问题：
一旦我们终止了申请，我将面临未收到FCM通知的怪异问题。我不确定出了什么问题。作为统一的FCM SDK，将自动初始化并在FCM门户/数据库中注册令牌。每次启动游戏时，我们都会收到FCM令牌，并将其更新到我们自己的服务器上，以便稍后使用它发送Push通知。
我们已尝试解决的问题。
我们已经尝试了基本的故障排除方法，例如更改Unity插件版本（我们已经尝试过FCM Unity SDK v5.5.0和v5.6.0），使用具有不同OS版本的不同ios设备。
我们还尝试从unity3D构建集中“开发构建”选项（选中和未选中）。
重新启动应用程序后，我们不会在屏幕或日志控制台上收到任何与FCM相关的错误或警告。
在这里，我还从XCode日志控制台输入日志（一些行与其他代码和功能有关，因此已删除。
objc[2851]: Class CTBundle is implemented in both /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony (0x21715a250) and /var/containers/Bundle/Application/5A10884A-144F-4E13-9410-38884935EBA0/the100k.app/the100k (0x107743ad0). One of the two will be used. Which one is undefined.
2019-04-04 12:22:53.273087+0530 theApp[2851:791775] [DYMTLInitPlatform] platform initialization successful
2019-04-04 12:22:53.326547+0530 theApp[2851:791628] FCM: Loading UIApplication FIRFCM category
2019-04-04 12:22:53.327074+0530 theApp[2851:791786] - <AppMeasurement>[I-ACS036002] Analytics screen reporting is enabled. Call +[FIRAnalytics setScreenName:setScreenClass:] to set the screen name or override the default screen class name. To disable screen reporting, set the flag FirebaseScreenReportingEnabled to NO (boolean) in the Info.plist
2019-04-04 12:22:53.439337+0530 theApp[2851:791628] Built from '2018.3/staging' branch, Version '2018.3.8f1 (fc0fe30d6d91)', Build type 'Development', Scripting Backend 'il2cpp'
2019-04-04 12:22:53.445243+0530 theApp[2851:791628] -> registered mono modules 0x107049330
2019-04-04 12:22:53.591994+0530 theApp[2851:791628] You've implemented -[<UIApplicationDelegate> application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist.
2019-04-04 12:22:53.592369+0530 theApp[2851:791628] Setting up iOS 10 message delegate.
-> applicationDidFinishLaunching()
PlayerConnection initialized from /var/containers/Bundle/Application/5A10884A-144F-4E13-9410-38884935EBA0/the100k.app/Data (debug = 0)
PlayerConnection initialized network socket : 0.0.0.0 55000
Multi-casting "[IP] 10.2.11.120 [Port] 55000 [Flags] 2 [Guid] 2502646412 [EditorId] 905987573 [Version] 1048832 [Id] iPhonePlayer(INIC-A006):56000 [Debug] 0 [PackageName] iPhonePlayer" to [225.0.0.222:54997]...
Started listening to [0.0.0.0:55000]
PlayerConnection already initialized - listening to [0.0.0.0:55000]
2019-04-04 12:22:53.663072+0530 theApp[2851:791628] Metal GPU Frame Capture Enabled
2019-04-04 12:22:53.664986+0530 theApp[2851:791628] Metal API Validation Disabled
2019-04-04 12:22:53.776618+0530 theApp[2851:791628] [Warning] Trying to set delaysTouchesBegan to NO on a system gate gesture recognizer - this is unsupported and will have undesired side effects
-> applicationDidBecomeActive()
GfxDevice: creating device client; threaded=1
Initializing Metal device caps: Apple A9 GPU
Initialize engine version: 2018.3.8f1 (fc0fe30d6d91)
UnloadTime: 0.610417 ms
2019-04-04 12:22:54.611049+0530 theApp[2851:791628] Identifier not mentions init with bundle id
2019-04-04 12:22:54.611380+0530 theApp[2851:791628] access group not mentions init no access group
2019-04-04 12:22:54.642489+0530 theApp[2851:791628] TransactionObserver added
2019-04-04 12:22:54.642879+0530 theApp[2851:791628] do we support downloads: YES
2019-04-04 12:22:54.643920+0530 theApp[2851:791628] will we defer store payments: NO
2019-04-04 12:22:54.649145+0530 theApp[2851:791628] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
2019-04-04 12:22:54.650242+0530 theApp[2851:791628] [MC] Reading from public effective user settings.
Using Facebook Unity SDK v7.15.1 with FBiOSSDK/4.39.1
Facebook.Unity.CompiledFacebookLoader:Start()
(Filename: ./Runtime/Export/Debug.bindings.h Line: 45)
Thread -> id: 16cca7000 -> priority: 1
Unloading 5 Unused Serialized files (Serialized files now loaded: 0)
2019-04-04 12:22:54.980645+0530 theApp[2851:791848] 5.18.0 - [Firebase/Messaging][I-FCM001000] FIRMessaging Remote Notifications proxy enabled, will swizzle remote notification receiver handlers. If you'd prefer to manually integrate Firebase Messaging, add "FirebaseAppDelegateProxyEnabled" to your Info.plist, and set it to NO. Follow the instructions at:
https://firebase.google.com/docs/cloud-messaging/ios/client#method_swizzling_in_firebase_messaging
to ensure proper integration.
2019-04-04 12:22:54.980687+0530 theApp[2851:791848] 5.18.0 - [Firebase/Analytics][I-ACS023007] Analytics v.50700000 started
2019-04-04 12:22:54.980703+0530 theApp[2851:791848] 5.18.0 - [Firebase/Analytics][I-ACS023008] To enable debug logging set the following application argument: -FIRAnalyticsDebugEnabled
2019-04-04 12:22:55.077739+0530 theApp[2851:791628] FCM: new registration token received.
FCM: new registration token received.
(Filename: ./Runtime/Export/Debug.bindings.h Line: 45)
2019-04-04 12:22:55.078802+0530 theApp[2851:791628] FCM: Retrieve registration token
FCM: Retrieve registration token
(Filename: ./Runtime/Export/Debug.bindings.h Line: 45)
2019-04-04 12:22:55.102140+0530 theApp[2851:791858] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C1.1:2][0x10de1fba0] get output frames failed, state 8196
2019-04-04 12:22:55.102256+0530 theApp[2851:791858] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C1.1:2][0x10de1fba0] get output frames failed, state 8196
2019-04-04 12:22:55.102484+0530 theApp[2851:791858] TIC Read Status [1:0x0]: 1:57
2019-04-04 12:22:55.102526+0530 theApp[2851:791858] TIC Read Status [1:0x0]: 1:57
2019-04-04 12:22:55.130392+0530 theApp[2851:791628] [NetworkInfo] Signal strength query returned error: Error Domain=NSPOSIXErrorDomain Code=13 "Permission denied", descriptor: <CTServiceDescriptor 0x280694c80, domain=1, instance=1>
2019-04-04 12:22:55.136398+0530 theApp[2851:791858] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C2.1:2][0x10df1a250] get output frames failed, state 8196
2019-04-04 12:22:55.136792+0530 theApp[2851:791858] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C2.1:2][0x10df1a250] get output frames failed, state 8196
2019-04-04 12:22:55.137102+0530 theApp[2851:791858] TIC Read Status [2:0x0]: 1:57
2019-04-04 12:22:55.137120+0530 theApp[2851:791858] TIC Read Status [2:0x0]: 1:57
2019-04-04 12:22:55.139681+0530 theApp[2851:791628] FCM: Initialize Firebase Messaging
FCM: Initialize Firebase Messaging
(Filename: ./Runtime/Export/Debug.bindings.h Line: 45)
2019-04-04 12:22:55.140171+0530 theApp[2851:791628] FCM: Using FCM senderID X76XX00XX22X
FCM: Using FCM senderID X76XX00XX22X
(Filename: ./Runtime/Export/Debug.bindings.h Line: 45)
2019-04-04 12:22:55.142519+0530 theApp[2851:791628] FCM: Retrieve registration token
FCM: Retrieve registration token
(Filename: ./Runtime/Export/Debug.bindings.h Line: 45)
2019-04-04 12:22:55.176769+0530 theApp[2851:791628] didRegisterForRemoteNotificationsWithDeviceToken: <ed5242cd 6711c0d2 04d8c1f4 97d9f4f8 414582b4 01eed9ad b256fe6f 38cf1076>
2019-04-04 12:22:55.209552+0530 theApp[2851:791628] didRegisterForRemoteNotificationsWithDeviceToken: <ed5242cd 6711c0d2 04d8c1f4 97d9f4f8 414582b4 01eed9ad b256fe6f 38cf1076>
2019-04-04 12:22:55.213322+0530 theApp[2851:791628] didRegisterForRemoteNotificationsWithDeviceToken: <ed5242cd 6711c0d2 04d8c1f4 97d9f4f8 414582b4 01eed9ad b256fe6f 38cf1076>
2019-04-04 12:22:55.216454+0530 theApp[2851:791628] didRegisterForRemoteNotificationsWithDeviceToken: <ed5242cd 6711c0d2 04d8c1f4 97d9f4f8 414582b4 01eed9ad b256fe6f 38cf1076>
System memory in use before: 34.8 MB.
System memory in use after: 35.1 MB.
Unloading 34 unused Assets to reduce memory usage. Loaded Objects now: 4406.
Total: 11.901000 ms (FindLiveObjects: 1.246375 ms CreateObjectMapping: 0.107042 ms MarkObjects: 8.864583 ms DeleteObjects: 1.682167 ms)
[12:22:55.234] l: Token "cUxPw6jbQtg:APA91bFSeCvXMDXxcltzIvk2Ulas1Dq7gNjBNhsxNqPj5ZJNsBcZuB55TNf_dcG0J3gDHUyILMD6nEne-hCnnUUHEh9mj1yMoBlYtg4r1ixdcO2Rm3yYGUE73WQ6-G6hUm4MHLN1TY9u" is received from Firebase
Firebase.AppUtil:PollCallbacks()
Firebase.Platform.FirebaseHandler:Update()
(Filename: ./Runtime/Export/Debug.bindings.h Line: 45)
Unloading 1 Unused Serialized files (Serialized files now loaded: 0)
System memory in use before: 34.7 MB.
System memory in use after: 35.0 MB.
Unloading 0 unused Assets to reduce memory usage. Loaded Objects now: 4406.
Total: 13.005333 ms (FindLiveObjects: 0.964000 ms CreateObjectMapping: 0.069500 ms MarkObjects: 11.943958 ms DeleteObjects: 0.026875 ms)
2019-04-04 12:22:55.332752+0530 theApp[2851:791762] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C3.1:2][0x117e2c100] get output frames failed, state 8196
2019-04-04 12:22:55.333074+0530 theApp[2851:791762] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C3.1:2][0x117e2c100] get output frames failed, state 8196
2019-04-04 12:22:55.333290+0530 theApp[2851:791762] TIC Read Status [3:0x0]: 1:57
2019-04-04 12:22:55.333308+0530 theApp[2851:791762] TIC Read Status [3:0x0]: 1:57
2019-04-04 12:22:55.542556+0530 theApp[2851:791762] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C6.1:2][0x1175b48e0] get output frames failed, state 8196
2019-04-04 12:22:55.542677+0530 theApp[2851:791762] [BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C6.1:2][0x1175b48e0] get output frames failed, state 8196
2019-04-04 12:22:55.542895+0530 theApp[2851:791762] TIC Read Status [6:0x0]: 1:57
2019-04-04 12:22:55.542910+0530 theApp[2851:791762] TIC Read Status [6:0x0]: 1:57
2019-04-04 12:22:55.977707+0530 theApp[2851:791762] TIC TCP Conn Failed [8:0x283321e00]: 12:8 Err(-65554)
2019-04-04 12:22:55.979306+0530 theApp[2851:791858] Task <77C87314-C722-4E0F-95CA-77CFA8EEE5DE>.<2> HTTP load failed (error code: -1003 [12:8])
2019-04-04 12:22:55.979504+0530 theApp[2851:791858] Task <77C87314-C722-4E0F-95CA-77CFA8EEE5DE>.<2> finished with error - code: -1003
Unloading 0 Unused Serialized files (Serialized files now loaded: 0)
System memory in use before: 34.7 MB.
System memory in use after: 35.0 MB.
Unloading 0 unused Assets to reduce memory usage. Loaded Objects now: 4408.
Total: 10.983458 ms (FindLiveObjects: 0.875458 ms CreateObjectMapping: 0.081792 ms MarkObjects: 10.004875 ms DeleteObjects: 0.020167 ms)
当前结果：
重新启动应用程序后，不会将推送通知接收到设备。
但是，当执行PHP服务器代码以向设备发送推送通知时，FCM API将返回失败并显示消息
{
"multicast_id": X7XXX02XXX217XXX0X,
"success": 0,
"failure": 1,
"canonical_ids": 0,
"results": [{
"error": "NotRegistered"
}]
}
预期结果： 即使应用程序被杀死（无论是在后台模式还是在前台），它都应始终发送推送通知。