Question

I have problem that im trying to get solve for like week.
My goal is to get variable out of my IBAction, to use for example in -(void)viewDidLoad..
But as far as I am now I can use my variable only in my IBAction..

- (IBAction) changeLat:(NSNumber *)str {

longi =  str; 
double lop = longi.doubleValue;

NSLog(@"%f",lop);
}

- (void)viewDidLoad
{
[super viewDidLoad];

NSLog (@"%@",lop);
}

It NSLog shows everything fine in action, but in view did load it doesn’t even recorganize it.

Answer 1

Actually, IBAction is converted to void by the preprocessor. It’s used by Interface Builder as a label that identifies this method as an action able to be related from an IB Object.

There’s no way (AFAIK) to use two return types in a function (for example `(IBAction double)´, equivalent to ´(void double)´), but a good practice could be something like this:

- (IBAction)changeLatAction:(id)sender {
    NSNumber *str = <get the NSNumber from a valid place>;
    [self changeLat:str];
}

- (double) changeLat:(NSNumber *)str {
    longi =  str; 
    double lop = longi.doubleValue;
    NSLog(@"%f",lop);
    return ????;
}

Your first declaration of changeLat seems to be wrong, because as a first parameter you’ll always get the “sender” or “caller” object, related from IB (when called from an action, of course), so, you need to get the str value from a valid place.

Cheers.