How can I access an SwiftUI environment object from an NSObject? - swift

Question

I'm trying to increment the variable adsWatched by 1 when an ad is dismissed by changing the environment object from a UIViewController and passing it to a SwiftUI view. I've tried putting an environment object in my NSObject class AdManager, which contains the function I want to change the environment object in, but I get the error message "Unknown attribute 'EnvironmentObject'":
public protocol AdManagerRewardDelegate{
func rewardAdGiveRewardToUser(type:String, amount: NSDecimalNumber)
func rewardAdFailedToLoad()
func rewardAdDidReceive(
rewardViewController: UIViewController?,
rewardedAd: GADRewardedAd?,
delegate: AdManager
)
func rewardAdDidOpen()
func rewardAdDidClose()
func rewardAdFailedToPresent()
}
//default implementation AdManagerRewardDelegate
public extension AdManagerRewardDelegate{
func rewardAdGiveRewardToUser(type:String, amount: NSDecimalNumber) {}
func rewardAdFailedToLoad() {}
func rewardAdDidReceive(
rewardViewController: UIViewController?,
rewardedAd: GADRewardedAd?,
delegate: AdManager
) {
if rewardedAd?.isReady == true {
if let rewardViewController = rewardViewController {
rewardedAd?.present(fromRootViewController: rewardViewController, delegate: delegate)
}
}
}
func rewardAdDidOpen() {}
func rewardAdDidClose() {}
func rewardAdFailedToPresent() {}
}
public class AdManager: NSObject {
public static let shared = AdManager()
public var ADS_DISABLED = false
public var delegateReward: AdManagerRewardDelegate?
private var viewController:UIViewController?
private var bannerViewContainer:UIView?
private var rewardViewController:UIViewController?
var interestial:GADInterstitial?
private var testDevices:[String] = [""]
private var rewardedAd: GADRewardedAd?
let borderSizeBetweenBannerAndContent:CGFloat = 5
#EnvironmentObject var settings: UserSettings
public override init() {
super.init()
}
public func configureWithApp(){
GADMobileAds.sharedInstance().requestConfiguration.testDeviceIdentifiers = testDevices
}
public func setTestDevics(testDevices: [String]){
self.testDevices = testDevices
self.testDevices += [kGADSimulatorID as! String ] //all simulator
}
private func getGADRequest() -> GADRequest{
let request = GADRequest()
return request
}
// MARK:- Reward Video Ads
public func loadAndShowRewardAd(_ adUnit: String, viewController: UIViewController){
self.rewardViewController = viewController
rewardedAd = GADRewardedAd(adUnitID: adUnit)
rewardedAd?.load(getGADRequest()) { error in
if let error = error {
// Handle ad failed to load case.
print("Reward based video ad failed to load. \(error.debugDescription)")
self.delegateReward?.rewardAdFailedToLoad()
} else {
// Ad successfully loaded.
print("Reward based video ad is received.")
self.delegateReward?.rewardAdDidReceive(
rewardViewController: self.rewardViewController,
rewardedAd: self.rewardedAd,
delegate: self
)
}
}
}
}
// MARK:- GADRewardBasedVideoAdDelegate
extension AdManager : GADRewardedAdDelegate {
public func rewardedAdDidPresent(_ rewardedAd: GADRewardedAd) {
print("Rewarded ad presented.")
delegateReward?.rewardAdDidOpen()
}
public func rewardedAd(_ rewardedAd: GADRewardedAd, didFailToPresentWithError error: Error) {
print("Rewarded ad failed to present.")
delegateReward?.rewardAdFailedToPresent()
}
public func rewardedAdDidDismiss(_ rewardedAd: GADRewardedAd) {
print("Rewarded ad dismissed.")
// i want to increase adsWatched by 1 here
settings.adsWatched += 1
delegateReward?.rewardAdDidClose()
}
public func rewardedAd(_ rewardedAd: GADRewardedAd, userDidEarn reward: GADAdReward) {
print("Reward received with currency: \(reward.type), amount \(reward.amount).")
delegateReward?.rewardAdGiveRewardToUser(type: reward.type, amount: reward.amount)
}
}
I've tried passing the object to it from my view controller, but I get the error message: "Instance member 'environmentObject' of type 'View' cannot be used on instance of nested type 'Ads.ViewController'" for this:
struct Ads: UIViewControllerRepresentable {
#EnvironmentObject var settings: UserSettings
#Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
typealias UIViewControllerType = UIViewController
func makeUIViewController(context: Context) -> UIViewController {
return ViewController()
}
func updateUIViewController(_ uiView: UIViewController, context: Context) {
}
class ViewController: UIViewController, GADRewardedAdDelegate, AdManagerRewardDelegate {
var rewardedAd: GADRewardedAd?
#Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
#EnvironmentObject var settings: UserSettings
override func viewDidLoad() {
super.viewDidLoad()
AdManager.shared.loadAndShowRewardAd(AdIds.rewarded.rawValue, viewController: self, environmentObject(settings))
// error messages here^: "Extra argument in call","Instance member 'environmentObject' of type 'View' cannot be used on instance of nested type 'Ads.ViewController'"
AdManager.shared.delegateReward = self
}
func rewardedAd(_ rewardedAd: GADRewardedAd, userDidEarn reward: GADAdReward) {
print("Reward received: \(reward.type), amount \(reward.amount).")
}
}
}
Is there any way I can change the variable from an NSObject?

Answer 1

The settings here is just a reference so you can pass it via arguments
public func loadAndShowRewardAd(_ adUnit: String, viewController: UIViewController,
settings: UserSettings) {
self.rewardViewController = viewController
// ... other code
}
and in your representable
struct Ads: UIViewControllerRepresentable {
#EnvironmentObject var settings: UserSettings
#Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
typealias UIViewControllerType = UIViewController
func makeUIViewController(context: Context) -> UIViewController {
return ViewController(settings: settings, mode: presentationMode)
}
func updateUIViewController(_ uiView: UIViewController, context: Context) {
}
class ViewController: UIViewController, GADRewardedAdDelegate, AdManagerRewardDelegate {
var rewardedAd: GADRewardedAd?
var presentationMode: Binding<PresentationMode>
var settings: UserSettings
init(settings: UserSettings, mode: Binding<PresentationMode>) {
self.settings = settings
self.presentationMode = mode
}
override func viewDidLoad() {
super.viewDidLoad()
AdManager.shared.loadAndShowRewardAd(AdIds.rewarded.rawValue, viewController: self, settings: settings)
// error messages here^: "Extra argument in call","Instance member 'environmentObject' of type 'View' cannot be used on instance of nested type 'Ads.ViewController'"
AdManager.shared.delegateReward = self
}
func rewardedAd(_ rewardedAd: GADRewardedAd, userDidEarn reward: GADAdReward) {
print("Reward received: \(reward.type), amount \(reward.amount).")
}
}
}