How do you differentiate private member variable in objective-c?

for private methods,

I could use

@interface MyClass(PrivateMetho开发者_如何学Gods)
- (void) _foo;
@end  

How do you declare a private member variable in objective c?

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http://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocDefiningClasses.html#//apple_ref/doc/uid/TP30001163-CH12-TPXREF127

@interface MyClass : Superclass {

@private
    NSString * privateString;
}

@end

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You can declare it as follows..

@private //variable;

Check this question out. Question- private-instance-variable