如何解决 swift iOS 的 libc++abi.dylib 错误

Question

由于某种原因，每当我在applicationDidFinishLaunch方法中运行FirebaseApp.configure((时，我都会收到错误。但是当我在初始化中运行FirebaseApp.configure((时，它工作得很好。为什么？我得到的错误是

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

我想在我的applicaitonDidFinishLaunch方法中运行FirebaseApp.configure((的原因是因为我正在尝试设置Firebase云消息传递。它目前不起作用，但是在从头开始创建一个新的演示应用程序后，我意识到的是，如果FirebaseApp.configure((在applicationDidFinishLaunch方法中，它可以正常工作，但是如果我将其放在init方法中则不起作用。

如果我从不调用FirebaseApp.configure((，我也会收到同样的错误。

这是我的 podfile

    # Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'
target 'ArcadeCity' do
  use_frameworks!
  # Pods for ArcadeCity
  pod 'Firebase/Core'
  pod 'Firebase/Database'
  pod 'Firebase/Storage'
  pod 'Firebase/Messaging'
  pod 'FBSDKCoreKit'
  pod 'FBSDKShareKit'
  pod 'FBSDKLoginKit'
  pod 'Firebase/Auth'
  pod 'GoogleMaps', '= 2.3.0'
end

这是我的应用程序代表

import UIKit
import CoreData
import Firebase
import FirebaseInstanceID
import FirebaseMessaging
import UserNotifications
import FBSDKCoreKit
import GoogleMaps
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, MessagingDelegate {
var window: UIWindow?
override init() {
    super.init()
    //FirebaseApp.configure()
}
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
    GMSServices.provideAPIKey("AIzaSyAJxvbSc0wd1jJYCpqEC0iAB4PPlMu03UE")
    UITabBar.appearance().tintColor = UIColor(red:0.02, green:0.44, blue:0.75, alpha:1.0)
    if #available(iOS 10.0, *) {
        // For iOS 10 display notification (sent via APNS)
        UNUserNotificationCenter.current().delegate = self
        Messaging.messaging().delegate = self
        let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
        UNUserNotificationCenter.current().requestAuthorization(
            options: authOptions,
            completionHandler: {_, _ in })
    } else {
        let settings: UIUserNotificationSettings =
            UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
        application.registerUserNotificationSettings(settings)
    }
    application.registerForRemoteNotifications()
    FirebaseApp.configure()
    let token = Messaging.messaging().fcmToken
    print("FCM token: (token ?? "")nend")
    return true
}
func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
    print("Firebase registration token: (fcmToken)")
}
// Called when APNs has assigned the device a unique token
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    Messaging.messaging().apnsToken = deviceToken
    let deviceTokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})
    print("APNs device token: (deviceTokenString)")
    Messaging.messaging().subscribe(toTopic: "newRideRequests")
}
// Called when APNs failed to register the device for push notifications
func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
    // Print the error to console (you should alert the user that registration failed)
    print("APNs registration failed: (error)")
}
func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
    print(remoteMessage.appData)
}
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    print(userInfo)
}
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:.
    // Saves changes in the application's managed object context before the application terminates.
    self.saveContext()
}
// MARK: - Core Data stack
lazy var persistentContainer: NSPersistentContainer = {
    /*
     The persistent container for the application. This implementation
     creates and returns a container, having loaded the store for the
     application to it. This property is optional since there are legitimate
     error conditions that could cause the creation of the store to fail.
    */
    let container = NSPersistentContainer(name: "ArcadeCity")
    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error as NSError? {
            // Replace this implementation with code to handle the error appropriately.
            // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            /*
             Typical reasons for an error here include:
             * The parent directory does not exist, cannot be created, or disallows writing.
             * The persistent store is not accessible, due to permissions or data protection when the device is locked.
             * The device is out of space.
             * The store could not be migrated to the current model version.
             Check the error message to determine what the actual problem was.
             */
            fatalError("Unresolved error (error), (error.userInfo)")
        }
    })
    return container
}()
// MARK: - Core Data Saving support
func saveContext () {
    let context = persistentContainer.viewContext
    if context.hasChanges {
        do {
            try context.save()
        } catch {
            // Replace this implementation with code to handle the error appropriately.
            // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
            let nserror = error as NSError
            fatalError("Unresolved error (nserror), (nserror.userInfo)")
        }
    }
}
}

Answer 1

确保您不会无意中多次调用FirebaseApp.configure()，因为调用它超过该值会导致异常。

Answer 2

我发现了错误。这是因为我不了解应用程序生命周期。在我的应用的其他地方，我引用了Firebase数据库。事实证明，代码在我的"applicationDidFinishLaunching"之前运行。在这里，我认为"didFinishLaunching"方法是用于低级的东西，它会在我自己的任何个人代码运行之前运行。根本不是这样。