automatic-ref-counting

I'm trying a simple example as seen here: https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AutomaticReferenceCounting.html#//apple_ref/doc/uid/TP40014097-CH20-XID_88 And this is my code. (Ignore other possible code, this is a empty project with this code written inside an empty UIViewcontroller viewDidLoad) dispatch_async(dispatch_get_main_queue()) { [unowned self] in println(self) } I don't understand why it crashes when I run the pro thread #1: tid = 0x1a796, 0x00284d18 libswiftCore.dylib`_swift_release_slow + 8, queue = 'com.apple

What I understand is: Memory leaks occur when memory has not been freed or "released" Dangling pointers occur when the pointer is NOT set to nil AND the object is released. my question is: Can setting the object to nil free the memory and clear the pointer reference? i.e. Car *myCar = [[Car alloc] initWithCoolRims: YES]; myCar = nil; //no mem leaks or dang pointers or does the ARC do this: Car *myCar = [[Car alloc] initWithCoolRims: YES]; [myCar release]; myCar = nil; //no mem leaks or dang pointers Thankyou Under ARC For your first example myCar will be set to nil and the newly created Car

Is there a way to ask the compiler if ARC is turned on, and then conditionally compile based upon that value? For example, I have a protocol: @protocol ProtocolA @required -(void)protocolMethodOne @optional -(void)protocolMethodTwo; @end If I'm using ARC, I would like to make protocolMethodA optional when using ARC, and required when not using ARC. This is because one of the main reasons for utilizing this method is to dealloc the object instance. With that said, here's what I would like to happen: @protocol ProtocolA #ifdef SOME_ARC_VARIABLE @optional #else @required #endif -(void

I am creating iPhone app and in between I need to use SDWebImage . For this I need to use ARC. Any idea how to add ARC in between in project? Note: In one file I have below content. #if !__has_feature(objc_arc) #error SDWebImage is ARC only. Either turn on ARC for the project or use -fobjc-arc flag #endif Where should I add -fobjc-arc flag? Select Project Form Project Manager | | Targets | | Build Phases | | Compile Sources | | Select File that you Want to crate as ARC. (You can also Select Multiple File name from here) | | Press "ENTER" key | | Popup Box/Window is displayed | | Write here - '

In versions of Xcode previous to 5, we can disable ARC in the project settings when we create the project. Now ARC is causing this problem for me. With an property list file, for the reading step, the compiler gives me an error: "implicit conversion of 'int' to 'id' is disallowed with ARC". I did not have this problem with the same code with Xcode 4. In my property list file, The keys are numbers and also in my viewController.m When I disallow ARC for the target, the warning persists. I don't see how I can add a compiler flag. The code (with French strings): NSString *error; NSString *rootPath