What is `copy to target` in Build Rules in Xcode?

Question

When I goto TARGETS - Build Rules - All in Xcode, I am seeing some files asking permission to copy to target.

What are those files?

Is it necessary to copy them to target?

What will happen after copying them to target?

I'm using xcode 4.6.

Answer 1

Build rules define what to do with the various files that have been added to the given target. Xcode includes a number of "built-in" rules for processing things like source files, image resources, etc. That's what you're seeing here.

You can hit the "Copy to Target" button to copy the rule from Xcode's read-only defaults into your target-defined rules so that you can modify it.