由于未捕获的异常“ NSRangeException”而终止应用程序，原因：“ ***-[NSMutableArray objectAtIndex：]：索引26超出范围[0 .. 0]”

Question

I would appreciate some help. I have used this before and it worked fine. I tried to use it in a new app and it breaks. I understand it is a problem with the index, but I can't pin point it.

    self.greensArray = [NSMutableArray array];
    for (int i = 0; i < 26; ++i) {
    [self.greensArray addObject:[NSMutableArray array]];
    }


letterIndex =[[NSMutableArray alloc] init];

NSMutableArray *name = [searchViewArray valueForKey:@"meatName"];
for (int i = 0; i < [name count]; ++i) {
    NSUInteger firstLetter = [ALPHA rangeOfString:[[name objectAtIndex:i ] substringToIndex:1]].location;
    [self.greensArray insertObject:[NSMutableArray array] atIndex:i];
    if (firstLetter != NSNotFound) {
        [[self.greensArray objectAtIndex:firstLetter] addObject:[name objectAtIndex:i]];
    }
    char alphabet = [[name objectAtIndex:i] characterAtIndex:0];
    NSString *uniChar = [NSString stringWithFormat:@"%C",alphabet];
    if(![letterIndex containsObject:uniChar])
    {
        [letterIndex addObject:uniChar];

    }
}

Answer 1

The problem was here: [self.greensArray insertObject:[NSMutableArray array] atIndex:i]; I don't know why this worked in my first application, but this line of code added additional values to the greensArray. That threw off the integer / meatName count and made the whole app crash.