Question

I receive a SIGABRT when I try to get a non-null variable. Code:

NSLog(@"%@", appDelegate.xmlData.magDictionary);
for (Magazine *ibb in appDelegate.xmlData.magDictionary) {
        NSLog(@"%@", [ibb title]);
}

Output:

   {
        1 = "<Magazine: 0x6c8fe10>";
        2 = "<Magazine: 0xf168d00>";
        3 = "<Magazine: 0xf169f50>";
        4 = "<Magazine: 0xf16b6d0>";
        5 = "<Magazine: 0xf170490>";
        6 = "<Magazine: 0xf1716c0>";
        7 = "<Magazine: 0xf172a80>";
        8 = "<Magazine: 0xf173f10>";
    }

and SIGABRT on NSLog(@”%@”, [ibb title]);
The Magazine model: @synthesize title, key, teaser, tags, items, progressBar;

Answer 1

According to the comments, it appears that you do wrong in your Magazine initializer.
Using retain mode for the property doesn’t really matter, but I would have used copy instead for string.

Anyway, the title string coming from originalMag isn’t retained, or copied at all when assigned to the title ivar of your Magazine, thus I bet it is deallocated before you try to print any value, causing the crash.

Another point, doing :

title = [[NSString alloc] init];
title = [originalMag title];

generates a memory leak (and you still don’t retain the original title).
Rewrite the initializer like so :

-(id)initWithMagazine:(Magazine *)originalMag {
    .....
    title = [[originalMag title] copy];
    // or title = [[NSString alloc] initWithString:[originalMag title]];
    ....
}

and this should solve your app crash.