Flutter IOS build成功，archive失败

1.open ios/Runner.xcodeproj

2.I checked Runner/Pods is empty in Xcode sidebar.

3.drop Pods/Pods.xcodeproj into Runner/Pods.（在xcode中，从finder拖过去）

4."Valid architectures" to only "arm64" (I removed armv7 armv7s) (在targets->build setting，搜索下)