Objective-C synthesize property name overriding

Question

I am trying to understand the purpose of the synthesize directive with property name overriding. Say that I have an interface defined as follow:

Answer 1

Your understanding is incorrect. dummyLabel is the name of the property, and is not an alias for the instance variable - the instance variable is only called _dummyLabel. So the following holds for an instance of Dummy called myObject:

• [myObject dummyLabel] works
• myObject.dummyLabel works
• [myObject _dummyLabel] fails
• myObject._dummyLabel fails
• myObject->dummyLabel fails
• myObject->_dummyLabel depends on the visibility of the ivar (@public, @private, @protected)
• [myObject valueForKey: @"dummyLabel"] works
• [myObject valueForKey: @"_dummyLabel"] depends on the implementation of +accessInstanceVariablesDirectly (i.e. it will work in the default case where +accessInstanceVariablesDirectly returns YES).