passing CoreData from UITableViewCell to viewcontroller - swift

Question

I'm trying to create the feature where when a user clicks on a specific cell in my UITableView, the Project will segue to a new ViewController and show all the information that has been saved in the CoreData. The Problem is that when I touch on a cell I get an error of
Unexpected nil while unwrapping optional value
Here is my code as it is right now within the ViewController that has the TableView
class ContactViewController: UIViewController, UITableViewDataSource, NSFetchedResultsControllerDelegate, UITableViewDelegate {
var selectName:String?
var selectPhone:String?
var selectComment:String?
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
selectName = contact[indexPath.row].name
selectPhone = contact[indexPath.row].phone
selectComment = contact[indexPath.row].comments
performSegue(withIdentifier: "MySegue", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "MySegue"{
if let destVC = segue.destination as? IndiViewController {
destVC.NameLabel = selectName
destVC.PhoneLabel = selectPhone
destVC.CommentLabel = selectComment
}
}
}
This is my code in IndiViewController (the VC in which I want the user to view the contact)
class IndiViewController: UIViewController {
#IBOutlet var NameLabel: UILabel!
#IBOutlet var PhoneLabel: UILabel!
#IBOutlet var CommentsLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
}
I've tried a few other methods but all still delivered the same error
I troubleshooted a bit to see which variable truly was causing the nil by doing this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "MySegue"{
if let destVC = segue.destination as? IndiViewController {
destVC.NameLabel = "selectName" //I thought if perhaps the nil was the var selectName this would at least let me know
}
}
However even through this, the app crashes and gives the same error. So I think the issue is with the Labels in the IndiViewController.
So I tried creating an empty String and assigning it to NameLabel like this:
class IndiViewController: UIViewController {
#IBOutlet var NameLabel: UILabel!
var name = ""
override func viewDidLoad() {
super.viewDidLoad()
NameLabel.text = name
}
}
but still no luck.
What am I doing wrong?

Answer 1

Yet it can be an IBOutlet error, even for typo.
delete #IBOutlet var NameLabel: UILabel!
remove the link in the StoryBoard "referencing outlets" tab
click-drag a new outlet for the UILabel and do not name it with a capital letter
// #IBOutlet var NameLabel: UILabel!
#IBOutlet var nameLabel: UILabel!
Edit
Also try to pass your informations in two times :
create a new var in your destinationViewController like :
class IndiViewController: UIViewController {
#IBOutlet var nameLabel: UILabel!
var myText: String = ""
override func viewDidLoad() {
super.viewDidLoad()
nameLabel.text = myText // assign the var to the labels text
}
}
In your prepareForSegue method assign myText and not the nameLabel.text
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "MySegue"{
if let destVC = segue.destination as? IndiViewController {
destVC.myText = "selectName"
}
}
}
my guess is that you cant acces IBOutlets in prepare(for segue:) method. The destination ViewController is not built yet