Convert a static library target into a framework target in an Xcode project

To convert the static/dynamic linked framework from static linked library,

1. Add a new cocoa touch framework as a TARGET in your existing static linked library project.
2. In the Build Phases, adding all the .m, .mm, .c, .cpp, .metal, etc. into "\Build Phases\Compile Sources" phase of your static linked framework target.
3. Put the headers that you want to exposed in to "\Build Phases\Headers".
4. For dynamic linked framework, remember to check the Mach-O Type setting in your Build Settings. If you are going to use swift, you need to make sure the Mach-O type is set as dynamic library so that it will become a dynamic linked framework. For static linked framework, you'll need to set the Mach-O type as static library, but you cannot use swift in the converted static linked framework (only objective-c, objective-c++, C++, C, etc. are allowed).

Then for the app that wants to use this framework just need to include the headers as #import and add the framework into "Build Phases\Link Binary With Libraries" of your App Target. If the converted framework is dynamic linked framework, you will need to put it into "Embedded Binaries".

I saw that someone created the framework manually, creating a module.framework file and copying all the header files in a module.framework/Headers folder. This solution seems to work, the project can import correctly the files and see them as a framework correctly.

I'm not sure this is the best way to do it tough, I'm trying it on a big project that ATM is importing the static library through cocoapods, but it seems like I have some problem with the visibility of some of the classes using the framework.