Need help on very strange iPhone currency addition and subtraction - iphone

Question

This is 'sorta' urgent since my app just went live today.
My app works fine in the emulator, fine when I copy it to my phone, iPad and other iPhones. We tested the heck out of the app. I submitted it to the appstore and it is now approved and live but an error occurs only with the downloaded appstore app.
Basically i am rebalancing a bill using NSDecimal and number formatters. In the emulator and phone when I step through the code all is well. But the appstore bundle wigs out. It almost appears that the data that I am adding and subtracting is not being initalized.
Has anyone ever seen anything like this?
I know this post is completely vague but trying to figure out where to start debugging if the code in emulator works fine.
--UPDATE-- adding code
-(void)balanceBill:(UITextField*)textField
{
//save the text field data
int row = [textField tag] - 900;
NSString *enteredSplitAmount = [formatter stringWithNoCurrency:[textField text]];
[theGuestTotals replaceObjectAtIndex:row withObject:enteredSplitAmount];
//Get data object
BillDataObject* data = [self theAppDataObject];
int changedSplitBy = 0;
UITableViewCell *cell;
UITextField *cellTextField;
double adjustedBill = 0.0;
NSString *guestAmountFromArray;
//NSString *guestAmountAdjusted;
//Figure out how many guests did NOT have their bill changed & get new bill total
for (NSUInteger i=0; i < [theGuestTotals count]; i++)
{
guestAmountFromArray = [theGuestTotals objectAtIndex:i];
if ([guestAmountFromArray isEqualToString:data.splitByAmountChanged])
{
changedSplitBy++;
}
//Adding ALL guest amounts to get a NEW Bill Total
adjustedBill += [guestAmountFromArray doubleValue];
}
if (changedSplitBy == 0)
changedSplitBy = 1;
//Convert newBill to decimal
NSDecimalNumber *adjustedBillTotal = [[NSDecimalNumber alloc] initWithDouble:adjustedBill];
NSDecimalNumber *originalBillTotal = [[NSDecimalNumber alloc] initWithString:data.totalBill];
NSDecimalNumber *splitBy = [[NSDecimalNumber alloc] initWithInt:changedSplitBy];
NSDecimalNumber *updatedGuestAmount;
//Figure out the the difference is between the new amount and the old amount
NSDecimalNumber *adjustedBillTotalDifference = [originalBillTotal decimalNumberBySubtracting:adjustedBillTotal];
//figure out the difference each guest who did not have their bill changed difference
NSDecimalNumber *guestSplitAmountDifference = [adjustedBillTotalDifference decimalNumberByDividingBy:splitBy];
//loop through array of guest totals to see if a guest total if different from the original split amout
for (NSUInteger i=0; i < [theGuestTotals count]; i++)
{
guestAmountFromArray = [theGuestTotals objectAtIndex:i];
if ([guestAmountFromArray isEqualToString:data.splitByAmountChanged])
{
NSDecimalNumber *guestAmount = [[NSDecimalNumber alloc] initWithString:[theGuestTotals objectAtIndex:i]];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
cell = [tableView cellForRowAtIndexPath:indexPath];
cellTextField = (UITextField*)[cell viewWithTag:i+900];
//add the split amount to the guest amount
updatedGuestAmount = [guestAmount decimalNumberByAdding:guestSplitAmountDifference];
//update the textfield with UPDATED amount
cellTextField.text = [formatter stringWithNumberStyle:NSNumberFormatterCurrencyStyle numberToFormat:updatedGuestAmount];
//replace the guest amount in the array with the UPDATED amount
[theGuestTotals replaceObjectAtIndex:i withObject:[formatter stringWithNumberStyle:NSNumberFormatterDecimalStyle numberToFormat:updatedGuestAmount]];
} else {
//Not equal so just update the amount from what it was...
//this might not be needed but I need to format if it is...
cellTextField.text = [formatter stringWithNumberStyle:NSNumberFormatterCurrencyStyle numberToFormat: [NSDecimalNumber decimalNumberWithString:guestAmountFromArray]];
}
}
//Now all guests who were not edited GOT updated now save that update for the next time this function is run
data.splitByAmountChanged = [formatter stringWithNumberStyle:NSNumberFormatterDecimalStyle numberToFormat:updatedGuestAmount];
//Clear out adjustedBill to get NEW totals after we updated each guest in the loop above
adjustedBill = 0;
//Lets see if we are over or under and do the 'REDISTRIBUTE'
for (NSUInteger i=0; i < [theGuestTotals count]; i++)
{
adjustedBill += [[theGuestTotals objectAtIndex:i] doubleValue];
}
adjustedBillTotal = [[NSDecimalNumber alloc] initWithDouble:adjustedBill];
if ([originalBillTotal compare:adjustedBillTotal] == NSOrderedAscending)
{
[warningImage setHidden:NO];
NSDecimalNumber *overage = [adjustedBillTotal decimalNumberBySubtracting:originalBillTotal];
[overUnderLabel setText:[NSString stringWithFormat:#"%# over",[formatter stringWithNumberStyle:NSNumberFormatterCurrencyStyle numberToFormat:overage]]];
// [self disableDone];
[self enableRedistribute];
}
else if ([originalBillTotal compare:adjustedBillTotal] == NSOrderedDescending)
{
[warningImage setHidden:NO];
NSDecimalNumber *underage = [originalBillTotal decimalNumberBySubtracting:adjustedBillTotal];
[overUnderLabel setText:[NSString stringWithFormat:#"%# under",[formatter stringWithNumberStyle:NSNumberFormatterCurrencyStyle numberToFormat:underage]]];
// [self disableDone];
[self enableRedistribute];
}
else
{
[warningImage setHidden:YES];
overUnderLabel.text = #"";
//[self enableDone];
[self disableRedistribute];
}
}

Answer 1

I think the problem is your attempt to use the UITableViewCells for data storage. You don't push data into the cells, you wait for the UITableView to call YOUR cellForRowAtIndexPath method.
The UITableView will only retain enough cells to fill the screen. As soon as one scrolls out of sight, it will be released. When your loop tries to retrieve it again with cellForRowAtIndexPath: it will allocate a new cell to give you. While your loop may initialize it, it won't be stored or used by the UITable object.

Answer 2

There was a dead store issue with 2 variables in my method. Even though I set them later on I removed them and re-submitted the app. The issue went away.
Thanks for your tips.