Add workaround for failed payments on iOS 18.2

Sources/FoundationExtensions/UIApplication+RCExtensions.swift

@@ -11,16 +11,15 @@
 //
 //  Created by Andrés Boedo on 8/20/21.
 
-#if os(iOS) || VISION_OS
+#if os(iOS) || os(tvOS) || VISION_OS
 import UIKit
 
 extension UIApplication {
 
-    @available(iOS 13.0, macCatalyst 13.1, *)
+    @available(iOS 13.0, macCatalyst 13.1, tvOS 13.0, *)
     @available(macOS, unavailable)
     @available(watchOS, unavailable)
     @available(watchOSApplicationExtension, unavailable)
-    @available(tvOS, unavailable)
     @MainActor
     var currentWindowScene: UIWindowScene? {
         var scenes = self
@@ -38,6 +37,34 @@ extension UIApplication {
         return scenes.first as? UIWindowScene
     }
 
+    @available(iOS 15.0, tvOS 15.0, *)
+    var currentViewController: UIViewController? {
+        var rootViewController = currentWindowScene?.keyWindow?.rootViewController
+
+        if rootViewController == nil {
+            // Fallback for application extensions where scenes are not supported
+            rootViewController = (value(forKey: "keyWindow") as? UIWindow)?.rootViewController
+        }
+
+        guard let resolvedRootViewController = rootViewController else {
+            return nil
+        }
+
+        return getTopViewController(from: resolvedRootViewController)
+    }
+
+    private func getTopViewController(from viewController: UIViewController) -> UIViewController? {
+        if let presentedViewController = viewController.presentedViewController {
+            return getTopViewController(from: presentedViewController)
+        } else if let navigationController = viewController as? UINavigationController {
+            return navigationController.visibleViewController
+        } else if let tabBarController = viewController as? UITabBarController,
+                  let selected = tabBarController.selectedViewController {
+            return getTopViewController(from: selected)
+        }
+        return viewController
+    }
+
 }
 
 #endif

Sources/Misc/SystemInfo.swift

@@ -227,7 +227,7 @@ class SystemInfo {
 
 }
 
-#if os(iOS) || VISION_OS
+#if os(iOS) || os(tvOS) || VISION_OS
 extension SystemInfo {
 
     @available(iOS 13.0, macCatalystApplicationExtension 13.1, *)
@@ -244,6 +244,17 @@ extension SystemInfo {
         }
     }
 
+    @available(iOS 15.0, tvOS 15.0, *)
+    @MainActor
+    var currentViewController: UIViewController {
+        get throws {
+            let viewController = self.sharedUIApplication?.currentViewController
+
+            return try viewController
+                .orThrow(ErrorUtils.storeProblemError(withMessage: "Failed to get UIViewController"))
+        }
+    }
+
 }
 #endif
 

Sources/Purchasing/Purchases/PurchasesOrchestrator.swift

@@ -654,6 +654,22 @@ final class PurchasesOrchestrator {
         #if VISION_OS
         return try await product.purchase(confirmIn: try self.systemInfo.currentWindowScene,
                                           options: options)
+        #elseif (os(iOS) || os(tvOS)) && compiler(>=6.0.3)
+        // iOS 18.2 introduces a new `purchase(confirmIn:options:)` method which accepts a UIViewController
+        // This new method is present starting on Xcode 16.2 which bundles Swift 6.0.3.
+        // The old `purchase(options:)` method uses some heuristics to retrieve the rootViewController of the
+        // key window of the currerntly active scene.
+        // However, it is possible the rootViewController's view is currently removed from the view hieararchy.
+        // For example, if there is a view controller with `modalPresentationStyle = .fullScreen` being presented.
+        // This will prevent the payment sheet from appearing.
+        // To workaround this we traverse the view controller hierarchy to try to find the current top-most one.
+        if #available(iOS 18.2, tvOS 18.2, *),
+           let currentViewController = try? await self.systemInfo.currentViewController {
+            return try await product.purchase(confirmIn: currentViewController,
+                                              options: options)
+        } else {
+            return try await product.purchase(options: options)
+        }
         #else
         return try await product.purchase(options: options)
         #endif