How to add ARC for specific file?

Question

I created a project without ARC. I want to use a third party SDK in my project. That SDK comes with ARC Support. So I

Answer 1

Add the flag -fobjc-arc to the files that you'd like to use ARC. It's just the opposite of the other.

Answer 2

You add compiler flags in Targets -> Build Phases -> Compile Sources

Compile source show all file that project contain.so please add -fobjc-arc to compiler flag by double clicking on it as show in below image.