CODEWITHSUNDEEP
uitableviewcore-dataswift3ios10nsfetchedresultscontroller
Peeyush karnwal
Peeyush karnwal

Reputation: 642

'NSRangeException': row (1) beyond bounds (1) for section (0)

I have a chat Application in which messages are being fetched and updated in my tablview using NSFetchResultsController. Here is my code: 

func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>)
    {
        self.tblViewChatLog.endUpdates()
        scrollToBottom(animated: true)

        if self.fetchedResultsController.fetchedObjects?.count == 0 {
        }
        else {
        }
    }

    func scrollToBottom(animated: Bool)
    {
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1)
        {
            let secCount = self.tblViewChatLog.numberOfSections
            if secCount > 0
            {
                let sections = self.fetchedResultsController.sections
                let secInfo = sections?.last

                let rows = secInfo?.objects //secInfo?.numberOfObjects
                if (rows?.count)! > 0
                {
                    let indexPath = NSIndexPath(row: (rows?.count)!-1, section: secCount-1)
                    self.tblViewChatLog.scrollToRow(at: indexPath as IndexPath, at: .bottom, animated: animated)
                    self.view.updateConstraintsIfNeeded()
                    self.tblViewChatLog.updateConstraintsIfNeeded()
                }
            }
        }
    }

I'm getting following error while trying to update my table.

Terminating app due to uncaught exception 'NSRangeException', reason: '-[UITableView _contentOffsetForScrollingToRowAtIndexPath:atScrollPosition:]: row (1) beyond bounds (1) for section (0).' *** First throw call stack: (0x21f15b0b 0x216d2dff 0x21f15a51 0x2672a9c1 0x2672a45f 0x13e7b4 0x54e90 0x19adba7 0x19b78e9 0x19adb93 0x19c156d 0x19afb43 0x19b2157 0x21ed7755 0x21ed5c4f 0x21e241c9 0x21e23fbd 0x23440af9 0x2655c435 0xcc554 0x21ad0873) libc++abi.dylib: terminating with uncaught exception of type NSException

Upvotes: 2

Views: 2601

Answers (1)

Pragnesh Vitthani
Pragnesh Vitthani

Reputation: 2540

The error tells you that your table does not have any row at index 1. It means that your table view consists of 1 row and maximum range of indexPath.row can be 0 (because row index of a UITableView starts from 0). Whenever you will call a row at index path beyond range of the table, it will throw an error.

Upvotes: 3

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