每次archive，或者flutter 升级 都有点问题，记录下
1. 'connectivity/ConnectivityPlugin.h' file not found
尝试以下：
(1).删除Podfile，Podfile.lock，Pods文件夹，Runner.xcworkspace，让flutter重新生成这几个文件，就好了
(2).I solved my problem by File-> Workspace Settings changing build system to New Build System
(3).open runner.xcworkspace ,it worked! 打开workspace而不是 runner.proj