CODEWITHSUNDEEP
objective-cnsstring
gubbfett
gubbfett

Reputation: 2177

Global string function

I'm quite new to Obj-c and i'm trying to figure out how to use global functions. I'm working on a small project where i talk to a PHP API and this sets a session cookie, i have found how the get the cookie data, now i want to make it a little more effective by making a NSString function that gets the latest cookie value... And i am confused...

I have created a Globals object class, "Globals.h" and "Globals.m".

How do i declare a function and then access it from another file?

What i have now, Globals.h

#import <Foundation/Foundation.h>
@interface Globals : NSObject

-(NSString*)GlobalString;

@end

and Globals.m:

#import "Globals.h"
@implementation Globals
-(NSString *)Globalstring
{
    return @"This is a global string!";
}
@end

I understand that i have to #import the Globals.h in the files where i want to use this, but i can't see this NSString function. Help? Good link for tips and tutorials for beginners like me?

Upvotes: 0

Views: 72

Answers (3)

Mike Weller
Mike Weller

Reputation: 45598

Using - before the method name makes it an instance method. You probably want a class/static method so that it can be invoked on NSString directly. Use a + instead:

+(NSString*)GlobalString;

And to use it:

NSString *foobar = [NSString GlobalString];

Also note that Objective-C methods are usually camelCase not CapsCase.

Upvotes: 2

Hermann Klecker
Hermann Klecker

Reputation: 14068

You could create a globals object that contains all global variables. If you do that have a look at the singleton pattern. By doing so you could fetch your globalString by someString = [Globals globalString]; if you design it as a class method rather than an instance method.

Hovever you could use your application delegate as a container for values and functions of globlal charachter. You can allways access your delegate by 

MyAppDelegate *myDelegate = (MyAppDelegate) [[UIApplication sharedApplication] delegate];

and then access your global function - which is now a method of MyAppDelegate: 

returnValue = [myDelegate myGlobalFunction:theParameter];

Upvotes: 0

ruipacheco
ruipacheco

Reputation: 16422

You need to declare an instance of Globals and then call GlobalString:

You could make GlobalString a class method + (NSString *)GlobalString or declare a C function in a .c file.

Upvotes: 0

Related Questions