When I try to make reloadData() I get a crash

Question

When I try to reload tableview I get an error like

libc++abi.dylib: terminating with uncaught exception of type NSException

My UITableViewController

class NewTableViewController: UITableViewController {

var videos = [Video]()
    {
    didSet {

            self.tableView.reloadData() //error here
    }
}
let URL = "https://api.vid.me/channel/1/new"

override func viewDidLoad() {
    super.viewDidLoad()

    let request = Alamofire.request(.GET, self.URL)
        request.responseObject { (response: Response<NewestVideos, NSError>) in

        switch response.result {
        case .Success(let newest):
            self.videos = newest.videos!
        case .Failure(let error):
            print("Request failed with error: \(error)")
        }
    }
}

override func didReceiveMemoryWarning() {super.didReceiveMemoryWarning()}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {return self.videos.count}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! NewTableViewCell
    let video = videos[indexPath.row]
    cell.newVideoNameLabel?.text = video.completeUrl != nil ? video.completeUrl! : "nil"
     return cell
     }
}

I think it's problem with threading? In my app I make a .get request and I get a value if I try to print in didSet like print(self.videos) I tried adding

dispatch_async(dispatch_get_main_queue()) {
   self.tableView.reloadData()
}

E-Riddie · Answer 1 · 2016-09-12T13:50:47.643

1

Make sure when you set videos, you are calling it in the Main Queue

You can protect videos when you set in on Main Queue:

dispatch_async(dispatch_get_main_queue()) {
   self.videos = newest.videos!
}

Or you can protect it under:

didSet {
    dispatch_async(dispatch_get_main_queue()) {
        self.tableView.reloadData()
    }
}

edited Sep 12 '16 at 13:50

answered Sep 12 '16 at 12:39

E-Riddie

14,660
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@DmitrievichR Not in get, because you want to reload the data when the var is set (didSet) – E-Riddie Sep 12 '16 at 13:48
oh not get{} i mean didSet{} but it does not matter i get crash now too when `var videos = [Video](){ didSet { dispatch_async(dispatch_get_main_queue()) { self.tableView.reloadData() } } }` – DmitrievichR Sep 12 '16 at 13:59
Then you can check the [jose920405's answer](http://stackoverflow.com/a/39450885/2664437) if you have set the outlet correctly. Check your IB – E-Riddie Sep 12 '16 at 14:01

score 1 · Accepted Answer · edited May 23 '17 at 12:32

1

The libc++abi.dylib: terminating with uncaught exception of type NSException error, happens from any ways.

Remove reference from outlet
Bad name in performSegueWithIdentifier
IBActions type.

Check this link for more info

edited May 23 '17 at 12:32

Community

1
1

answered Sep 12 '16 at 12:58

jose920405

7,982
6
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71

There's one more way this error can happen, for me it was when I overlooked something in this call `let cancelAction = UIAlertAction(title: nil, style: .Cancel) { action in ...` . Even that the `title` parameter is of type `String?` you should not use `nil` (when running Xcode 8 and Swift 2.3 legacy mode). Something is `nil` when in actually shouldn't be. Happy hunting. Since Xcode 8 this error message has been the most confusing to me. The working code for my example is to use an actual `String`: `let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { action in ...` – Andrej Sep 17 '16 at 16:14

When I try to make reloadData() I get a crash

2 Answers2