Prepare for segue not passing data

I'm working on a Swift project using firebase and I have a UICollectionViewController that has all the categories, and I need to pass the category Id to the next view, but It passes an empty string

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let category = cnameArray[indexPath.row]
let catId = category.caId
func prepare(for segue: UIStoryboardSegue, sender: Any?){
if segue.identifier == "CatCity" {
let cityView = segue.destination as? CityViewController
cityView?.catId = catId!
} }
self.performSegue(withIdentifier: "CatCity", sender: self)

}


and in my CityViewController I have

var catId = String()


when I put a break point at the last line of the prepare func it gets hit and the console gets the value correctly while sitting a breakpoint at CityViewController gives me an empty var.
and I checked the code and my segue name and everything looks fine!

I dont think your prepare func should be inside the didselectIteAt.
– TheNitram
Jun 29 at 17:44

1 Answer
1

Correct setup

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let category = cnameArray[indexPath.row]
self.performSegue(withIdentifier: "CatCity", sender: category.caId)
}

func prepare(for segue: UIStoryboardSegue, sender: Any?){
if segue.identifier == "CatCity" {
if let cityView = segue.destination as? CityViewController {
cityView.catId = sender as! String
}
}
}


It's now working, thank you my dear.
– Sophie Bernard
Jun 29 at 18:27

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