Application initialization and variable scope
G'day all,
Apologies for the newbie question. I'm teaching myself Xcode and making haste slowly. The question is this: I want to initialize a variable (an NSMutableString) when the application opens then access it from from my controller.m file linked to my GUI. I have figured out that I can stick the declaration in main.m but not sure how to see the variable from controller.m and modify it.
Can anyone enlighten me?
Cheers,
A.
Well, remember that Obj/C is C - so extern and all that kind of thing works. You could do:
in main.m
extern NSMutableString* myString ;
NSMutableString* myString ;
int main(bla bla)
{
myString = [[NSMutableString alloc]stringWithFormat:@"bla bla", whatever] ;
}
in Controller.m
extern NSMutableString* myString
.... and myString will be available in Controller.h
A couple of points:
1) Extern are usually declared in .h files and #include to 'pull them in'
2) Extern is a singleton (there's one myString in the whole program)
Robin
