How to check if an object was initialized? Objective-C

Question

I'm wondering if there is a way to check wether a variable that has been declared has been assigned or initialized or not in Objective C..

thank you

Answer 1

All instances variables are set to 0 (or nil for objects) in the alloc method, see The Objective-C Programming Language.

This means you can check the variable with

if (!var) {...}

Be aware though that there is no way to differentiate between the state after initialization or just being set to 0.

Answer 2

Check if the object is 'nil':

if(object == nil){ };