Question

What’s the difference between referring to an instance variable in an objective-c class as this:

self.myIvar

and

myIvar

if it’s been declared as a property in the header and synthesized?

Answer 1

If you refer to self.myVar, it will use the @property declared in your header file.

For example

@property(nonatomic, retain) Class *myClass;

If you have

myClass = [ [ Class alloc ] init .... ];

Retain Count will be 1
But if you use

self.myClass = [ [ Class alloc ] init .... ];

Retain Count will be 2 because of the retain property.

It’s the same if you set setter || getter method in the @property.