automatic-ref-counting

i not sure about convert project to Automatic Reference Counting(ARC). it still support on iOS 4.X or lower ? thank you From what I can gather yes - ARC is done by the compiler and should be thought of as a wizard or helper that checks all of your code and inserts the correct retain and release statements for you. This will therefore be compatible with older iOS runtimes. Edit: IT will support 4.x but not 3.x It will support iOS 4 but not iOS 3. Still, there's no full support for iOS 4 since weak references only work on iOS 5. Quoting the Transitioning to ARC Release Notes directly from Apple:

I am have read up some tutorials on ARC and am still left a bit confused on properties declarations. I wrote most most my code using the following pattern: @property (readwrite, nonatomic) PlayerData* playerData; @property (readwrite, nonatomic) MusicLayer* musicLayer; @property (readwrite, nonatomic) bool isPowerUpAvailable; Now that I finally started to deal with memory leaks XCode suggested me that in some bits of code I should have added the "retain" keyword in the property declaration. Using ARC I thought I shouldn't "Bother" about retain counts anymore. Is there some concept I am not

I converted my huge IOS program to ARC using xcode auto conversion. After that I am getting the following error: [CFString retain]: message sent to deallocated instance The trace shows the following line where it crashed: UIImage *image = [[UIImage alloc] initWithContentsOfFile:tile.imagePath]; Next line in the trace gives:__arclite_objc_retainAutoreleasedReturnValue at /SourceCache/arclite/arclite-7.1/source/arclite.m:241 Can someone suggest me where I can look further, or what can I do to remove this crash? Thanks a lot EDIT: Looks like the (NSString *)p initialization in the code below

Examine the following code, and assume it was compiled under ARC: - (void)foo { NSOperationQueue *oq = [[NSOperationQueue alloc] init]; [oq addOperationWithBlock:^{ // Pretend that we have a long-running operation here. }]; } Although the operation queue is declared as a local variable, its lifetime continues beyond the scope of the method as long as it has running operations. How is this achieved? UPDATE: I appreciate Rob Mayoff's well-thought-out comments, but I think I did not ask my question correctly. I am not asking a specific question about NSOperationQueue, but rather a general

I was testing swift closure with Xcode playground. This is my code: import UIKit class A{ var closure: ()->() = {} var name: String = "A" init() { self.closure = { self.name = self.name + " Plus" } } deinit { print(name + " is deinit") } } var a: A? a = A() a = nil As what is expected, a is self contained by closure, so a is never released. But, when I add this line before the last line: a?.closure = { a?.name = "ttt" } Then, I found "A is deinit" in the output window, which means a is released. Why? is a not recycle reference? To be test, I use a function to set the closure, which the code is

i am trying to use NSThreads with ARC in 4.3.5. With iOS 5 everything works perfect, but if i try it on a older iOS like 4.3 its leaking. Normally i would use a Autoreleasepool for NSThreads but since there is no manual Autoreleasepool in ARC i don't know how to fix this. I get loads of Messages like "__NSAutoreleaseNoPool(): Object 0x4567b40 of class NSComparisonPredicate autoreleased with no pool in place - just leaking" in my Console after i start a Thread. NSThread detachNewThreadSelector:@selector(showAlert) toTarget:self withObject:nil]; How to correctly thread with ARC and iOS prior to

I'm new to Objective-C, I try to port an old Objective-C project written in an older version of Objective-C to the new one, but I'm getting the following compiler error: ARC forbids explicit message send of 'retain' in color = [aColor retain]; or color = [[NSColor blackColor] retain]; I was reading about the new automatic reference counting that clang is using now. I have also tried to use Xcode's refactor function but with no luck... What is the proper Objective-C code that need to replace this old code? Simply: color = [NSColor blackColor]; ARC will manage the lifetime of your objects so you