ios - When to check "Copy items if needed" for embedded binaries?

Question

When I tried to put a third-party framework(installed by carthage) in the embedded binaries, I got such an option. I got confused, since "Embedded binaries are binary files that are copied to your application bundle when you build the project", It is already a copy instead of a link, why do I want a copy of a copy?

Answer 1

"Copy items if needed" has nothing to do with the building of your app. It means copied into the project folder, right now (if it isn't in the project folder already). I suggest you always say yes, because otherwise your project might end up depending upon stuff that isn't in the project folder, and which you might therefore throw away or rename by accident, thus causing your project to break.