How to make a real private instance variable?

Question

I want to make an instance variable that can\'t be accessed from outside. Is something like that possible in objective-c? I remember Apple has private variables and stuff li

Answer 1

You can not make a real private instance variable. Objective-C is a dynamic language and therefore it is possible to access any variable (even @private).

My best approach:

Use it in the implementation block of you .m file. Then it is not visible and block KVC, so that KVC will not work

@implementation ClassName {
    // default to @protected
    // but the subclasses can't see ivars created in the implementation block
    float number;
}

+ (BOOL)accessInstanceVariablesDirectly {
    return NO; // no KVC
}

@end