Developing Iphone app for iOS 4.0 in iOS 5.0?

Question

I developing iPhone application for iOS 4.2 using latest SDK iOS5. I trying to add external classes Kal

but i gives me error "ARC forbids explicit message send of 'autorelease', 'retain', and 'release'". And i want to add this classes in my application in any how condition. I want to execute that classes in my application. I stuck on two points basically, 1) How i use explicit use of retain, release, and autorelease keywords 2) How i deploy my app on 4.0 lower version from latest iOS 5.0(Containing ARC scheme)

Thanks RRB

Answer 1

See this question for an explanation of how to disable ARC on a per-file basis. The solution here is probably to disable ARC for the Kal files while leaving it enabled for the rest of your project. (ARC works fine on iOS 4.0 with a couple of minor exceptions.)

Answer 2

There is a refactoring that will convert your classes to be compatible with ARC.

In XCode menu: Edit - Refactor - Convert to Objective-C ARC.

Answer 3

You can turn the ARC off in the Xcode 4.2 for your project.

For more info , see the blogpost

Also , see this SO question