主细节应用程序初始视图控制器更改

Question

我是ios世界的新手，对主细节应用有疑问。 根视图是UISplitViewController。我有LoginViewController并希望使其成为根视图，然后在按钮后单击segue UISplitViewController

我尝试了但接收到错误＆＃34; Push segues只能在源控制器由UINavigationController实例管理时使用＆＃34;

AppDelegate.swift


import UIKit

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

}

LoginViewController

import UIKit

class LoginViewController: UIViewController {


    @IBOutlet weak var TryButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        TryButton.layer.cornerRadius = 10
    }

    @IBAction func policiesButtonClick(_ sender: Any) {
        guard let url = URL(string: "https://google.com/#q=") else {
            return
        }
        if #available(iOS 10.0, *) {
            UIApplication.shared.open(url)
        } else {
            UIApplication.shared.openURL(url)
        }
    }

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


}

Answer 1

你应该在mainViewController之后添加一个UINavigationController，然后设置Root和导航的其余部分。由于SplitViewController不是NavigationController，他不能制作Push和Pop。

Answer 2

您应该将根视图更改为 UINavigationController 。错误显然是一样的。

  

“Push segues只能在管理源控制器时使用   UINavigationController的一个实例“

SplitViewController 到NavigationControllers，segue是不同的。它应该嵌入segue而不是推送或 pop 。推送和弹出segue仅与导航控制器

相关联

Answer 3

尝试使用导航控制器嵌入控制器，如下所示：

选择导航控制器