What does "@public" mean in Objective-C?

Question

After reading the question on @private, I understand how this works. However, since all variables are @protected by default, and you cannot really access the variable without defining access, what does @public do? When do you use it?

Answer 1

When do you use it? When you need it public. To access it from outside this class (without any additional accessories), that is. :)

Answer 2

@public means ivar is available anywhere.

@private means ivar is available for class instances

@protected , ivar .

ivar , C → .

foo->instanceVarible = xyzzy;

? : . @private ( IBOutlets) accessors .

Answer 3

@public - . , , @public, . . , .

Answer 4

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, @private , . , , , ( ).

@protected , . . , , Objective C setter getter . @protected .

@public . , , /, - . , , .

, @public - C.

You can, of course, not define any accessories for the class variable because they are internal to the class or because you declare it as @public, but since Objective-C makes it easy to prototype them @propertyand @synthesizeit doesn't make much sense. Class internal variables do not need setters / getters, because any class method can access them directly.