ios5 ARC what is the compiler flag to exclude a file from ARC?
I found the answer: to exclude the file from ARC, use the -fno-objc-arc flag in build phases>compile sources
automatic-ref-counting
NSError and __autoreleasing
Consider how ARC works with variables – each reference variable has a mode (implicit or explicit): strong, weak, etc. This mode let’s ARC know how to handle reads and writes to that variable; e.g. for a strong variable reading requires no additional action while writing requires releasing the existing reference in the variable before it … Read more
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. This is on Xcode 4.2 (Build 4D199).
Why does ARC retain method arguments?
See this reply from the Objc-language mailing list: When the compiler doesn’t know anything about the memory management behavior of a function or method (and this happens a lot), then the compiler must assume: 1) That the function or method might completely rearrange or replace the entire object graph of the application (it probably won’t, … Read more
Custom dealloc and ARC (Objective-C)
When using ARC, you simply do not call [super dealloc] explicitly – the compiler handles it for you (as described in the Clang LLVM ARC document, chapter 7.1.2): – (void) dealloc { [observer unregisterObject:self]; // [super dealloc]; //(provided by the compiler) }
iOS 5 Best Practice (Release/retain?)
For anyone still curious about how to turn off ARC on individual files, here’s what I did: Go to your project settings, under Build Phases > Compile Sources Select the files you want ARC disabled and add -fno-objc-arc compiler flags. You can set flags for multiple files in one shot by selecting the files then … Read more
AVAudioPlayer stops playing immediately with ARC
The problem is that when compiling with ARC you need to make sure to keep a reference to instances that you want to keep alive as the compiler will automatically fix “unbalanced” alloc by inserting release calls (at least conceptually, read Mikes Ash blog post for more details). You can solve this by assigning the … Read more
Zeroing Weak References in ARC
It’s mostly right, but assign properties are still treated the same as they ever were, only weak ones are zeroing. Another caveat is that zeroing weak references are only available in Mac OS X ≥ 10.7 and iOS ≥ 5. While the rest of ARC was backported to 10.6 and iOS 4, weak references cannot … Read more
ARC memory leaks
You’re probably running this code on a background thread, and don’t have an autorelease pool in place. ARC will still autorelease objects for you on occasion, and if you’re calling into Apple frameworks, they may still be non-ARC, so they definitely could be autoreleasing objects for you. So you still need an autorelease pool in … Read more
How to enable ARC for a single file
Add the -fobjc-arc flag to any files for which you’d like to enable ARC, as described in the ARC documentation.