This is a built-in template used for filling the body of an overridden getter method for property each time it is generated by the program, e.g. when calling the Code | Override Method... function.
The template is editable. Along with Objective-C expressions and comments, you can also use predefined variables that will be then expanded into the corresponding values.
Predefined variables will take the following values:
${CALL_SUPER}   a super method call, for void methods - [super methodName] with or without parameters; for other methods - return [super methodName] with or without parameters
${RETURN_TYPE}   return type of a created method
${DEFAULT_RETURN_VALUE}   value returned by the method by default
${CONTAINING_CLASS}   name of the class where the method is overridden
${IVAR_IS_AVAILABLE}   "true" when the property has an instance variable
${IVAR}   name of the instance variable
${SETTER_SEMANTICS}   in ARC-mode: "copyArc" when copy attribute is set, "assign" otherwise
in non-ARC mode: "copy" when copy attribute is set, "retain" when retain attribute is set, "assign" otherwise
All the predefined variables from the C File Header template (Includes tab) are also available (e.g. ${USER}, ${DATE}, etc.)