Using global variables in Objective-C

Question

First of all, I tried almost all the solutions given in stackoverflow but I didn\'t succeed in implement global vars, I even did a step by step tutorial and still I get the

Answer 1

You can't put extern variables to *.h file.

So in GlobalVariables.m you have:

extern NSArray *farmerlist;
NSArray *farmerlist;

And:

@interface GlobalVars : NSObject
{
}

@end

@implementation GlobalVars
{

}
@end

are not needed

[edit]

for example:

Other.m

#import "GlobalVars1.h"

GlobalVars1.h

extern NSArray *truckBoxes;
extern NSArray *farmerlist;
extern NSString *farmerCardNumber;

extern NSString *fName;

GlobalVars.h

#import 

@interface GlobalVars : NSObject
{
}

@end

GlobalVars.m

#import "GlobalVars.h"

NSArray *farmerlist;
NSArray *truckBoxes;
NSString *farmerCardNumber;
NSString *fName;
@implementation GlobalVars
{

}
@end