I am using ARC successfully in my project. However, I have encountered a few files (e.g., in unit tests and mock objects) where the rules of ARC are a little more fragile right now. I recall hearing that there was a way to disable ARC on a per-file basis, though I have been unable to find this option.
Is this possible? How do I disable ARC on a per-file basis?
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Disable ARC on MULTIPLE files:
;)
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For Xcode 4.3 the easier way might be: Edit/Refactor/Convert to objective-C ARC, then check off the files you don't want to be converted. I find this way the same as using the compiler flag above.
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Note: if you want to disable ARC for many files, you have to:
-fno-objc-arc
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It is very simple way to make individual file non-arc.
Follow below steps :
Disable ARC on individual file:
Select desired files at Target/Build Phases/Compile Sources in Xcode
Select .m file which you want make it NON-ARC PRESS ENTER Type -fno-objc-arc
Non ARC file to ARC project flag : -fno-objc-arc
ARC file to non ARC project flag : -fobjc-arc
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Add flag “-fno-objc-arc”.
Simple follow steps : App>Targets>Build Phases>Compile Sources> add flag after class “-fno-objc-arc”
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The four Mandatory Step as explained in this video
//1. Select desired files
//2. Target/Build Phases/Compile Sources
//3. Type -fno-objc-arc
//4. Done
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It is possible to disable ARC (Automatic Reference Counting) for particular file in Xcode.
Select Target -> Build Phases -> Compile Sources -> Select File (double click) -> Add "-fno-objc-arc" to pop-up window.
I had encountered this situation in using "Reachibility" files.
This is shown in below figure :
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Just use the -fno-objc-arc flag in Build Phases>Compile Sources infront of files to whom you dont want ARC to be apply.
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GO to App -> then Targets -> Build Phases -> Compile Source
Now, Select the file in which you want to disable ARC
paste this snippet "-fno-objc-arc" After pasting press ENTER
in each file where you want to disable ARC.
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Following Step to to enable disable ARC
Select Xcode project Go to targets Select the Build phases section Inside the build phases section select the compile sources. Select the file which you do not want to disable ARC and add -fno-objc-arc
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If you're using Unity, you don't need to change this in Xcode, you can apply a compile flag in the metadata for the specific file(s), right inside Unity. Just select them in the Project panel, and apply from the Inspector panel. This is essential if you plan on using Cloud Build.
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I think all the other answers are explaining how to disable MRC(Manual Reference Count) and enabling ARC(Automatic Reference Count). To Use MRC(Manual Reference Count) i.e. Disabling ARC(Automatic Reference Count) on MULTIPLE files:
It is possible to disable ARC for individual files by adding the
-fno-objc-arccompiler flag for those files.You add compiler flags in Targets -> Build Phases -> Compile Sources. You have to double click on the right column of the row under Compiler Flags. You can also add it to multiple files by holding the cmd button to select the files and then pressing enter to bring up the flag edit box. (Note that editing multiple files will overwrite any flags that it may already have.)
I created a sample project that has an example: https://github.com/jaminguy/NoArc
See this answer for more info: Disable Automatic Reference Counting for Some Files