swift - 如何从 NSObject 访问 SwiftUI 环境对象?
问题描述
当通过从 UIViewController 更改环境对象并将其传递给 SwiftUI 视图来解除广告时,我试图将变量 adsWatched 增加 1。我尝试在我的 NSObject 类 AdManager 中放置一个环境对象,其中包含我想要更改环境对象的函数,但我收到错误消息“未知属性 '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)
}
}
我尝试将对象从我的视图控制器传递给它,但我收到错误消息:“实例成员 'view' 类型的 'environmentObject' 不能用于嵌套类型 'Ads.ViewController' 的实例”:
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).")
}
}
}
有什么办法可以从 NSObject 更改变量?
解决方案
这里settings
只是一个参考,因此您可以通过参数传递它
public func loadAndShowRewardAd(_ adUnit: String, viewController: UIViewController,
settings: UserSettings) {
self.rewardViewController = viewController
// ... other code
}
在你的代表
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).")
}
}
}
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