CODEWITHSUNDEEP
iosswift
stack_underflow
stack_underflow

Reputation: 53

Variable is empty inside of prepareforsegue function

I have data that I want to send to another view controller via a segue. I add some user selected data to an array in my first view controller inside of 'didselectrow' for a tableview, and in 'prepareforsegue' I attempt to set the first element of that array equal to a variable in my second view controller. However, I get an 'index out of range error' telling me that the array is empty, and I am not sure why.

Here is the first viewcontroller:

var selectedStores = [String]()

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        selectedStores.append(stores[indexPath.row])
        performSegue(withIdentifier: "showStoreDetailsSegue", sender: self)
    }

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        print("Prepare for segue called")
        if segue.identifier == "showStoreDetailsSegue" {
            let destinationVC = segue.destination as! StoreDetailsViewController

            destinationVC.selectedStore = selectedStores[0]
        }
    }

Second viewcontroller (StoreDetailsViewController):

var selectedStore = String()

I have another viewcontroller doing the exact same thing, but the array is not empty inside the prepareforsegue function. I have the tableview cell connected to the secondviewcontroller through a segue called "showStoreDetailsSegue".

Upvotes: 1

Views: 94

Answers (1)

matt
matt

Reputation: 536028

I have the tableview cell connected to the secondviewcontroller through a segue called "showStoreDetailsSegue".

That’s the problem. You are performing the segue twice, and the first time is before didSelect is called.

One solution: Connect the segue from the view controller, not the cell.

Alternatively (and better), delete your didSelect implementation itself. You don’t really need selectedStores. Just use prepare to find out what the selection is, and go from there.

Upvotes: 2

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