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I am going to write app for iphone 4.X and I have to implement it quickly.I read that automatic reference counting(ARC) manages the memory and consequently it will save my time.I have read this article, in which saying that ARC also works for iOS 4.3.
Have someone such practice and how much it will be efficiently manage my application memory?
Thanks.
Flanfl’s answer is incorrect.
iOS 4 does support ARC, but without support for automatic weak reference zeroing. Also known as “ARClite”.
See Apple’s document on “Objective-C Feature Availability Index“.
See this other question on StackOverflow.com:
Is ARC really supported in iOS 4? The iOS 4.2 SDK is missing ARC-related symbols at linking time
By the way, version 4.2.1 is the latest version of iOS 4 that runs on all devices that cannot support iOS 5 & 6. Specifically, on the iPhone 3G and iPod touch (2G) version 4.2.1 is the highest supported OS. That is according to my reading of this Wikipedia page, List of iOS Devices.
As to the original question: Yes, ARC eliminates the need for calls to retain and release in most common apps. That makes managing memory much easier for you. Apple strongly recommends ARC for both new projects and for older projects that can be refactored appropriately.
In Apple’s iOS developer web site, see documents and WWDC videos explaining the details of ARC and how use it in your apps. For example, Transitioning to ARC Release Notes.
In iOS 4, in particular, you should set to nil all outlet references in your class’ dealloc method.