Question

I’m brainfarting here. So I have a method that looks through a NSMutableArray that is a property of another class. The objects are NSString. In the debugger I see it says NSCFString for the object I’m trying to add to an array. So I basically do this:

- (NSArray *)GetFileNames {
    NSMutableArray *fileNameArray = [[[NSArray alloc] init] autorelease];
    for (NSString *str in self.ParentVC.SelectedOptions) {
        [fileNameArray addObject:str];
        NSLog(@"%@", str); // this works fine
    }
    return fileNameArray;
}

And I call this function somewhere else by:

    NSArray *fileNameArray = [[NSArray alloc] initWithArray:[self GetFileNames]];

But for some reason, I get the unrecognized selector sent to instance and it stops on this line. Am I doing something wrong? Any tips to try to troubleshoot the problem? I already checked the self.ParentVC.SelectedOptions and that shows my NSCFString or NSCFStrings I want. Anything I can do in Instruments for this? Thanks.

Answer 1

Replace the second line with

NSMutableArray *fileNameArray = [[[NSMutableArray alloc] init] autorelease];

The real type of the object is what you allocate, not what you declare. In the posted code, the array is not mutable.