pod install error: miss ffi （M1芯片的Mac电脑上）

想直接看解决方案，可以翻到最后 

首先安装cocoapods

sudo gem install cocoapods -v 1.9.3

在M1芯片的Mac电脑上，执行完上述命令后，在使用pod命令时（比如pod install），会报ffi相关的错误，如下： 

missing compatible arch in /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.3/lib/ffi_c.bundle - /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.3/lib/ffi_c.bundle (LoadError)

Traceback如下：

    23: from /usr/local/bin/pod:23:in `<main>'
	22: from /usr/local/bin/pod:23:in `load'
	21: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:36:in `<top (required)>'
	20: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	19: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	18: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods.rb:17:in `<top (required)>'
	17: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods.rb:75:in `<module:Pod>'
	16: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	15: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	14: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/core_overrides.rb:1:in `<top (required)>'
	13: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	12: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	11: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/sources_manager.rb:5:in `<top (required)>'
	10: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 9: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 8: from /Library/Ruby/Gems/2.6.0/gems/typhoeus-1.4.0/lib/typhoeus.rb:2:in `<top (required)>'
	 7: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 6: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 5: from /Library/Ruby/Gems/2.6.0/gems/ethon-0.14.0/lib/ethon.rb:3:in `<top (required)>'
	 4: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 3: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 2: from /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.3/lib/ffi.rb:3:in `<top (required)>'
	 1: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- 2.6/ffi_c (LoadError)
	24: from /usr/local/bin/pod:23:in `<main>'
	23: from /usr/local/bin/pod:23:in `load'
	22: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:36:in `<top (required)>'
	21: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	20: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	19: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods.rb:17:in `<top (required)>'
	18: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods.rb:75:in `<module:Pod>'
	17: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	16: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	15: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/core_overrides.rb:1:in `<top (required)>'
	14: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	13: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	12: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/sources_manager.rb:5:in `<top (required)>'
	11: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	10: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 9: from /Library/Ruby/Gems/2.6.0/gems/typhoeus-1.4.0/lib/typhoeus.rb:2:in `<top (required)>'
	 8: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 7: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 6: from /Library/Ruby/Gems/2.6.0/gems/ethon-0.14.0/lib/ethon.rb:3:in `<top (required)>'
	 5: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 4: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 3: from /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.3/lib/ffi.rb:2:in `<top (required)>'
	 2: from /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.3/lib/ffi.rb:5:in `rescue in <top (required)>'
	 1: from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/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-1.15.3/lib/ffi_c.bundle, 0x0009): missing compatible arch in /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.3/lib/ffi_c.bundle - /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.3/lib/ffi_c.bundle (LoadError)

解决方案：

sudo arch -x86_64 gem install ffi
arch -x86_64 pod install
注：之后使用pod命令前，要加上"arch -x86_64"，表示以X86 模式运行该命令
如果嫌麻烦，可以执行下述命令：
arch -x86_64 $SHELL
就可以启动一个 X86 模式终端，使得之后运行的命令都在 X86 模式下运行。

 解决方案来源：https://github.com/CocoaPods/CocoaPods/issues/10220