Mixed use or not use of Arc in object-C Development

Code continues to improve, introducing the concept of Arc in xcode4. You can use or use it without it, so with this article: how to introduce a file that uses the arc feature in a project that does not use the arc, how to reference files that do not use arc in the ARC project. In fact, to put it bluntly, it is also very simple, that is, in the "compile
Add the corresponding files to sources or do not use the flag of Arc
OK, select the "compile sources" Location: select the project> targets> Target, select "build phases" on the right, and find "compile sources.

How to introduce a file that uses the arc feature in a project that does not use the arc feature: add the-fobjc-arc parameter to the file

How to reference files that do not use arc in the ARC Project: add the-fnoobjc-arc parameter to the corresponding file