关于cocoapods模块化开发的技术文档 https://casatwy.com/modulization_in_action.htmlhttps://guides.cocoapods.org/syntax/podspec.html#group_build_settings制作podspechttp://www.jianshu.com/p/ddc2490bff9f制作私有库 https://www.raywenderlich.com/65964/create-a-framework-for-ios iOS构建framework