使用绑定/演示模式从 SwiftUI 中关闭 UIViewController 表？

Question

我有一个 SwiftUI 视图，其中包含一个指向 UIViewControllerRepresentable 结构的工作表，该结构使用 Google Ad Manager 扩展。我希望 UIKit 扩展在使用演示模式运行完成后关闭该工作表，但通过环境使用演示模式不起作用。代码是否未按照我设置的方式运行，或者是否无法从 Google Ads Manager 中关闭该工作表？

或者，当我尝试使用 Binding 关闭工作表以更新 AdManager 中的 isPresented 时，我收到错误消息：“属性 'self.isPresented' 未在 super.init 调用中初始化”。然而，当我尝试初始化它时，它说我不能在 super.init 之前执行它，而当我将它放在 super.init 之后时，它说我不能在 super.init 之后调用它。广告加载完成后，有什么方法可以关闭该工作表（函数rewardedAdDidDismiss）？

编辑：这篇文章最初被标记为重复，但链接的问题询问如何从 UIViewController 中消除 SwiftUI 模式，而不是相反。

SwiftUI 视图：

    import SwiftUI

struct AdRevenue: View {
    @State var playAd = false
@Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>

var body: some View {
    Button(action: {
            self.playAd = true
                    })
            {
                Text("Play Ad")
            }.sheet(isPresented: $playAd) {
                Ads()}
}
}

这是我的 UIViewControllerRepresentable：

 import GoogleMobileAds
import SwiftUI
import UIKit

struct Ads: UIViewControllerRepresentable {

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>

override func viewDidLoad() {
super.viewDidLoad()

    AdManager.shared.loadAndShowRewardAd(AdIds.rewarded.rawValue, viewController: self)
    AdManager.shared.delegateReward = self
    presentationMode.wrappedValue.dismiss()

    }


    func rewardedAd(_ rewardedAd: GADRewardedAd, userDidEarn reward: GADAdReward) {
      print("Reward received: \(reward.type), amount \(reward.amount).")
    }

}
}

这是我的 Google 广告管理工具：

    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 rewardViewController:UIViewController?

private var testDevices:[String] = [""]

private var rewardedAd: GADRewardedAd?

@Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>

let borderSizeBetweenBannerAndContent:CGFloat = 5

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) {
    presentationMode.wrappedValue.dismiss()
    print("Rewarded ad dismissed.")
    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)
}
}