2022-06-06 NoMethodError - undef

NoMethodError - undefined method `downcase' for nil:NilClass

Error

NoMethodError - undefined method `downcase' for nil:NilClass
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object/group.rb:445:in `block in sort'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object_list.rb:182:in `sort!'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object_list.rb:182:in `sort!'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object/group.rb:431:in `sort'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:183:in `sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:180:in `block (2 levels) in sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:180:in `each'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:180:in `block in sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:178:in `each'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:178:in `sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:180:in `block (2 levels) in sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:180:in `each'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:180:in `block in sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:178:in `each'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:178:in `sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:175:in `block in sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:173:in `each'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project/object.rb:173:in `sort_recursively'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/xcodeproj-1.21.0/lib/xcodeproj/project.rb:811:in `sort'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer/xcode/pods_project_generator/pods_project_writer.rb:81:in `block in save_projects'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer/xcode/pods_project_generator/pods_project_writer.rb:80:in `each'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer/xcode/pods_project_generator/pods_project_writer.rb:80:in `save_projects'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer/xcode/pods_project_generator/pods_project_writer.rb:63:in `write!'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer.rb:330:in `block in create_and_save_projects'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/user_interface.rb:64:in `section'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer.rb:309:in `create_and_save_projects'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer.rb:301:in `generate_pods_project'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer.rb:180:in `integrate'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/installer.rb:167:in `install!'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/command/install.rb:52:in `run'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/lib/cocoapods/command.rb:52:in `run'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/gems/cocoapods-1.11.2/bin/pod:55:in `<top (required)>'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/bin/pod:23:in `load'
/opt/homebrew/Cellar/cocoapods/1.11.2_1/libexec/bin/pod:23:in `<main>'

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[!] Oh no, an error occurred.

解决方法：

  s.source_files = 'WIMUIKit/**/*.{h,m,mm}','frameworks/wvr_lib/include/*.{h}'
    s.public_header_files = 'WIMUIKit/**/*.{h}','frameworks/wvr_lib/include/*.{h}'

改成

 
 s.source_files = 'WIMUIKit/**/*.{h,m,mm}' 
   s.public_header_files = 'WIMUIKit/**/*.{h}','frameworks/wvr_lib/include/*.{h}'

分析原因：
public_header_files、 source_files 互相包含了
在public_header_files出现了的.a的inclue的头文件，需要在source_files中同时出现的去掉

但是过了一段时间：

写成了下面方式：

  s.source_files = 'WIMUIKit/**/**/*.{h,m,mm}'
 
  s.public_header_files = 'WIMUIKit/**/*.{h}', 'WIMUIKit/frameworks/wvr_lib/include/*.{h}'
  s.vendored_libraries = 'WIMUIKit/frameworks/wvr_lib/*.{a}'

又报了这个错误了

那么我尝试把frameworks 改一个其他名字：
改成sframeworks

改成

  s.source_files = 'WIMUIKit/**/**/*.{h,m,mm}'
 
  s.public_header_files = 'WIMUIKit/**/*.{h}', 'WIMUIKit/sframeworks/wvr_lib/include/*.{h}'
  s.vendored_libraries = 'WIMUIKit/sframeworks/wvr_lib/*.{a}'

意外发现可以了

那么，我大胆的下结论：

这个文件名Frameworks 是特定的。 自己在设置cocopods podspec目录时候，避免用这个名字命名文件夹，存放代码和资源文件。