Fatal error: Array index out of range

Question

My Situation:

There is an array called friendCardList claimed in the AppDelegate.swift, and the CardModel is just normal class :

var friendCardList:[CardModel] = []

In a UITableViewController called FriendListVC, the elements in the array friendCardList will be listed in the FriendListVC:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let delegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let card = delegate.exchangeListCards[indexPath.row]
    let cell = tableView.dequeueReusableCellWithIdentifier("CardsCell",
    forIndexPath: indexPath) as! BrowserTableViewCell
    return cell
}

I was trying to delete the cell in the FriendListVC:

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
    let delegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let card = delegate.exchangeListCards[indexPath.row]
    var CardSet = NSMutableSet(array: delegate.exchangeListCards)
    CardSet.removeObject(card)
    delegate.exchangeListCards = CardSet.allObjects as! [CardModel]
}

My Problem:

When I deleted the cell through sliding the cell to the left, the complier thrown the bug:

fatal error: Array index out of range

enter image description here

I blocked up here all the noon.

Hint: You removed the data from array, but your tableview doesn't know that. You need to inform your tableview about the dataset change.!!! — Midhun MP
– Midhun MP, Commented May 4, 2015 at 9:49
@MidhunMP I'm dealing with a similar error, how do you inform the tableview of the change? I have used self.reloadData() in my code — SamYoungNY
– SamYoungNY, Commented Sep 4, 2015 at 14:59

Sunkas · Accepted Answer · 2015-05-04 10:01:18Z

7

You need to call

self.reloadData()

in your UITableViewController each time you modify your data source.

answered May 4, 2015 at 10:01

Sunkas

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2 Comments

Yichen Zhou Over a year ago

Thank you very much. Bug went away when I added self.reloadData( ).

Midhun MP Over a year ago

@EthanJoe: I won't recommend this. Reloading entire tableview is not a good practice. You can use deleteRowAtIndexPaths method instead. Check this tutorial ioscreator.com/tutorials/delete-rows-from-tableview

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