问题描述
在安装 pod update Firebase/Firestore 软件包后，在 iOS 模拟器上运行时，我什至尝试过 cloud_firestore 仍然出现以下错误。
即使我已经多次尝试删除 Podfile.lock 和 Flutter clean 然后 Flutter run。
注意：
-
Dart 2.12.1
未能构建 iOS 应用程序 Xcode 构建的错误输出： ↳ ** 构建失败 **
Xcode's output: ↳ In file included from /Users/gwl/firebase_demo/ios/Pods/abseil/absl/base/internal/thread_identity.cc:26: In file included from /Users/gwl/firebase_demo/ios/Pods/abseil/absl/base/call_once.h:34: /Users/gwl/firebase_demo/ios/Pods/abseil/absl/base/internal/invoke.h:42:10: Fatal error: 'absl/Meta/type_traits.h' file not found #include "absl/Meta/type_traits.h" ^~~~~~~~~~~~~~~~~~~~~~~~~ /Users/gwl/firebase_demo/ios/Pods/abseil/absl/base/internal/invoke.h:42:10: note: did not find header 'Meta/type_traits.h' in framework 'absl' (loaded from '/Users/gwl/firebase_demo/build/ios/Debug-iphonesimulator/abseil') 1 error generated. note: Using new build system note: Building targets in parallel note: Planning build note: Constructing build description Could not build the application for the simulator. Error launching application on iPhone 11.
解决方法
你需要删除podfile.lock
然后你需要从 XCode 运行 iOS 文件夹来为你的项目加载资产
转到ios文件夹并执行pod install，如果它不存在则执行pod init然后pod install
请尝试 Xcode -> Product -> Run
,首先删除 podfile.lock 并按照以下步骤操作；
flutter clean
flutter pub get
cd ios
pod install
flutter run
如果不起作用，请检查您的颤振频道并将其更改为测试版。
flutter pub upgrade
flutter channel beta
flutter clean
cd ios
pod install
flutter run
您也可以在下面切换回稳定输入；
flutter channel beta
这解决了我的问题GitHub issue
尝试在您的 ios 目录中运行这些命令：
rm -rf Pods
rm -rf Podfile.lock
rm -rf ~/.pub-cache/hosted/pub.dartlang.org/
pod cache clean --all
flutter clean
flutter pub get
pod repo update
pod install