最佳可用解决方案AppDelegate.swift：

import UIKit
import Flutter
import FirebaseAuth
import FirebaseMessaging

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [. 
UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
    if #available(iOS 10.0, *) {
        UNUserNotificationCenter.current().delegate = self
    }

    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: 
launchOptions)
}

// https://firebase.google.com/docs/auth/ios/phone-auth#appendix:-using-phone-sign-in-without-swizzling
// https://firebase.google.com/docs/cloud-messaging/ios/client#token-swizzle-disabled
override func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    // Pass device token to auth
    Auth.auth().setAPNSToken(deviceToken, type: .unknown)

    // Pass device token to messaging
    Messaging.messaging().apnsToken = deviceToken

    return super.application(application, didRegisterForRemoteNotificationsWithDeviceToken: deviceToken)
}

// https://firebase.google.com/docs/auth/ios/phone-auth#appendix:-using-phone-sign-in-without-swizzling
// https://firebase.google.com/docs/cloud-messaging/ios/receive#handle-swizzle
override func application(_ application: UIApplication,
                          didReceiveRemoteNotification notification: [AnyHashable : Any],
                          fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    // Handle the message for firebase auth phone verification
    if Auth.auth().canHandleNotification(notification) {
        completionHandler(.noData)
        return
    }

    // Handle it for firebase messaging analytics
    if ((notification["gcm.message_id"]) != nil) {
        Messaging.messaging().appDidReceiveMessage(notification)
    }

    return super.application(application, didReceiveRemoteNotification: notification, fetchCompletionHandler: completionHandler)
}

// https://firebase.google.com/docs/auth/ios/phone-auth#appendix:-using-phone-sign-in-without-swizzling
override func application(_ application: UIApplication, open url: URL,
                          options: [UIApplication.OpenURLOptionsKey : Any]) -> Bool {
    // Handle auth reCAPTCHA when silent push notifications aren't available
    if Auth.auth().canHandle(url) {
        return true
    }

    return super.application(application, open: url, options: options)
   }
}

• • 解决方案：**

我发现这在flutter仓库和目前的作品。
将当前的firebase_auth版本替换为

firebase_auth:
    git:
      url: https://github.com/collinjackson/plugins.git
      ref: 441417c2fed0ff26bf84a49ab2c5ffd2aa5487de
      path: packages/firebase_auth

由于我在flutter项目中使用firebase消息传递和电话身份验证，我也面临着同样的问题，FCM通知支持图像。在ImageNotification项目中

// NotificationService.h

#import <UIKit/UIKit.h>

还有

// NotificationService.m
    
- (BOOL)application:(UIApplication *)app
            openURL:(NSURL *)url
            options:(NSDictionary<UIApplicationOpenURLOptionsKey, id> *)options {
  if ([[FIRAuth auth] canHandleURL:url]) {
    return YES;
  }
  // URL not auth related; it should be handled separately.
    return NO;
}

- (void)scene:(UIScene *)scene openURLContexts:(NSSet<UIOpenURLContext *> *)URLContexts {
  for (UIOpenURLContext *urlContext in URLContexts) {
    [FIRAuth.auth canHandleURL:urlContext.URL];
    // URL not auth related; it should be handled separately.
  }
}

这对我很有效谢谢。