AppDelegate didFinishLaunchingWithOptions launchOptions-以NSException Swift 3.0类型的未捕获异常终止

问题描述

我正在尝试使用Swift 3.0创建登录/受保护的页面会话页面

I'm trying to create login/protected page session page using Swift 3.0

因此，我在AppDelegate.swift中创建了如下的 didFinishLaunchingWithOptions launchOptions 函数

Therefore, I created didFinishLaunchingWithOptions launchOptions function in AppDelegate.swift as below

AppDelegate.swift

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

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


        let rootViewController = self.window!.rootViewController
        let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)

        let isUserLoggedIn:Bool = UserDefaults.standard.bool(forKey: "isUserLoggedIn")
        if(!isUserLoggedIn){

            let loginViewController = mainStoryBoard.instantiateViewController(withIdentifier: "loginview") as! LoginVC

            window!.rootViewController = loginViewController
            window!.makeKeyAndVisible()

        }
        else{
            let protectedPage = mainStoryBoard.instantiateViewController(withIdentifier: "ViewController") as! ViewController

            window!.rootViewController = protectedPage
            window!.makeKeyAndVisible()
        }

        return true
    }
}

它构建成功，但是运行应用程序时出现错误.错误如下

It build successfully, But i got an error when apps run. The error as below

libc ++ abi.dylib:以类型未捕获的异常终止 NSException(lldb)

libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

推荐答案

很可能您没有设置LoginVC的Storyboard ID.在情节提要中选择LoginVC，并将情节提要ID设置为"loginview".参见图片以供参考

Most probably, you did not set the Storyboard ID of your LoginVC. Select the LoginVC in storyboard and set the storyboard ID as "loginview". See the image for reference

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