Question

Of Objective C, I’m looking to call a variable from one .m to the other .m

This is given myvar declared as an int in Example1.h

Example1.m

myvar = myvar+10

Example2.m

if (myvar == 10){NSLOG("@myvar equals the correct integer: %i",myvar);}

However, by default myvar will equal 0 because myvar is called from Example1.h in Example2.m.

Answer 1

For global values, create a class to hold these and define the variables as static. You can also define class level methods to manipulate the static variable. I call my class appState. You might define myVar as static and then class methods (use the + not -) to get and set this variable.

Here’s an example of a BOOL I can access from anywhere in my application.

account.h

#import <Foundation/Foundation.h>

@interface Account : NSObject 
{
}

+(BOOL)isOffLine;
+(void)setOffLine:(BOOL)newValue;

@end

account.m

#import "Account.h"

@implementation Account

static BOOL _offline;

+(BOOL)isOffLine;
{
    return _offline;
}

+(void)setOffLine:(BOOL)newValue
{
    _offline = newValue;
}

@end

Now from any class in my application, I can #import account.h and then use something like:

if ([Account isOffLine]) {...}

or

[Account setOffLine:YES];

Note that I didn’t create an instance of this class. I’m calling the class level methods. The value will persist between calls from different classes in my application.