Accesing global variable giving linker error in objective C

Question

I have declared a global variable like below

extern NSString *name;
@interface viewcontrollerOne{}

in implementation file i am accessing that g

Answer 1

extern is tipically used to create contants. If you want to Create a global variable string, you can do it in the following way:

.h

+ (void)setName:(NSString*)name_in;

+ (NSString*)name;

.m

NSString* gName;

@implementation ...

+ (void)setName:(NSString*)name_in{
   gName = name_in;
}

+ (NSString*)name{
  return gName;
}