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Asked: 2026-06-06T08:29:42+00:00

I have a .m file, containing a @implementation , but it has gotten too

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I have a .m file, containing a @implementation ,
but it has gotten too big and I’m trying to move some of the method functions to a 2nd file.

Both .m files begin with 

@implementation GesticulatorViewController

@synthesize score_display;
@synthesize game_status;
@synthesize player_options;
@synthesize total_players_field;
@synthesize gesticulation_sentence;
@synthesize gesticulation_input;
@synthesize main_view_manager;
@synthesize game_state;

But I’m getting linker warning:
“ld: duplicate symbol _OBJC_IVAR_$_GesticulatorViewController.gesticulation_input “

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1 Answer

  1. Editorial Team

    You cannot have the same class implementation in two different files.

    In your case, you cannot split the implementation of GesticulatorViewController into two .m files.

    EDIT:

    I would use Objective-C categories to disperse the implementation.

    With categories, you have the opportunity to group together methods that perform similar tasks.

    Here’s an explanation of “Categories and Extensions” from Apple’s documentation:
    https://developer.apple.com/library/mac/#documentation/cocoa/Conceptual/ObjectiveC/Chapters/ocCategories.html#//apple_ref/doc/uid/TP30001163-CH20-SW1

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