add foreground/background events to privacy plugin

ios/Plugin/PrivacyScreen.swift

@@ -9,7 +9,8 @@ import UIKit
     private var isEnabled = false
     private var window: UIWindow?
     private var screenPrevent = UITextField()
-
+    private var privacyProtectionWindow: UIWindow?
+
     init(plugin: PrivacyScreenPlugin, config: PrivacyScreenConfig, window: UIWindow?) {
         self.plugin = plugin
         self.config = config
@@ -59,10 +60,32 @@ import UIKit
         }
     }
 
-    @objc public func handleWillResignActiveNotification() {
+    private func showPrivacyProtectionWindow() {
+        guard let windowScene = self.window?.windowScene else {
+            return
+        }
+
+        self.privacyProtectionWindow = UIWindow(windowScene: windowScene)
+        self.privacyProtectionWindow?.rootViewController = self.privacyViewController
+        self.privacyProtectionWindow?.windowLevel = .alert + 1
+        self.privacyProtectionWindow?.makeKeyAndVisible()
+    }
+
+    private func hidePrivacyProtectionWindow() {
+        self.privacyProtectionWindow?.isHidden = true
+        self.privacyProtectionWindow = nil
+    }
+
+    @objc public func showPrivacyController() {
         guard self.isEnabled else {
             return
         }
+
+        if(self.config.foregroundBackgroundEvent ?? false) {
+            self.showPrivacyProtectionWindow()
+            return;
+        }
+
         DispatchQueue.main.async {
             let window = UIApplication.shared.connectedScenes
                 .filter({$0.activationState == .foregroundActive || $0.activationState == .foregroundInactive})
@@ -81,8 +104,14 @@ import UIKit
             }
         }
     }
+
 
-    @objc public func handleDidBecomeActiveNotification() {
+
+    @objc public func hidePrivacyController() {
+        if(self.config.foregroundBackgroundEvent ?? false) {
+            self.hidePrivacyProtectionWindow()
+            return;
+        }
         DispatchQueue.main.async {
             self.privacyViewController.dismiss(animated: false, completion: nil)
         }

ios/Plugin/PrivacyScreenConfig.swift

@@ -1,8 +1,9 @@
 import Foundation
 
 public struct PrivacyScreenConfig {
-    var enable = true
+    var enable: Bool = true
     var imageName: String? = ""
     var contentMode: String? = "center"
     var preventScreenshots: Bool? = true
+    var foregroundBackgroundEvent: Bool? = false
 }

ios/Plugin/PrivacyScreenPlugin.swift

@@ -12,11 +12,22 @@ public class PrivacyScreenPlugin: CAPPlugin {
     override public func load() {
         let config = getPrivacyScreenConfig()
         self.implementation = PrivacyScreen(plugin: self, config: config, window: UIApplication.shared.delegate?.window as? UIWindow)
+
+        if(config.foregroundBackgroundEvent ?? false) {
+            NotificationCenter.default.addObserver(self, selector: #selector(self.handleWillEnterForegroundNotification),
+                                                   name: UIScene.willEnterForegroundNotification, object: nil)
+            NotificationCenter.default.addObserver(self, selector: #selector(self.handleDidEnterBackgroundNotification),
+                                                   name: UIScene.didEnterBackgroundNotification, object: nil)
 
-        NotificationCenter.default.addObserver(self, selector: #selector(self.handleDidBecomeActiveNotification),
-                                               name: UIApplication.didBecomeActiveNotification, object: nil)
-        NotificationCenter.default.addObserver(self, selector: #selector(self.handleWillResignActiveNotification),
-                                               name: UIApplication.willResignActiveNotification, object: nil)
+        } else {
+            NotificationCenter.default.addObserver(self, selector: #selector(self.handleDidBecomeActiveNotification),
+                                                   name: UIApplication.didBecomeActiveNotification, object: nil)
+            NotificationCenter.default.addObserver(self, selector: #selector(self.handleWillResignActiveNotification),
+                                                   name: UIApplication.willResignActiveNotification, object: nil)
+        }
+
+
+
         NotificationCenter.default.addObserver(self, selector: #selector(self.handleCapturedDidChangeNotification),
                                                name: UIScreen.capturedDidChangeNotification, object: nil)
         NotificationCenter.default.addObserver(self, selector: #selector(self.handleUserDidTakeScreenshotNotification),
@@ -40,13 +51,20 @@ public class PrivacyScreenPlugin: CAPPlugin {
             call.resolve()
         })
     }
-
+
+    @objc private func handleDidBecomeActiveNotification() {
+        implementation?.hidePrivacyController()
+    }
+
     @objc private func handleWillResignActiveNotification() {
-        implementation?.handleWillResignActiveNotification()
+        implementation?.showPrivacyController()
     }
 
-    @objc private func handleDidBecomeActiveNotification() {
-        implementation?.handleDidBecomeActiveNotification()
+    @objc private func handleWillEnterForegroundNotification() {
+        implementation?.hidePrivacyController()
+    }
+    @objc private func handleDidEnterBackgroundNotification() {
+        implementation?.showPrivacyController()
     }
 
     @objc private func handleCapturedDidChangeNotification() {
@@ -71,6 +89,7 @@ public class PrivacyScreenPlugin: CAPPlugin {
         config.imageName = getConfig().getString("imageName", config.imageName)
         config.contentMode = getConfig().getString("contentMode", config.contentMode)
         config.preventScreenshots = getConfig().getBoolean("preventScreenshots", true)
+        config.foregroundBackgroundEvent = getConfig().getBoolean("foregroundBackgroundEvent", false)
         return config
     }
-}
+}

src/definitions.ts

@@ -50,6 +50,18 @@ declare module '@capacitor/cli' {
        * @since 5.2.0
        */
       preventScreenshots?: boolean;
+      /**
+       * Configure whether the plugin should use Foreground/Background events [UIScene for iOS 13+) for triggering.
+       *
+       * Only available for iOS.
+       *
+       * @default false
+       * @example false
+       * @since 5.2.0
+       * @see https://developer.apple.com/documentation/uikit/uiscene/3197922-didenterbackgroundnotification
+       * @see https://developer.apple.com/documentation/uikit/uiscene/3197925-willenterforegroundnotification/
+       */
+      foregroundBackgroundEvent?: boolean;
     };
   }
 }