首先呢，报错如下：
Error output from CocoaPods:
↳
[!] Automatically assigning platform `iOS` with version `9.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile. See `https://guides.cocoapods.org/syntax/podfile.html#platform`.
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': dlopen(/Library/Ruby/Gems/2.6.0/gems/ffi-1.15.4/lib/ffi_c.bundle, 9): no suitable image found. Did find: (LoadError)
/Library/Ruby/Gems/2.6.0/gems/ffi-1.15.4/lib/ffi_c.bundle: mach-o, but wrong architecture
/Library/Ruby/Gems/2.6.0/gems/ffi-1.15.4/lib/ffi_c.bundle: mach-o, but wrong architecture - /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.4/lib/ffi_c.bundle
……
Error running pod install
项目根目录中执行以下命令：
sudo gem install ffi
然后进入到Podfile文件所在目录（也就是项目下的ios目录），执行以下命令：
arch -x86_64 pod install or pod install
或者是
pod install
如果还是报错，并且是m1芯片，可以参考如下命令
1、先卸载Ruby
brew uninstall ruby --force
2、卸载可能已经安装但没成功安装的CocoaPods
sudo gem uninstall cocoapods
sudo gem uninstall cocoapods-core
sudo gem uninstall cocoapods-downloader
3、重新安装ffi和cocoapods
sudo arch -x86_64 gem install ffi
sudo arch -x86_64 gem install cocoapods
4、最后仍然在Podfile文件所在的目录（项目的ios目录），运行
arch -x86_64 pod install
此时已经安装成功，再次启动项目，“Running pod install...”这一步已经可以顺利通过了。
整理不易，如果有帮助谢谢点赞支持。
