关于swift：当我编写FirebaseApp.configure()时，iOS应用程序崩溃

iOS app crashes when I write FirebaseApp.configure()

我有一个ios应用程序，可以正常登录和使用Facebook登录。今天，我集成了firebase，当我在应用程序委托中编写FirebaseApp.configure()时，我的应用程序崩溃了，该函数突出显示，错误代码为"意外发现为零，同时展开了一个可选值"：

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func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any]) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(app, open: url, sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String, annotation: options[UIApplicationOpenURLOptionsKey.annotation])

}

AppDelegate类的代码为：

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//
// AppDelegate.swift
//
//
// Created by Macbook on 01/01/2018.
// Copyright ? 2018 Macbo0k. All rights reserved.
//

import UIKit
import IQKeyboardManagerSwift
import FBSDKCoreKit
import FBSDKLoginKit
import Firebase
import UserNotifications
import FirebaseInstanceID
import FirebaseMessaging

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
let usd = UserDefaults.standard

if usd.object(forKey:"loginstatus") != nil && (usd.value(forKey:"loginstatus") != nil) {
if usd.value(forKey:"loginstatus") as! Bool != false{
self.window = UIWindow(frame: UIScreen.main.bounds)

let storyboard = UIStoryboard(name:"Main", bundle: nil)

let initialViewController = storyboard.instantiateViewController(withIdentifier:"tabbarvc")

self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
}

}
FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)

let newFont = UIFont(name:"BebasNeueLight", size: 20.0)!
let color = UIColor(red: 255,green:204, blue:102)

UINavigationBar.appearance().titleTextAttributes = [NSAttributedStringKey.foregroundColor: color,
NSAttributedStringKey.font: UIFont(name:"BebasNeueRegular", size: 20)!
]

UIBarButtonItem.appearance(whenContainedInInstancesOf: [UINavigationBar.classForCoder() as! UIAppearanceContainer.Type]).setTitleTextAttributes([NSAttributedStringKey.foregroundColor: color, NSAttributedStringKey.font: newFont], for: .normal)
UIBarButtonItem.appearance(whenContainedInInstancesOf: [UINavigationBar.classForCoder() as! UIAppearanceContainer.Type]).setTitleTextAttributes([NSAttributedStringKey.foregroundColor: color, NSAttributedStringKey.font: newFont], for: .highlighted)

//print("fonts are: \\(UIFont.familyNames)")
IQKeyboardManager.sharedManager().enable = true

FirebaseApp.configure()
return true
}

func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool {

let isFacebookURL = url.scheme != nil && url.scheme!.hasPrefix("fb\\(FBSDKSettings.appID())") && url.host =="authorize"
if isFacebookURL {
return FBSDKApplicationDelegate.sharedInstance().application(application, open: url as URL!, sourceApplication: sourceApplication, annotation: annotation)
}
return false
}

func applicationWillResignActive(_ application: UIApplication) {

}

func applicationDidEnterBackground(_ application: UIApplication) {
print("app is in background mode")
}

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.
FBSDKAppEvents.activateApp()

}

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any]) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(app, open: url, sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String, annotation: options[UIApplicationOpenURLOptionsKey.annotation])

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

}

，日志为：

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2018-02-13 14:50:30.070051+0500 Sneakersapp[11075:119374] [MC] Reading from private effective user settings.
2018-02-13 14:50:30.113172+0500 Sneakersapp[11075:119374] Could not successfully update network info during initialization.
2018-02-13 14:50:30.824700+0500 Sneakersapp[11075:119470] TIC TCP Conn Failed [6:0x600000169480]: 12:8 Err(-65554)
2018-02-13 14:50:30.827309+0500 Sneakersapp[11075:119444] Task <D3E060F1-6F56-451A-B00C-CD3CFF86CD8F>.<2> HTTP load failed (error code: -1003 [12:8])
2018-02-13 14:50:30.827738+0500 Sneakersapp[11075:119444] Task <D3E060F1-6F56-451A-B00C-CD3CFF86CD8F>.<2> finished with error - code: -1003
2018-02-13 14:50:31.064485+0500 Sneakersapp[11075:119470] TIC Read Status [3:0x0]: 1:57
2018-02-13 14:50:31.064751+0500 Sneakersapp[11075:119470] TIC Read Status [3:0x0]: 1:57
2018-02-13 14:50:31.198410+0500 Sneakersapp[11075:119444] TIC Read Status [1:0x0]: 1:57
2018-02-13 14:50:31.199036+0500 Sneakersapp[11075:119444] TIC Read Status [1:0x0]: 1:57
2018-02-13 14:50:31.808151+0500 Sneakersapp[11075:119469] TIC Read Status [4:0x0]: 1:57
2018-02-13 14:50:31.808292+0500 Sneakersapp[11075:119469] TIC Read Status [4:0x0]: 1:57
(lldb)

一旦我从didfinishLaunchingWithOptions函数中注释了FirebaseApp.configure()，应用程序就可以正常工作。

请帮助。