EXC_BAD_INSTRUCTION When Passing UICollectionView Cell Data to Different ViewController

Question

I have a UICollectionView that I am populating based on Firebase data. I have created custom cells that populate the UICollectionView:

import UIKit
import Ma         


        

Answer 1

The crash occurs because the outlet passLabel is not connected yet when prepare(for segue is called.

You have to declare a (temporary) variable in PollController and set the label in viewDidLoad

class PollController: UIViewController {

    @IBOutlet weak var passLabel: UILabel!

    var pass = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        passLabel.text = pass
    }

...

In prepare(for segue set the variable rather than the text property of the label:

let pollViewController = segue.destination as! PollController
    if let cell = sender as? PollCell {
        pollViewController.pass = cell.pollQuestion.text
    }
}

Note: It's not recommended to gather information from the view (cell). Get the index path and read the information from the model (data source array).