CW-352 add enable disable screenshot feature to i os (#931)

* Disable ios screen recording

* Minor Enhancements

---------

Co-authored-by: OmarHatem <omarh.ismail1@gmail.com>

cw_core/lib/set_app_secure_native.dart

@@ -2,5 +2,6 @@ import 'package:flutter/services.dart';
 
 const utils = const MethodChannel('com.cake_wallet/native_utils');
 
-void setIsAppSecureNative(bool isAppSecure) =>
+void setIsAppSecureNative(bool isAppSecure) {
-    utils.invokeMethod<Uint8List>('setIsAppSecure', {'isAppSecure': isAppSecure});
+    utils.invokeMethod<Uint8List>('setIsAppSecure',  {'isAppSecure': isAppSecure});
+}

ios/Runner/AppDelegate.swift

@@ -15,6 +15,8 @@ import UnstoppableDomainsResolution
         if #available(iOS 10.0, *) {
           UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate
         }
+
+        makeSecure()
         
         let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
         let legacyMigrationChannel = FlutterMethodChannel(
@@ -96,22 +98,39 @@ import UnstoppableDomainsResolution
                     
                     result(address)
                 }
-
+            case "setIsAppSecure":
+                guard let args = call.arguments as? Dictionary<String, Bool>,
+                    let isAppSecure = args["isAppSecure"] else {
+                    result(nil)
+                    return
+                }
+                
+                if isAppSecure {
+                     self?.textField.isSecureTextEntry = true
+                } else {
+                    self?.textField.isSecureTextEntry = false
+                }
+                
+                result(nil)
             default:
                 result(FlutterMethodNotImplemented)
             }
         })
-        
+                
         GeneratedPluginRegistrant.register(with: self)
         return super.application(application, didFinishLaunchingWithOptions: launchOptions)
     }
+    
+    private var textField = UITextField()
+    
+    private func makeSecure() {
+        if (!self.window.subviews.contains(textField)) {
+            self.window.addSubview(textField)
+            textField.centerYAnchor.constraint(equalTo: self.window.centerYAnchor).isActive = true
+            textField.centerXAnchor.constraint(equalTo: self.window.centerXAnchor).isActive = true
+            self.window.layer.superlayer?.addSublayer(textField.layer)
+            textField.layer.sublayers?.first?.addSublayer(self.window.layer)
+        }
+    }
 
-    override func applicationWillResignActive(_: UIApplication ) {
-        self.window?.rootViewController?.view.endEditing(true)
-        self.window?.isHidden = true;
-      }
-
-      override func applicationDidBecomeActive(_: UIApplication) {
-        self.window?.isHidden = false;
-      }
 }

lib/src/screens/settings/privacy_page.dart

@@ -8,7 +8,6 @@ import 'package:cake_wallet/view_model/settings/choices_list_item.dart';
 import 'package:cake_wallet/view_model/settings/privacy_settings_view_model.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_mobx/flutter_mobx.dart';
-import 'dart:io' show Platform;
 
 class PrivacyPage extends BasePage {
   PrivacyPage(this._privacySettingsViewModel);
@@ -49,13 +48,12 @@ class PrivacyPage extends BasePage {
                 onValueChange: (BuildContext _, bool value) {
                   _privacySettingsViewModel.setShouldSaveRecipientAddress(value);
                 }),
-            if (Platform.isAndroid)
+            SettingsSwitcherCell(
-              SettingsSwitcherCell(
+                title: S.current.prevent_screenshots,
-                  title: S.current.prevent_screenshots,
+                value: _privacySettingsViewModel.isAppSecure,
-                  value: _privacySettingsViewModel.isAppSecure,
+                onValueChange: (BuildContext _, bool value) {
-                  onValueChange: (BuildContext _, bool value) {
+                  _privacySettingsViewModel.setIsAppSecure(value);
-                    _privacySettingsViewModel.setIsAppSecure(value);
+                }),
-                  }),
             SettingsSwitcherCell(
                 title: S.current.disable_buy,
                 value: _privacySettingsViewModel.disableBuy,

lib/store/settings_store.dart

@@ -23,7 +23,6 @@ import 'package:cake_wallet/monero/monero.dart';
 import 'package:cake_wallet/entities/action_list_display_mode.dart';
 import 'package:cake_wallet/entities/fiat_api_mode.dart';
 import 'package:cw_core/set_app_secure_native.dart';
-import 'dart:io' show Platform;
 
 part 'settings_store.g.dart';
 
@@ -136,11 +135,11 @@ abstract class SettingsStoreBase with Store {
         (bool shouldSaveRecipientAddress) => sharedPreferences.setBool(
             PreferencesKey.shouldSaveRecipientAddressKey, shouldSaveRecipientAddress));
 
+    setIsAppSecureNative(isAppSecure);
+
     reaction((_) => isAppSecure, (bool isAppSecure) {
       sharedPreferences.setBool(PreferencesKey.isAppSecureKey, isAppSecure);
-      if (Platform.isAndroid) {
         setIsAppSecureNative(isAppSecure);
-      }
     });
 
     reaction(
@@ -153,10 +152,6 @@ abstract class SettingsStoreBase with Store {
         (bool disableSell) => sharedPreferences.setBool(
             PreferencesKey.disableSellKey, disableSell));
 
-    if (Platform.isAndroid) {
-      setIsAppSecureNative(isAppSecure);
-    }
-
     reaction(
         (_) => fiatApiMode,
         (FiatApiMode mode) =>