ios - Getters and setters for constants? -

is possible create getters , setters constants? want refer constant directly, , have instantiate if it's value nil. constant declared this:

// prefs.h extern myclass * const kthing;  // prefs.m myclass * const kthing = nil; 

and getter/setter like:

// getter + (myclass *)kthing {     _kthing = _kthing ? : [myclass new];     return _kthing; }  // setter + (void)setkthing:(myclass *)myclass {     _kthing = myclass } 

and use like:

[kthing dosomething]; 

is possible?

edit edited methods class methods

global variable declaration in other file dangerous in objective c. ideally use sharedinstance. try this:

in mygame.h

@interface mygame : nsobject {    int mscore; } @property(nonatomic,assign) int score; +(mygame*)sharedobject; -(void)somefunction; @end 

in mygame.m

static mygame *ggame = nil;  @implementation mygame  @synthesize  score = mscore;  +(mygame*)sharedobject {    if(!ggame)    {        ggame = [[mygame alloc] init];    }    return ggame; }  -(void)somefunction {  } @end 

to access anywhere in project:

     #import "mygame.h"       [mygame sharedobject].score;      [mygame sharedobject] somefunction];