How can I disable ARC for a single file in a project?

It is possible to disable ARC for individual files by adding the -fno-objc-arc compiler 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

https://i.imgur.com/BgteG.png

See this answer for more info: Disable Automatic Reference Counting for Some Files

Disable ARC on MULTIPLE files:

Select desired files at Target/Build Phases/Compile Sources in Xcode PRESS ENTER Type -fno-objc-arc Press Enter or Done

;)

https://i.stack.imgur.com/JVrWg.png

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.

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

Note: if you want to disable ARC for many files, you have to:

open "Build phases" -> "Compile sources" select files with "left_mouse" + "cmd" (for separated files) or + "shift" (for grouped files - select first and last) press "enter" paste -fno-objc-arc press "enter" again profit!

Just use the -fno-objc-arc flag in Build Phases>Compile Sources

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

https://i.stack.imgur.com/HCp0N.png

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 :

https://i.stack.imgur.com/bGKPq.png

use -fno-objc-arc for each file in build phases

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

Please Just follow the screenshot and enter -fno-objc-arc .

https://i.stack.imgur.com/oG8w9.png

https://i.stack.imgur.com/0KAd4.png

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:

Select desired files at Target/Build Phases/Compile Sources in Xcode PRESS ENTER Type -fobjc-arc Press Enter or Done

Add flag “-fno-objc-arc”.

Simple follow steps : App>Targets>Build Phases>Compile Sources> add flag after class “-fno-objc-arc”

Just use the -fno-objc-arc flag in Build Phases>Compile Sources infront of files to whom you dont want ARC to be apply.

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.

select project -> targets -> build phases -> compiler sources select file -> compiler flags add -fno-objc-arc

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