在将firebase_database: ^7.0.0-dev.2添加到我的项目后，我一直遇到这个问题。我还研究了GitHub、S/O和Flutter repo上的其他问题，但没有成功。
我尝试过的一些故障排除尝试包括：
- 删除
pod文件、Podfile、Podfile.lock等 - 运行
flutter clean和flutter pub get - 运行
pod install
我创建了一个新的flutter项目，并将firebase_core: ^1.1.0和firebase_database: ^7.0.0-dev.2添加到pubspec.yaml中。因此，我知道这个问题并不是因为与我的项目中的其他flutter包存在依赖冲突。
以下是我尝试在模拟器上运行调试日志时的输出：
Launching lib/main.dart on iPad Pro (12.9-inch) (2nd generation) in debug mode...
Running pod install... 1,832ms
Running Xcode build...
Xcode build done. 3.4s
Failed to build iOS app
Error output from Xcode build:
↳
objc[4399]: Class AMSupportURLConnectionDelegate is implemented in both ?? (0x1f1f7c188) and ?? (0x117eb02b8). One of the two will be used. Which one is undefined.
objc[4399]: Class AMSupportURLSession is implemented in both ?? (0x1f1f7c1d8) and ?? (0x117eb0308). One of the two will be used. Which one is undefined.
** BUILD FAILED **
Xcode's output:
↳
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Realtime/FWebSocketConnection.m:22:9: fatal error:
'FirebaseCore/Sources/Private/FirebaseCoreInternal.h' file not found
#import "FirebaseCore/Sources/Private/FirebaseCoreInternal.h"
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Realtime/FWebSocketConnection.m:22:9: note: did not find header
'Sources/Private/FirebaseCoreInternal.h' in framework 'FirebaseCore' (loaded from '/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/build/ios/Debug-iphonesimulator/FirebaseCore')
1 error generated.
In file included from /Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Core/View/FView.m:18:
In file included from /Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Api/Private/FIRDatabaseQuery_Private.h:19:
In file included from /Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Core/FRepo.h:17:
In file included from /Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Core/FPersistentConnection.h:19:
In file included from /Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Realtime/FConnection.h:17:
In file included from /Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Realtime/FWebSocketConnection.h:17:
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Utilities/FUtilities.h:17:9: fatal error: 'FirebaseCore/Sources/Private/FirebaseCoreInternal.h'
file not found
#import "FirebaseCore/Sources/Private/FirebaseCoreInternal.h"
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Utilities/FUtilities.h:17:9: note: did not find header 'Sources/Private/FirebaseCoreInternal.h'
in framework 'FirebaseCore' (loaded from '/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/build/ios/Debug-iphonesimulator/FirebaseCore')
1 error generated.
In file included from /Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/FValueIndex.m:21:
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Utilities/FUtilities.h:17:9: fatal error: 'FirebaseCore/Sources/Private/FirebaseCoreInternal.h'
file not found
#import "FirebaseCore/Sources/Private/FirebaseCoreInternal.h"
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Utilities/FUtilities.h:17:9: note: did not find header 'Sources/Private/FirebaseCoreInternal.h'
in framework 'FirebaseCore' (loaded from '/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/build/ios/Debug-iphonesimulator/FirebaseCore')
1 error generated.
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Core/View/FValueEventRegistration.m:18:9: fatal error:
'FirebaseCore/Sources/Private/FirebaseCoreInternal.h' file not found
#import "FirebaseCore/Sources/Private/FirebaseCoreInternal.h"
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/FirebaseDatabase/FirebaseDatabase/Sources/Core/View/FValueEventRegistration.m:18:9: note: did not find header
'Sources/Private/FirebaseCoreInternal.h' in framework 'FirebaseCore' (loaded from '/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/build/ios/Debug-iphonesimulator/FirebaseCore')
1 error generated.
note: Using new build system
note: Building targets in parallel
note: Planning build
note: Analyzing workspace
note: Constructing build description
note: Build preparation complete
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported
deployment target versions is 9.0 to 14.5.99. (in target 'leveldb-library' from project 'Pods')
/Users/hetpatel/Documents/MobileApps/FlutterProjects/flutter_application_1/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported
deployment target versions is 9.0 to 14.5.99. (in target 'Flutter' from project 'Pods')
Could not build the application for the simulator.
Error launching application on iPad Pro (12.9-inch) (2nd generation).
现在找到了一个解决方法：
将firebase_core降至"0.7.0"版本，将firebase_database降至^6.0.0