I am trying to call a method from my view controller in my Scene.swift class - which I am able to do. The method is called after the touchesBegan method is called when I click on an SKLabel node, which are set up in my view controller.
The problem is that when I click on an SKLabelNode, control passes to the Scene.swift class and within the touchesBegan method, the method I want to call is called, so the control is passed back to the view controller, when I get back here it seems that all my variables are set to nil, as if its a completely different instance of the controller?
The error occurs in the checkIfValidTime method when I try to set the text property of a label in the ArViewController. - I highlighted these lines with **.
Error:
Fatal error: Unexpectedly found nil while unwrapping an Optional value
How do I reference the same instance of the view controller so that the variables don't reset when I declare it in the Scene.Swift? Or is there a way I can implement the touchesBegan method in the view controller so that I don't have to instantiate the ARViewController?
I would appreciate any help on this matter as I have been stuck for a while now on it and I am new to iOS and swift app design.
I have tried to limit the code to what is necessary for me to explain this problem. Any questions just ask. Thanks
ARViewController:
public var receivedCallback : Bool = false
class ARViewController: UIViewController, ARSKViewDelegate, URLSessionDelegate {
// MARK: - IBOutlets
@IBOutlet weak var sceneView: ARSKView!
@IBOutlet weak var guideLabel: UILabel!
@IBOutlet weak var testLbl: UILabel!
var scene : Scene?
static var dateToUse : Date?
var aRLocalDate : Date?
var button: SKSpriteNode?
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
/*
Start the view's AR session with a configuration that uses the rear camera,
device position and orientation tracking, and plane detection..
*/
let configuration = ARWorldTrackingConfiguration()
guard ARWorldTrackingConfiguration.isSupported else {
fatalError(""
ARKit is not available on this device."")
}
sceneView.session.run(configuration)
sceneView.delegate = self
if let scene = SKScene(fileNamed: "Scene"){
self.scene = scene as! Scene
sceneView.presentScene(self.scene)
} else {
print("Error: scene initalisation failed")
}
let overflow = ((aRLocalDate?.debugDescription.count)! - 11)
let endIndex = aRLocalDate?.debugDescription.index((aRLocalDate?.debugDescription.endIndex)!, offsetBy: -overflow)
if let truncatedDate = aRLocalDate?.debugDescription.substring(to: endIndex!){
DateLabel.text = truncatedDate
}
}
**/// - Tag: PlaceARContent**
func view(_ view : ARSKView, nodeFor anchor: ARAnchor) -> SKNode? {
if self.Generated == false{
self.guideLabel.alpha = 0
parentNode = SKShapeNode(rectOf: CGSize(width: 400, height: 720))
var count = 1;
for time in timesArray {
**//add a SKSpriteNode and assign image to it**
**let labelNode : SKLabelNode = SKLabelNode(text: time)**
labelNode.name = "booklabel" + String(count)
labelNode.isUserInteractionEnabled = false;
parentNode?.addChild(labelNode)
posy -= 60
count += 1
}
parentNode?.alpha = 0.6
self.Generated = true
drawEventNodes()
return parentNode
}
else {
return nil
}
}
//check if the booking is not in the past
func checkIfValidTime(bookingTime: String, startDateTimeDate: Date) -> Bool {
thisDate = ARViewController.dateToUse;
let date = Date()
let currentHour = Calendar.current.component(.hour, from: date)
if (startDateTimeDate > date) {
print("Start time is greater than the current date. = valid")
**self.guideLabel.text = "Test"**
return true;
}
else {
print("Start time is not valid - before current time")
**self.guideLabel.text = "Test"**
return false;
}
}
func doPost(bookingTime: String) {
print("Start of post method")
thisDate = ARViewController.dateToUse;
roomToBook = globalVariables.roomDictionary[globalVariables.userString]!
let name = globalVariables.userString;
let date = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let displayName = globalVariables.userString
let startDateStr = dateFormatter.string(from: thisDate!)
let startHourString = bookingTime
print("StartDateStr:", startDateStr)
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
let startDateTimeString = "\(startDateStr)T\(startHourString)"
let startDateTimeDate = dateFormatter.date(from: startDateTimeString)
let endDateTimeDate = startDateTimeDate?.addingTimeInterval(3600)//3600 = 1 hour
let endDateTimeString = dateFormatter.string(from: endDateTimeDate!)
print("Start Date Time String", startDateTimeString)
print("End date time string", endDateTimeString)
print ("room to book: ",roomToBook)
let valid = checkIfValidTime(bookingTime: bookingTime, startDateTimeDate: startDateTimeDate!)
if (valid == true) {
let jsonObject: [String: Any] =
[
"subject": "Booking",
"body":[
"contentType": "HTML",
"content": "Test Booking"
],
"start":[
"dateTime": startDateTimeString,
"timeZone": "UTC"
],
"end": [
"dateTime": endDateTimeString,
"timeZone": "UTC"
],
"location":[
"displayName": displayName
],
"attendees":[[
"emailAddress": [
"address": roomToBook,
"name": displayName
],
"type": "required"
]]
]
//let valid = JSONSerialization.isValidJSONObject(jsonObject) // true
let jsonData = try? JSONSerialization.data(withJSONObject: jsonObject)
// create post request
let url = URL(string: "https://graph.microsoft.com/v1.0/me/events")!
var request = URLRequest(url: url)
request.setValue("Bearer \(globalVariables.accessToken)", forHTTPHeaderField: "Authorization")
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Accept") // the expected response is also JSON
request.httpMethod = "POST"
// insert json data to the request
request.httpBody = jsonData
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
print(error?.localizedDescription ?? "No data")
return
}
let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
if let responseJSON = responseJSON as? [String: Any] {
print(responseJSON)
}
}
task.resume()
print("Post Done")
print("Refreshing now")
//code to refresh?
}
else {
print("Invalid booking time - it is in the past.")
}
}
Scene.Swift:
class Scene : SKScene{
var controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ARStoryBoard") as! ARViewController
// var controller: ARViewController!
var bookingTime : String?
override func touchesBegan(_ touches: Set<UITouch>, with event : UIEvent?) {
// var c = self.view?.window?.rootViewController as! ARViewController;
for touch in touches {
let location = touch.location(in: self)
let node : SKNode = self.atPoint(location)
let name = node.name
switch name {
case "booklabel1"?:
controller.doPost(bookingTime: "08:00:00")
case "booklabel2"?:
controller.doPost(bookingTime: "09:00:00")
case "booklabel3"?:
controller.doPost(bookingTime: "10:00:00")
case "booklabel4"?:
controller.doPost(bookingTime: "11:00:00")
case "booklabel5"?:
controller.doPost(bookingTime: "12:00:00")
case "booklabel6"?:
controller.doPost(bookingTime: "13:00:00")
case "booklabel7"?:
controller.doPost(bookingTime: "14:00:00")
case "booklabel8"?:
controller.doPost(bookingTime: "15:00:00")
case "booklabel9"?:
controller.doPost(bookingTime: "16:00:00")
case "booklabel10"?:
controller.doPost(bookingTime: "17:00:00")
case "booklabel11"?:
controller.doPost(bookingTime: "18:00:00")
default:
print ("No Specific Label Clicked")
}
}
}
}
Try This. (Check updated Edited answer: Highly recommended)
ARViewController: Create an instance outside the class
weak var arViewControllerInstance = ARViewController()
Make sure initialization inside ARViewController class:
override func viewDidLoad() {
super.viewDidLoad()
arViewControllerInstance = self
}
Now you can call in Scene.Swift using:
arViewControllerInstance?.doPost(bookingTime: "08:00:00")
Edited: Highly recommended
Above Method Simple but highly not recommended for best practice. Have a look below implementation using delegate protocol.
Create a protocol
protocol ScenceArViewControllerDelegate {
func doPost(bookingTime: String)
}
Add Above delegate in ARViewController class as below.
class ARViewController: UIViewController, ScenceArViewControllerDelegate{
func doPost(bookingTime: String){
//Funcion body goes here
}
}
Create a delegate variable inside the Scene class as below (Scene.swift)
class Scene: SKScene{
weak var delegateARVC: ScenceArViewControllerDelegate?
}
Once you implement above all. Now you have declared the delegateARVC variable from ARViewController as below code. (Note: You can use dependency injection for set value but below just sets object)
class ARViewController: UIViewController, ScenceArViewControllerDelegate{
var scene: Scene?
override func viewDidLoad() {
super.viewDidLoad()
scene = Scene()
scene.delegateARVC = self
}
func doPost(bookingTime: String){
//Funcion body goes here
}
}
Now all good. Now your Scene class knows it has a relationship reference with ARViewController by the method called doPost using ScenceArViewControllerDelegate.
You can call AARViewController 's doPost method as below from Scene class.
guard let delegateARCAvailable = delegateARVC else { return }
delegateARCAvailable.doPost(bookingTime: "08:00:00")
You can apply as you want. Thanks.