How can I fix this error: "ARC forbids explicit message send of 'release' in Xcode"

Question

I'm trying to make a simple animation image in iPhone from an image array:

- (void)viewDidLoad {
    NSArray *imageArray;
    imageArray = [[NSArray alloc] initWithObjects:
                  [UIImage imageNamed:@"sun1"],
                  [UIImage imageNamed:@"sun2"],
                  nil];
    fadeImage.animationImages = imageArray;
    fadeImage.animationDuration = 1;
    [imageArray release];  //==== HERE IS WHERE I GET THE ERROR ======

How can I fix this?

Solution

Solution #1:

Just remove the release statement. ARC will manage it for you.

[imageArray release]; // remove this line

ARC is Auto Reference Counting. As opposite to manual reference counting.
There are a few great videos of talks from WWDC. I can provide the link if you wish to watch them.

In Transitioning to ARC Release Notes, see ARC Enforces New Rules:

You cannot explicitly invoke dealloc, or implement or invoke retain, release, retainCount, or autorelease.

The prohibition extends to using @selector(retain), @selector(release), and so on.

Solution #2:

If you do not wish to convert the code to ARC (e.g. you are not writing a new application, but are maintaining an old one / or you imported so much code that moving to ARC is not worth it) you can disable ARC.

• Disabling ARC for selected files To disable ARC, you can use the -fno-objc-arc compiler flag for specific files. Select the target and go to Build Phases -> Compile Sources. Edit the Compiler Flags and add -fno-objc-arc

• Disabling ARC for the project
  Source:How to disable Xcode4.2 Automatic Reference Counting

  • Click on you project, in the left hand organizer.
  • Select your target, in the next column over.
  • Select the Build Settings tab at the top.
  • Scroll down to "Objective-C Automatic Reference Counting" (it may be listed as
  • "CLANG_ENABLE_OBJC_ARC" under the User-Defined settings group), and set it to NO.

Comments

[Richard J. Ross III]

You should probably elaborate on solution #2, though. Specifically, the -fno-objc-arc flag is your friend.

[Jean]

@RichardJ.RossIII : Done.

[Victor Barba]

I removed the line...

[Victor Barba]

Sorry I press return... I removed the line and I got this return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); and the error Thread 1: signal SIGABRT I'm just trying to make a simple animation, thank you for taking the time to answer this question wherever you are

[Victor Barba]

Still no luck with the animation problem, any body knows how to make a simple animation on Xcode?

[Jean]

@VictorBarba SIGABRT means a serious, unrecoverable, error occurred and abort() was called. Where did you get the code? Is it compatible with your app's memory management? Are you linking to a 3rd party developer framework? Have you tried disabling ARC entirely? Since we are drifting out of the topic of this question (why [anObject release]; produces an error under ARC), maybe you could open a new question about getting the SIGABRT signal, in which you would provide more details, including a short, self contained, compilable, example. This way we could help better.

[Corona]

Solution two worked for me to get NSLogger working. Thanks!