objective-c access level?

Yes, but they are rarely used. You can specify @protected or @private if you want. That is an artifact of old-school object-oriented software which really isn't practical in the real world.

You can indicate that attriburtes are public, protected or private, which will protect them from illegal access at compile-time. Protected is the default in Objective-C. However, becasue Objective-C is a dynamic language, you can't really control run-time access to the attributes the way you can in a static language.

All methods are public, all the time, in Objective-C. You can mark them as @interface and @implementation to indicate that they are (or aren't) supposed to part of the object's API. Methods marked @implementation won't be exposed. But that doesn't actually stop anyone from calling them if they know the methods exist.