.