objective c - Class Name with a "+" -

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i working on ios project in xcode , see classes have names "+"; example: tableviewcontroller+tableview.h , class named: @interface rktableviewcontroller (tableview) opposed rktableviewcontroller+tableview.

what + , (tableview)? if subclassing uitableview shouldn't class declared as: subclassed name : parent class name format?

the + in filename isn't semantically important. naming file "classname+categoryname.h/m" popular convention naming files containing categories.

@interface rktableviewcontroller (tableview) @end

declares category called "tableview" on rktableviewcontroller class. categories used add methods class outside main implementation. see apple documentation on categories here: http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/objectivec/chapters/occategories.html


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