ios - 升级我的 flutter 版本后无法构建 iOS 应用程序

Question

我是 Flutter iOS 开发的新手 我已经升级了我的 Flutter 版本，然后在我的应用程序无法构建 iOS 应用程序后我得到了我在下面提到的这个异常，请帮助我。在此之前它工作正常我应该重新安装 flutter 或任何其他想法意味着很多，提前致谢

Xcode build done.                                           10.7s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **
Xcode's output:
↳
    === BUILD TARGET map_view OF PROJECT Pods WITH CONFIGURATION Debug ===
    /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabase.m:1486:15: warning: 'sqlite3_wal_checkpoint_v2' is only available on iOS 5.0 or newer [-Wunguarded-availability]
        int err = sqlite3_wal_checkpoint_v2(_db, dbName, checkpointMode, logFrameCount, checkpointCount);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~
    In module 'SQLite3' imported from /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabase.m:8:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk/usr/include/sqlite3.h:8244:16: note: 'sqlite3_wal_checkpoint_v2' has been explicitly marked partial here
    SQLITE_API int sqlite3_wal_checkpoint_v2(
                   ^
    /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabase.m:1486:15: note: enclose 'sqlite3_wal_checkpoint_v2' in an @available check to silence this warning
        int err = sqlite3_wal_checkpoint_v2(_db, dbName, checkpointMode, logFrameCount, checkpointCount);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~
    1 warning generated.
    === BUILD TARGET map_view OF PROJECT Pods WITH CONFIGURATION Debug ===
    /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabaseQueue.m:101:9: warning: 'dispatch_queue_set_specific' is only available on iOS 5.0 or newer [-Wunguarded-availability]
            dispatch_queue_set_specific(_queue, kDispatchQueueSpecificKey, (__bridge void *)self, NULL);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
    In module 'Foundation' imported from /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabaseQueue.h:9:
    In module 'CoreFoundation' imported from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:6:
    In module 'Dispatch' imported from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFStream.h:20:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk/usr/include/dispatch/queue.h:1352:1: note: 'dispatch_queue_set_specific' has been explicitly marked partial here
    dispatch_queue_set_specific(dispatch_queue_t queue, const void *key,
    ^
    /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabaseQueue.m:101:9: note: enclose 'dispatch_queue_set_specific' in an @available check to silence this warning
            dispatch_queue_set_specific(_queue, kDispatchQueueSpecificKey, (__bridge void *)self, NULL);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
    /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabaseQueue.m:184:54: warning: 'dispatch_get_specific' is only available on iOS 5.0 or newer [-Wunguarded-availability]
        FMDatabaseQueue *currentSyncQueue = (__bridge id)dispatch_get_specific(kDispatchQueueSpecificKey);
                                                         ^~~~~~~~~~~~~~~~~~~~~
    In module 'Foundation' imported from /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabaseQueue.h:9:
    In module 'CoreFoundation' imported from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:6:
    In module 'Dispatch' imported from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFStream.h:20:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk/usr/include/dispatch/queue.h:1408:1: note: 'dispatch_get_specific' has been explicitly marked partial here
    dispatch_get_specific(const void *key);
    ^
    /Users/harshavardhan/Workspace/fleetconnect_flutter/ios/Pods/FMDB/src/fmdb/FMDatabaseQueue.m:184:54: note: enclose 'dispatch_get_specific' in an @available check to silence this warning
        FMDatabaseQueue *currentSyncQueue = (__bridge id)dispatch_get_specific(kDispatchQueueSpecificKey);
                                                         ^~~~~~~~~~~~~~~~~~~~~
    2 warnings generated.
    /Users/harshavardhan/development/flutter/.pub-cache/hosted/pub.dartlang.org/fluttertoast-2.2.11/ios/Classes/FluttertoastPlugin.m:19:23: warning: unused variable 'viewController' [-Wunused-variable]
        UIViewController *viewController =
                          ^
    /Users/harshavardhan/development/flutter/.pub-cache/hosted/pub.dartlang.org/fluttertoast-2.2.11/ios/Classes/FluttertoastPlugin.m:48:19: warning: unused variable 'size' [-Wunused-variable]
            NSNumber *size = call.arguments[@"size"];
                      ^
    2 warnings generated.
    === BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
    ld: framework not found Flutter
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
Could not build the application for the simulator.
Error launching application on iPhone XR.
Exited (sigterm)

Answer 1

尝试在终端中清理项目(Flutter clean)，从ios 目录运行pod install，然后再次运行应用程序.

如果这似乎不能解决问题，others通过按照您自己的建议重新安装 Flutter，他们很幸运地解决了这个问题。