My mistake, heres how everything works.
The user will launch the app and will be met with the base "ViewController" From there they can either click startLivePressed or storeButtonPressed. If they click startLivePressed without ever going to the store there will not be a value in the onlineViewers label within the liveViewController. So they will click storeButtonPressed first.
language
class ViewController: UIViewController, SourceForB, SourceForC {
@IBOutlet weak var startLiveButton: UIButton!
var startLiveButtonIsSelected = false
@IBAction func startLivePressed(_ sender: UIButton) {
startLiveButtonIsSelected = !startLiveButtonIsSelected
performSegue(withIdentifier: "segueToCamera", sender: self)
}
@IBAction func storeButtonPressed(_ sender: UIButton) {
storeButtonIsSelected = !storeButtonIsSelected
performSegue(withIdentifier: "segueToStore", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
segue.prepare(sender:sender)
}
func prepare(for segue: UIStoryboardSegue, from sender: Any?, toC vc: liveViewController) {
}
func prepare(for segue: UIStoryboardSegue, from sender: Any?, toB vc: storeViewController) {
if (segue.identifier == "segueToStore") {
navigationController?.setNavigationBarHidden(navigationController?.isNavigationBarHidden == false, animated: true)
}
}
@IBAction func unwindToViewController(unwindSegue: UIStoryboardSegue){
print("unwind")
}
}
Once the user is in the storeViewController they will click viewersTapped which should store the value of senders current title. After they click that they will click the navigation bar back button which is viewWillDisappear to go back to the viewController.
language
protocol SourceForB {
func prepare(for segue: UIStoryboardSegue, from sender: Any?, toB vc: storeViewController)
}
protocol labelMaker {
func labelMaker(value: String)
}
class storeViewController: UIViewController {
var labelDelegate: labelMaker!
@IBAction func viewersTapped(_ sender: UIButton) {
labelDelegate.labelMaker(value: sender.currentTitle!)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
self.navigationController?.isNavigationBarHidden = false
}
}
extension storeViewController : SegueDestination{
func prepareAsDestination( segue: UIStoryboardSegue, sender: Any?){
let sourceForB = segue.source as! SourceForB
sourceForB.prepare(for: segue, from: sender, toB: self)
}
}
Once they are back in the viewController they will now click startLivePressed
language
class ViewController: UIViewController, SourceForB, SourceForC {
@IBOutlet weak var stopButton: UIButton!
@IBOutlet weak var startLiveButton: UIButton!
var startLiveButtonIsSelected = false
@IBAction func startLivePressed(_ sender: UIButton) {
startLiveButtonIsSelected = !startLiveButtonIsSelected
performSegue(withIdentifier: "segueToCamera", sender: self)
}
@IBAction func storeButtonPressed(_ sender: UIButton) {
storeButtonIsSelected = !storeButtonIsSelected
performSegue(withIdentifier: "segueToStore", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
segue.prepare(sender:sender)
}
func prepare(for segue: UIStoryboardSegue, from sender: Any?, toC vc: liveViewController) {
}
func prepare(for segue: UIStoryboardSegue, from sender: Any?, toB vc: storeViewController) {
if (segue.identifier == "segueToStore") {
navigationController?.setNavigationBarHidden(navigationController?.isNavigationBarHidden == false, animated: true)
}
}
@IBAction func unwindToViewController(unwindSegue: UIStoryboardSegue){
print("unwind")
}
}
After they clicked startLivePressed they will be met with the LiveViewController where the value that was stored in viewersTapped should be showing within the onlineViewers label. And if they were to leave the app and go back in and click startLivePressed the value should still be showing within the label. stopButton is a unwind button.
language
protocol SourceForC {
func prepare(for segue: UIStoryboardSegue, from sender: Any?, toC vc: liveViewController)
}
class liveViewController: UIViewController {
let storeView = storeViewController()
@IBOutlet weak var stopButton: UIButton!
@IBOutlet var onlineViewers: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
storeView.labelDelegate = self
}
}
extension liveViewController: labelMaker {
func labelMaker(value: String) {
onlineViewers.text = value
}
}
extension liveViewController : SegueDestination {
func prepareAsDestination( segue: UIStoryboardSegue, sender: Any?){
let sourceForC = segue.source as! SourceForC
sourceForC.prepare(for: segue, from: sender, toC: self)
}
}
Segue code in separate folder.
language
extension UIStoryboardSegue {
func prepare(sender : Any?) {
guard let destination = self.destination as? SegueDestination else{ fatalError("Destination \(self.destination) does not conform to SegueDestination protocol")}
destination.prepareAsDestination(segue: self, sender: sender)
}
}
extension UINavigationController : SegueDestination
{
func prepareAsDestination( segue: UIStoryboardSegue, sender: Any?){
guard let destination = self.topViewController as? SegueDestination
else{ fatalError("Top view contoroller must conform to protocol SegueDestination")}
destination.prepareAsDestination(segue: segue, sender: sender)
}
}
protocol SegueDestination
{
func prepareAsDestination( segue: UIStoryboardSegue, sender: Any?)
}
