Allow iOS to show launch image in app switcher

android/src/main/kotlin/org/jezequel/secure_application/SecureApplicationPlugin.kt

@@ -85,6 +85,12 @@ public class SecureApplicationPlugin: FlutterPlugin, MethodCallHandler, Activity
     } else if (call.method == "open") {
       activity?.window?.clearFlags(LayoutParams.FLAG_SECURE)
         result.success(true)
+    } else if (call.method == "useLaunchImage") {
+      // This is currently not possible on Android, as far as I am aware
+      result.success(true)
+    } else if (call.method == "backgroundColor") {
+      // This is currently not possible on Android, as far as I am aware
+      result.success(true)
     } else {
       result.success(true)
     }

ios/Classes/SwiftSecureApplicationPlugin.swift

@@ -4,7 +4,9 @@ import UIKit
 public class SwiftSecureApplicationPlugin: NSObject, FlutterPlugin {
     var secured = false;
     var opacity: CGFloat = 0.2;
-
+    var useLaunchImage: Bool = false;
+    var backgroundColor: UIColor = UIColor.white;
+
     var backgroundTask: UIBackgroundTaskIdentifier!
 
     internal let registrar: FlutterPluginRegistrar
@@ -28,29 +30,51 @@ public class SwiftSecureApplicationPlugin: NSObject, FlutterPlugin {
         if let window = UIApplication.shared.windows.filter({ (w) -> Bool in
                    return w.isHidden == false
         }).first {
-            if let existingView = window.viewWithTag(99699), let existingBlurrView = window.viewWithTag(99698) {
-                window.bringSubviewToFront(existingView)
-                window.bringSubviewToFront(existingBlurrView)
-                return
+            if (useLaunchImage) {
+                if let existingView = window.viewWithTag(99697) {
+                    window.bringSubviewToFront(existingView)
+                    return
+                } else {
+                    let imageView = UIImageView.init(frame: window.bounds)
+                    imageView.tag = 99697
+                    imageView.backgroundColor = backgroundColor
+                    imageView.clipsToBounds = true
+                    imageView.contentMode = .center
+                    imageView.image = UIImage(named: "LaunchImage")
+                    imageView.isMultipleTouchEnabled = true
+                    imageView.translatesAutoresizingMaskIntoConstraints = false
+
+                    window.addSubview(imageView)
+                    window.bringSubviewToFront(imageView)
+
+                    window.snapshotView(afterScreenUpdates: true)
+                    RunLoop.current.run(until: Date(timeIntervalSinceNow:0.5))
+                }
             } else {
-                let colorView = UIView(frame: window.bounds);
-                colorView.tag = 99699
-                colorView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
-                colorView.backgroundColor = UIColor(white: 1, alpha: opacity)
-                window.addSubview(colorView)
-                window.bringSubviewToFront(colorView)
-
-                let blurEffect = UIBlurEffect(style: UIBlurEffect.Style.extraLight)
-                let blurEffectView = UIVisualEffectView(effect: blurEffect)
-                blurEffectView.frame = window.bounds
-                blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
-
-                blurEffectView.tag = 99698
-
-                window.addSubview(blurEffectView)
-                window.bringSubviewToFront(blurEffectView)
-                window.snapshotView(afterScreenUpdates: true)
-                RunLoop.current.run(until: Date(timeIntervalSinceNow:0.5))
+                if let existingView = window.viewWithTag(99699), let existingBlurrView = window.viewWithTag(99698) {
+                    window.bringSubviewToFront(existingView)
+                    window.bringSubviewToFront(existingBlurrView)
+                    return
+                } else {
+                    let colorView = UIView(frame: window.bounds);
+                    colorView.tag = 99699
+                    colorView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+                    colorView.backgroundColor = backgroundColor.withAlphaComponent(opacity)
+                    window.addSubview(colorView)
+                    window.bringSubviewToFront(colorView)
+
+                    let blurEffect = UIBlurEffect(style: UIBlurEffect.Style.extraLight)
+                    let blurEffectView = UIVisualEffectView(effect: blurEffect)
+                    blurEffectView.frame = window.bounds
+                    blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+
+                    blurEffectView.tag = 99698
+
+                    window.addSubview(blurEffectView)
+                    window.bringSubviewToFront(blurEffectView)
+                    window.snapshotView(afterScreenUpdates: true)
+                    RunLoop.current.run(until: Date(timeIntervalSinceNow:0.5))
+                }
             }
         }
     self.endBackgroundTask()
@@ -72,30 +96,79 @@ public class SwiftSecureApplicationPlugin: NSObject, FlutterPlugin {
   public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
     if (call.method == "secure") {
         secured = true;
-        if let args = call.arguments as? Dictionary<String, Any>,
-        let opacity = args["opacity"] as? NSNumber {
-            self.opacity = opacity as! CGFloat
+        if let args = call.arguments as? Dictionary<String, Any> {
+            if let opacity = args["opacity"] as? NSNumber {
+                self.opacity = opacity as! CGFloat
+            }
+
+            if let useLaunchImage = args["useLaunchImage"] as? Bool {
+                self.useLaunchImage = useLaunchImage
+            }
+
+            if let backgroundColor = args["backgroundColor"] as? String {
+                self.backgroundColor = hexStringToUIColor(hex: backgroundColor)
+            }
         }
     } else if (call.method == "open") {
         secured = false;
-    }  else if (call.method == "opacity") {
-            if let args = call.arguments as? Dictionary<String, Any>,
-                  let opacity = args["opacity"] as? NSNumber {
-               self.opacity = opacity as! CGFloat
-           }
+    } else if (call.method == "opacity") {
+        if let args = call.arguments as? Dictionary<String, Any>,
+              let opacity = args["opacity"] as? NSNumber {
+           self.opacity = opacity as! CGFloat
+       }
+    } else if (call.method == "backgroundColor") {
+        if let args = call.arguments as? Dictionary<String, Any>,
+              let backgroundColor = args["backgroundColor"] as? String {
+           self.backgroundColor = hexStringToUIColor(hex: backgroundColor)
+       }
+    } else if (call.method == "useLaunchImage") {
+        if let args = call.arguments as? Dictionary<String, Any>,
+              let useLaunchImage = args["useLaunchImage"] as? Bool {
+           self.useLaunchImage = useLaunchImage
+       }
     } else if (call.method == "unlock") {
         if let window = UIApplication.shared.windows.filter({ (w) -> Bool in
                    return w.isHidden == false
-        }).first, let view = window.viewWithTag(99699), let blurrView = window.viewWithTag(99698) {
-            UIView.animate(withDuration: 0.5, animations: {
-                view.alpha = 0.0
-                blurrView.alpha = 0.0
-            }, completion: { finished in
-            view.removeFromSuperview()
-            blurrView.removeFromSuperview()
-
-            })
+        }).first {
+            if let colorView = window.viewWithTag(99699), let blurrView = window.viewWithTag(99698) {
+                UIView.animate(withDuration: 0.5, animations: {
+                    colorView.alpha = 0.0
+                }, completion: { finished in
+                    colorView.removeFromSuperview()
+                    blurrView.removeFromSuperview()
+                })
+            }
+
+            if let imageView = window.viewWithTag(99697) {
+                UIView.animate(withDuration: 0.3, animations: {
+                    imageView.alpha = 0.0
+                }, completion: { finished in
+                    imageView.removeFromSuperview()
+                })
+            }
         }
     }
   }
+
+  func hexStringToUIColor (hex:String) -> UIColor {
+      var cString:String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()
+
+      if (cString.hasPrefix("#")) {
+          cString.remove(at: cString.startIndex)
+      }
+
+      if ((cString.count) != 6) {
+          return UIColor.gray
+      }
+
+      var rgbValue:UInt64 = 0
+      Scanner(string: cString).scanHexInt64(&rgbValue)
+
+      return UIColor(
+          red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
+          green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
+          blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
+          alpha: CGFloat(1.0)
+      )
+  }
 }

lib/secure_application_native.dart

@@ -1,6 +1,6 @@
 import 'dart:async';
+import 'dart:ui';
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 
 class SecureApplicationNative {
@@ -45,4 +45,16 @@ class SecureApplicationNative {
   static Future opacity(double opacity) {
     return _channel.invokeMethod('opacity', {"opacity": opacity});
   }
+
+  static Future useLaunchImageIOS(bool useLaunchImage) {
+    return _channel.invokeMethod('useLaunchImage', {
+      'useLaunchImage': useLaunchImage,
+    });
+  }
+
+  static Future backgroundColor(Color color) {
+    return _channel.invokeMethod('backgroundColor', {
+      'backgroundColor': '#${color.value.toRadixString(16).substring(2, 8)}',
+    });
+  }
 }

lib/secure_gate.dart

@@ -1,9 +1,9 @@
 import 'dart:ui';
 
 import 'package:flutter/material.dart';
+import 'package:secure_application/secure_application_controller.dart';
 import 'package:secure_application/secure_application_native.dart';
 import 'package:secure_application/secure_application_provider.dart';
-import 'package:secure_application/secure_application_controller.dart';
 
 /// it will display a blurr over your content if locked
 ///
@@ -27,13 +27,30 @@ class SecureGate extends StatefulWidget {
   /// default to 0.6
   final double opacity;
 
+  /// Whether to use the application's LaunchImage in the app switcher.
+  ///
+  /// For this to work, you MUST have a LaunchImage ImageSet in your iOS folder,
+  /// just like a newly generated flutter application (at ios/Runner/Assets.xcassets/LaunchImage.imageset)
+  /// More info here: https://docs.flutter.dev/development/ui/advanced/splash-screen#ios-launch-screen
+  ///
+  /// If this is true, [opacity] and [blurr] are ignored (iOS only).
+  ///
+  /// Only available on iOS. It is not possible on Android, as far as I'm aware
+  final bool useLaunchImageIOS;
+
+  /// The background color in the app switcher.
+  final Color? backgroundColor;
+
   const SecureGate({
     Key? key,
     required this.child,
     this.blurr = 20,
     this.opacity = 0.6,
     this.lockedBuilder,
+    this.useLaunchImageIOS = false,
+    this.backgroundColor,
   }) : super(key: key);
+
   @override
   _SecureGateState createState() => _SecureGateState();
 }
@@ -50,6 +67,10 @@ class _SecureGateState extends State<SecureGate>
         AnimationController(vsync: this, duration: kThemeAnimationDuration * 2)
           ..addListener(_handleChange);
     SecureApplicationNative.opacity(widget.opacity);
+    SecureApplicationNative.useLaunchImageIOS(widget.useLaunchImageIOS);
+    if (widget.backgroundColor != null) {
+      SecureApplicationNative.backgroundColor(widget.backgroundColor!);
+    }
 
     super.initState();
   }
@@ -70,6 +91,13 @@ class _SecureGateState extends State<SecureGate>
     if (oldWidget.opacity != widget.opacity) {
       SecureApplicationNative.opacity(widget.opacity);
     }
+    if (oldWidget.useLaunchImageIOS != widget.useLaunchImageIOS) {
+      SecureApplicationNative.useLaunchImageIOS(widget.useLaunchImageIOS);
+    }
+    if (oldWidget.backgroundColor != widget.backgroundColor &&
+        widget.backgroundColor != null) {
+      SecureApplicationNative.backgroundColor(widget.backgroundColor!);
+    }
   }
 
   void _sercureNotified() {
@@ -108,7 +136,7 @@ class _SecureGateState extends State<SecureGate>
                   sigmaY: widget.blurr * _gateVisibility.value),
               child: Container(
                 decoration: BoxDecoration(
-                    color: Colors.grey.shade200
+                    color: (widget.backgroundColor ?? Colors.grey.shade200)
                         .withOpacity(widget.opacity * _gateVisibility.value)),
               ),
             ),