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If you have Class A with an instance var "foo" which has a @property/@synthesize directive, and Class B inherits from Class A, does it also need to @property/@synthesize "foo"? The reason I ask is because when I try to use Class B's "foo", the calling class says that "foo" is not something of a structured union or a member, which makes me believe it needs to be explicitly synthesized.
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@synthesize tells the compiler to take care of the accessor methods creation i.e it will generate the methods based on property description. It will also generate an instance variable to be used which you can specify as above, as a convention it starts with _(underscore)+propertyName.
@synthesize creates a getter and a setter for the variable. This lets you specify some attributes for your variables and when you @synthesize that property to the variable you generate the getter and setter for the variable. The property name can be the same as the variable name.
Default Synthesis Of Properties Clang provides support for autosynthesis of declared properties. Using this feature, clang provides default synthesis of those properties not declared @dynamic and not having user provided backing getter and setter methods.
Swift provides no differentiation between properties and instance variables (i.e, the underlying store for a property). To define a property, you simply declare a variable in the context of a class. A swift class is simply a ClassName.
No, you don't. Synthesized properties are added to class A and its subclasses automatically.
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