How to know if my Xcode iPhone project is using ARC?
Select your project, then Build Settings. Look for Objective-C Automatic Reference Counting in the Apple LLVM Compiler - Language section. Make sure you select the target; while you can set this in the project, the target can override it.
(You can also use the search bar in Build Settings for OBJC_ARC.)
Keep in mind, too, that you can turn ARC on or off on a per file basis in build phases.
Or, just try something like this in code:
[[[NSObject alloc] init] autorelease]If you get an error:
ARC forbids explicit message send of 'autorelease'Then you're using ARC.
You can also require ARC from a source code file by checking for it:
#if !__has_feature(objc_arc)#error This file must be built with ARC.// You can turn on ARC for only this file by adding -fobjc-arc to the build phase.#endif