InsertRowsAtIndexPaths错误迅速

Question

I have an uitableview and i try to append it by insertRowsAtIndexPaths function. The uitableview appends nicely if i simply add data to the data source arrays, but gives me hard time inserting it by the mentioned above function.

Here is my code

    func insertData(){

// appending arrays
    answersdict.append(answersmain[answertitle1]![0]) // count 1
    resultanswers2d.append(carsmain[answertitle1]!) // count 3
    self.tableView.reloadData()

// inserting rows

    self.tableView.beginUpdates()

    let insertedIndexPathRange = 0..<carsmain[answertitle1]!.count + 1 // total count 4
    var insertedIndexPaths = insertedIndexPathRange.map { NSIndexPath(forRow: $0, inSection: 1) }

    self.tableView.insertRowsAtIndexPaths(insertedIndexPaths, withRowAnimation: .Fade)
    self.tableView.endUpdates()

My datasource count for sections is 2 (so section 1 exists) and for numberOfRows - its equal to resultanswers2d[section].count + 1 which gives me 4

So i'm trying to insert 4 rows into the already appended array that has 4 possible rows in that section, but i'm constantly getting errors like

The number of rows contained in an existing section after the update (4) must be equal to the number of rows contained in that section before the update (4), plus or minus inserted cells (4 inserted, 0 deleted)

or if i try to hard

malloc_error

Got stuck. Need any insights. Thank you.

Answer 1

Delete the line to reload the table.

insertRowsAtIndexPaths updates the table accordingly.

The number of insertions and the positions in data source and table must match.

Answer 2

Simply don't call self.tableView.reloadData() . The beginUpdate and endUpdate sections should suffice.

UPDATE: Also, remember to insert the new section too in the beginUpdate endUpdate block.