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

问题

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?

回答1:

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

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

回答2:

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

;)

回答3:

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.

回答4:

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

回答5:

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!

回答6:

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

回答7:

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

回答8:

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 :

回答9:

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

回答10:

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

回答11:

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

回答12:

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.

回答13:

Add flag “-fno-objc-arc”.

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

回答14:

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

回答15:

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

回答16:

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

回答17:

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.

回答18:

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

来源：https://stackoverflow.com/questions/8651365/using-code-that-doesnt-support-arc-from-an-arc-project

标签

objective-c

xcode

automatic-ref-counting

manual-retain-release