objective c - Default Cocoa Application ViewController.m issue? -

newbie question follows...

i learning objective c based os x cocoa app development. of books , videos have ios, converting simple ios code examples os x.

when create new os x "cocoa application" project, "use storyboards" box checked, default viewcontroller.m in newly created project not have @interface section. expected?

a reply recent question cocoa viewcontroller.m vs. cocoa touch viewcontroller.m indicates user's default viewcontroller.m have @interface section.

currently, manually typing @interface section iboutlets. others doing? or have configuration issue?

i using xcode 6.3.2 on yosemite.

here default viewcontroller.m

// //  viewcontroller.m //  testme // //  created me on 6/19/15. //  copyright (c) 2015 me. rights reserved. //  #import "viewcontroller.h"  @implementation viewcontroller  - (void)viewdidload {     [super viewdidload];      // additional setup after loading view. }  - (void)setrepresentedobject:(id)representedobject {     [super setrepresentedobject:representedobject];      // update view, if loaded. }  @end 

typically interface class (viewcontroller in case) in header file (.h).

however developers use convention of putting class extension @ top of implementation files way of "faking" private methods (which objective c doesn't have.)

so see in .m file:

//the parenthesis here indicate class extension. @interface viewcontroller ()  //only viewcontroller class sees method. -(void) method;  @end  @implementation viewcontroller  -(void) method{     //do stuff here  }  @end 

this not specific ios or macos rather objective c. can see more objective c class extensions here.

the default xcode project not add class extension created viewcontroller class. if create new nsviewcontroller subclass (by going file->new->file->cocoa class, create class subclass of nsviewcontroller, notice new nsviewcontroller subclass have class extension generated @ top of implementation file. not required or necessary, used way of defining closest thing objective c allows private interface.

you can check out this answer more details implementing psuedo-private methods.