Automatic Reference Counting (ARC) is a compiler feature that provides automatic memory management of Objective-C objects. Rather than having to think about retain and release operations, ARC allows you to concentrate on the interesting code, the object graphs, and the relationships between objects in your application.
When you want to use objects whose life time is not set and are not willing to use ARC. then you’ll end up with an issue raised by Xcode IDE;
1. Double click on your project,
2. Click on “Build Phases” at the top menu,
3. Expand “Compile Sources”,
4. Double click on the file(s) that you want to disable ARC and add the below flags and close
you’ll notice the issue is gone once you close the pop up screens in order for saving the changes.