Segue not performing swift - ios

Question

This is the code form the 'Opgeslagen Rooster' Viewcontroller
class vcSavedTimetable: UIViewController {
#IBOutlet weak var noTimetableSavedLabel: UILabel!
var timetable: Timetable!
override func viewWillAppear(_ animated: Bool) {
prepareView()
}
override func viewWillDisappear(_ animated: Bool) {
noTimetableSavedLabel.isHidden = true
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showSavedTimetable"{
let viewController = segue.destination as! vcTimetableShow
viewController.timetable = self.timetable
viewController.willSave = false
}
}
func prepareView(){
let savedTimetable = getTimetableFromUserDefaults()
guard (savedTimetable != nil) else {
noTimetableSavedLabel.isHidden = false
return
}
self.timetable = savedTimetable!
performSegue(withIdentifier: "showSavedTimetable", sender: nil)
}
func getTimetableFromUserDefaults()->Timetable?{
let timetableID = UserDefaults.standard.string(forKey: "savedTimetableID")
if isConnectedToNetwork(){
if let id = timetableID{
let table = Timetable(timetableID: id)
return table
}
}
let val = UserDefaults.standard.data(forKey: "savedTimetable")
if let data = val{
let table = NSKeyedUnarchiver.unarchiveObject(with: data) as! Timetable
return table
}
return nil
}
}
This is the code of the destination viewcontroller 'Rooster Bekijken'. The viewdidload() function should be executed, which doesn't happen. I tested it using breakpoints
//
// vcTimetableShowCollectionViewController.swift
// Ostrea Rooster App
//
// Created by Giel-Jan Looij on 14-12-16.
// Copyright © 2016 GJ-Computers. All rights reserved.
//
import UIKit
private let reuseIdentifier = "Cell"
class vcTimetableShow: UICollectionViewController, UICollectionViewDelegateFlowLayout {
weak var timetable: Timetable?
var willSave = false
//UIVIEWCONTROLLER
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.delegate = self
collectionView?.register( UINib(nibName: "timetableViewCell", bundle: nil), forCellWithReuseIdentifier: "lessonEntry")
NotificationCenter.default.addObserver(self, selector: #selector(self.dataDidArrive(_:)), name: .didFetchTimetable, object: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
deinit {
NotificationCenter.default.removeObserver(self)
}
//METHODES
func dataDidArrive(_ notification: NSNotification){
collectionView?.reloadData()
if let cv = self.collectionView {
cv.layoutIfNeeded()
let indexPath = IndexPath(item: 0, section: getDayOfWeek()-1)
if let attributes = cv.layoutAttributesForSupplementaryElement(ofKind: UICollectionElementKindSectionHeader, at: indexPath) {
let topOfHeader = CGPoint(x: 0, y: attributes.frame.origin.y - cv.contentInset.top)
cv.setContentOffset(topOfHeader, animated:true)
}
}
if willSave {
UserDefaults.standard.set(timetable!.timetableID, forKey: "savedTimetableID")
let encodedTimetable = NSKeyedArchiver.archivedData(withRootObject: self.timetable!)
UserDefaults.standard.set(encodedTimetable, forKey: "savedTimetable")
UserDefaults.standard.synchronize()
}
}
func getDayOfWeek()->Int {
let myCalendar = Calendar(identifier: .gregorian)
let weekDay = myCalendar.component(.weekday, from: Date())
if weekDay > 6 || weekDay < 2{
return 5
}
return weekDay-1
}
//UICOLLECTIONVIEW DATASOURCE
override func numberOfSections(in collectionView: UICollectionView) -> Int {
return timetable!.days.count
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return timetable!.days[section+1]!.hour.count * 2
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.item % 2 == 0{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "hourIndicator", for: indexPath)
let dayLabel = cell.viewWithTag(1) as! UILabel
let dayIndex = indexPath.section + 1
let hourIndex = indexPath.item/2 + 1
let cellHour = timetable!.days[dayIndex]!.hour[hourIndex]!
dayLabel.text = String(cellHour.hourID)
cell.layer.borderColor = UIColor.black.cgColor
cell.layer.borderWidth = 2
return cell
}else{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "lessonEntry", for: indexPath) as! timetableViewCell
let dayIndex = indexPath.section + 1
let hourIndex = indexPath.item/2 + 1
let cellHour = timetable!.days[dayIndex]!.hour[hourIndex]!
cell.cellHour = cellHour
cell.prepareCell()
return cell
}
}
override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
let cell = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "dayHeaderCell", for: indexPath as IndexPath)
let dayIndex = indexPath.section + 1
let dayName = timetable!.days[dayIndex]!.dayName
let day = cell.viewWithTag(1) as! UILabel
day.text = dayName
if timetable!.days[dayIndex]!.dayID == getDayOfWeek(){
cell.backgroundColor = UIColor.lightGray
}
return cell
}
//UICOLLECTIONVIEW DELEGATE
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if indexPath.item % 2 == 0{
let dayIndex = indexPath.section + 1
let hourIndex = indexPath.item/2 + 1
let cellHour = timetable!.days[dayIndex]!.hour[hourIndex]!
var cellHeight: CGFloat = 0
for _ in cellHour.lessons{
cellHeight += 23
}
if cellHour.notice != ""{
cellHeight += 23
}
return CGSize(width: 50, height: cellHeight)
}else{
let dayIndex = indexPath.section + 1
let hourIndex = indexPath.item/2 + 1
let cellHour = timetable!.days[dayIndex]!.hour[hourIndex]!
var cellHeight: CGFloat = 0
for _ in cellHour.lessons{
cellHeight += 23
}
if cellHour.notice != ""{
cellHeight += 23
}
return CGSize(width: 226.0, height: cellHeight)
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 1
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
let edgeInset: CGFloat = (collectionView.frame.width - (226.0 + 50.0))/2
return UIEdgeInsets.init(top: 0, left: edgeInset, bottom: 30, right: edgeInset)
}
}
I'm trying to segue from 'Opgeslagen Rooster' to 'Rooster Bekijken', but it doesn't work. It is running in the main thread (thread 1), so that isn't the problem. It gets to prepare(for segue...), does everything. After that the view should change right? But that doesn't happen. The viewdidload method of the 'Rooster Bekijken' ViewController doesn't get called. It hangs after the last line in the pepare(for segue ....) function.
Why doesn't it change to the other viewcontroller? It does work when im accessing the 'Rooster Bekijken' viewcontroller form the other viewcontroller which segue's to it.