[Solved] New MAC Unity Develop Error: error installing cocoapods

The new MAC system is 11.4, and the installed Xcode version is 13.2.1
after opening a unity project and switching to IOS platform, cocoapods is installed in the background, but an error is reported indicating that the installation fails:

ERROR: Error installing cocoapods:
       ERROR: Failed to build gem native extension.
   current directory: /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.5/ext/ffi_c/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /System/Library/Framewoks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0 -r ./siteconf20220311-4106-wxounc.rb extconf.rb
   mkmf.rb can't find header files for ruby at /System/Library/Framewoks/Ruby.framework/Versions/2.6/usr/lib/ruby/include/ruby.h

You might have to install separate package for the ruby development environment,ruby-dev or ruby-devel for example.

According to the error prompt and query from the network, it should be that a new Ruby Version needs to be installed, and the ruby provided by the system cannot be used
installing Ruby requires RVM, and installing RVM requires homebrew

Install homebrew

Use the command /usr/bin/Ruby - e" $(curl - fssl) is not used here https://raw.githubusercontent.com/Homebrew/install/master/install ）"

After installation, execute brew update update.

Then execute brew -vto see the installed version

Install RVM

Install RVM curl -L https://get.rvm.io | bash -s stable

reload RVM environment source ~/.rvm/scripts/rvm

View RVM version RVM -v

Install Ruby

Check the known version of ruby RVM list known

check the installed version of ruby RVM list

Install a ruby version. I chose 2.6.5 RVM install 2.6.5

After installation, check the Ruby Version Ruby -v. If it is not the version just downloaded, I need to use the command to cut the version

Install cocoapods

After the above installation, execute sudo gem install cocoapods -n/usr/local/bin to install cocoapods
after the installation, execute pod --version to view the version of cocoapods

Here, for unit packaging, cocoapods are not completely installed. You need to continue to follow the following steps.

Command + Shift + G, open to the folderpop-up window, and enter ~/.cocoapods, after opening the cocoapods folder, delete all the contents under it, create a new repos folder, open the command line tool, and execute the following three commands in turn

1) cd ~/.cocoapods/repos
2) git clone --depth 1 https://github.com/CocoaPods/Specs.git master
3) pod repo update

In this way, the Xcode project exported by unity will have Xcworkspace file (in case of problems in cocoapods environment, the exported Xcode project only has .xcodeproj file, and there are many exceptions when using this file for packaging press conference), and then open the file with Xcode for subsequent publishing

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