Getting Stack Error, Unexplained

Question

I have this code

-(IBAction) generateFlashNow:(id)sender{

[textField resignFirstResponder];
NSString *string1 = textField.text;
//NSString *string2 = [string1 stringByReplacingOccurrencesOfString:@"" withString:@","];
NSArray *arrayOfLetters = [string1 componentsSeparatedByString:@","];

NSLog(@"Log Array :%@", arrayOfLetters);

//NSArray *imageArray = [[NSArray alloc] init];

NSLog(@"Log First Letter of array: %@",[arrayOfLetters objectAtIndex:0]);

runLoopTimes = [arrayOfLetters count];
runLoopTimes = (runLoopTimes -1);
NSLog(@"Letters:%d", runLoopTimes);

int timesThroughLoop;

while (runLoopTimes > 0) {
    NSLog(@"loopedy Loop");

    NSString *LetterString = [NSString stringWithFormat:@"%@", [arrayOfLetters objectAtIndex:indexTimes]];
    timesThroughLoop --;
    NSLog(@"letter String : %@", LetterString);
    indexTimes ++;

    if (runLoopTimes == 0) {
        return; 
    }
}

NSLog(@"done");


}

and i get this log report, when I type into the text field 's,a,m'

[Session started at 2010-01-15 15:50:30 +1300.]
2010-01-15 15:50:35.398 Flash![39290:207] Log Array :(
s,
a,
m

) 2010-01-15 15:50:35.399 Flash![39290:207] Log First Letter of array: s 2010-01-15 15:50:35.399 Flash![39290:207] Letters:2 2010-01-15 15:50:35.400 Flash![39290:207] loopedy Loop 2010-01-15 15:50:35.400 Flash![39290:207] letter String : s 2010-01-15 15:50:35.401 Flash![39290:207] loopedy Loop 2010-01-15 15:50:35.401 Flash![39290:207] letter String : a 2010-01-15 15:50:35.402 Flash![39290:207] loopedy Loop 2010-01-15 15:50:35.402 Flash![39290:207] letter String : m 2010-01-15 15:50:35.404 Flash![39290:207] loopedy Loop 2010-01-15 15:50:35.405 Flash![39290:207] * Terminating app due to uncaught exception 'NSRangeException', reason: '* -[NSCFArray objectAtIndex:]: index (3) beyond bounds (3)' 2010-01-15 15:50:35.406 Flash![39290:207] Stack: ( 29287515, 2538743049, 29371451, 29371290, 478409, 74279, 9945, 2716761, 3124130, 3132867, 3128079, 2821683, 2730012, 2756789, 37383889, 29072256, 29068360, 37377933, 37378130, 2760707, 9228, 9082 )

and I have no idea what I am doing wrong, so any help is appreciated.

Cheers, Sam

Answer 1

You never decrement runLoopTimes inside the loop. So it will loop indefinitely. And eventually indexTimes is off the end of the array.