I wanted to add the AnyCodable to both my iOS project, and the test project that tests it.

When I added it to just my iOS project I got the error Undefined symbol: nominal type descriptor for AnyCodable.AnyCodable when trying to run tests.

My solution was to remove the framework, and then re-add it, this time specifying the test target as the target into which the framework should be added.

Once I did that, I was then able to go to my iOS project’s target, and in the General pane, scroll down to Frameworks, Libraries, and Embedded Content and add it there.