To Lower Case

ToLowerCase.m

-(NSString *) ToLowerCase : (NSMutableString *) inputString
{
    NSInteger i = 0;
    while (i < inputString.length)
    {
        int character = [inputString characterAtIndex:i];
        if (character < 97)
        {
            [inputString replaceCharactersInRange:NSMakeRange(i, 1) 
                    withString:[NSString stringWithFormat:@"%c",character+32]];
        }
        i++;
    }
    return  inputString;
}