Instance variables declared in ObjC implementation file?

This is indeed a new language feature, and if you must declare your ivars (rather than simply declaring properties and letting the compiler generate ivars for you) it's a good practice. Your header files in theory should only expose public interface for your classes; everything else belongs in the implementation.

Declaring iVars inside the implementation is definately a new construct in objective C. You need to be using xcode4.2 and have the LLVM compiler selected in your build settings. The idea is to keep your header files cleaner.

You can list your ivars inside curly braces like this example; @implementation MyClass { int var1; int var2; } The answer given by Rahul is not really correct, although you can delare variables in the way he says they would be looked upon as static by the compiler. Probably for the cases in which he used them it didn't matter.

Yes you can declare in implementation file. I have used this many times like before a method I declare an int variable for counter purpose. It's not about practice it's about requirement.

Here is a sample code snippet BOOL alertShownAlready = FALSE; // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { super viewDidLoad; //Add chat view controller's view self addChatRoomViewController; }.

2 Sounds like you've declared something like a static int for some purpose, a common practice. But variables declared inside the implementation file within the curly brackets is not something I've seen before in source code in other project. Are you sure you've done the exact same thing as described above?

And why would one ever use @private when one can declare instance variables inside the implementation file? – Wolfgang Schreurs Jul 22 at 7:21 Yes I have declared something like as asked above. I didn't meant for private variable.It's just for some loop counter.

I didn't declared static int just a simple int and I've also declared BOOL variable in implementation file. – Rahul Vyas Jul 22 at 7:29 Are you sure about that? I'd like to see a full, complete example of this that compiles without warnings or errors.

I've tried several different possible combinations, and I can't get this to work. – Adam Rosenfield Jul 29 at 18:20 @Adam Rosenfield: I guess I shouldn't accept the answer then, until a working example is posted. – Wolfgang Schreurs Jul 31 at 15:32 3 @Wolfgang Schreurs This does not declare an instance variable, but a global variable.

– albertamg Jul 31 at 17:33.

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