How to enable/disable ARC in an xcode project?

Question

If a project has already been created with ARC disabled, how do I enable it and vice versa?

Answer 1

Following are the steps which I did and it worked for me

1. Select Project
2. Select Targets
3. From the right panel, select Build Settings
4. Search for "Automatic Reference Counting";
5. Locate Apple LLVM compiler 3.0 - Language and Objective-C Automatic Reference Counting and select NO in all three sections.