Error while passing data between two ViewControllers - ios

Question

I get the following error after passing data from one ViewController to another.
no data
eventStruct(title: What are we gonna do today?, date: 2017-07-13, location: House3, description: Hello beautiful people!)
2017-06-15 22:01:05.697 RUC-App 1.0[48760:5792168] Warning: Attempt to present <RUC_App_1_0.EventViewController: 0x7fb686636460> on <RUC_App_1_0.NewsfeedViewController: 0x7fb68662e6a0> whose view is not in the window hierarchy!
The code from the first ViewController:
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
class NewsfeedViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
var ref:DatabaseReference!,
posts = [eventStruct]()
#IBOutlet weak var tableview: UITableView!
var propertStruct : (Any)? = nil
override func viewDidLoad() {
super.viewDidLoad()
loadNews()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func loadNews() {
ref = Database.database().reference()
ref.child("events").queryOrderedByKey().observe(.childAdded, with: { (snapshot) in
if let valueDictionary = snapshot.value as? [AnyHashable:String]
{
let title = valueDictionary["Title"]
let location = valueDictionary["Location"]
let date = valueDictionary["Date"]
let description = valueDictionary["Description"]
self.posts.insert(eventStruct(title: title, date: date, location: location, description: description), at: 0)
self.tableview.reloadData()
}
})
}
///////////////////////// Table View Content \\\\\\\\\\\\\\\\\\\\\\\\\\
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let label1 = cell.viewWithTag(1) as! UILabel
label1.text = posts[indexPath.row].title
let label2 = cell.viewWithTag(2) as! UILabel
label2.text = posts[indexPath.row].location
let label3 = cell.viewWithTag(3) as! UILabel
label3.text = posts[indexPath.row].date
return cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "showDetails"){
let secondViewController = segue.destination as? EventViewController
secondViewController?.data = sender as? eventStruct
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "showDetails", sender: posts[indexPath.row])
}
/////////////////////////////////////\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
}
struct eventStruct {
let title: String!
let date: String!
let location: String!
let description: String!
}
The code of the second ViewController:
import UIKit
class EventViewController: UIViewController {
var data: eventStruct?
#IBOutlet weak var titleLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
print (data ?? "no data")
self.titleLabel.text = self.data?.title
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

You should not have both triggered and manual segues happening at the same time.
Try this:
Delete your didSelectRowAt function (or comment it out), and replace prepare() with:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (segue.identifier == "showDetails"){
let secondViewController = segue.destination as? EventViewController
if let idx = tableView.indexPathForSelectedRow {
secondViewController?.data = posts[idx.row]
}
}
}