1.flutter SDK链接
https://flutter.dev/docs/development/tools/sdk/releases?tab=macos
2.命令
flutter 相关命令
1.检查当前分支
flutter channel
2.切换分支
flutter channel beta
flutter channel master
3.升级flutter
flutter upgrade
3.升级后需匹配兼容的CocoaPods
1.命令
查看gem源是否是最新的：gem sources -l
查看 版本：gem -v
查看pods版本：pod --version
2.升级cocoapods：sudo gem install -n /usr/local/bin cocoapods —pre
会出现这个报错 “ERROR: While executing gem ... (URI::InvalidURIError)
URI must be ascii only "?gems=\u{2014}pre"”
解决方法：sudo gem install -n /usr/local/bin cocoapods 升级
4.版本回退
1.cd到flutter目录下
2.git reset --hard 7a4c33425ddd78c54aba07d86f3f9a4a0051769b（回退到哪个版本的提交记录号）
