[SG 547] Mobile username generator iOS.Extension UI changes (#2140)

* [SG-547] - Added button to generate username when using iOS extension

* [SG-547] - Missing changes from last commit

* SG-547 - Added missing interface method

* SG-547 - Added token renovation for iOS.Extension flow

* SG-547 Replaced generate buttons for icons

* SG-547 Removed unnecessary validation

* SG-547 - Fixed PR comments

* SG 547 - Missing file from last commit

* SG-547 - Fixed PR comments

* SG-547 - Renamed method

src/Android/Services/DeviceActionService.cs

@@ -520,5 +520,11 @@ namespace Bit.Droid.Services
             intent.SetData(uri);
             Application.Context.StartActivity(intent);
         }
+
+        public void CloseExtensionPopUp()
+        {
+            // only used by iOS
+            throw new NotImplementedException();
+        }
     }
 }

src/App/Abstractions/IDeviceActionService.cs

@@ -37,5 +37,6 @@ namespace Bit.App.Abstractions
         Task OnAccountSwitchCompleteAsync();
         Task SetScreenCaptureAllowedAsync();
         void OpenAppSettings();
+        void CloseExtensionPopUp();
     }
 }

src/App/Pages/Generator/GeneratorPage.xaml

@@ -21,7 +21,7 @@
             <u:InverseBoolConverter x:Key="inverseBool" />
             <u:LocalizableEnumConverter x:Key="localizableEnum" />
             <xct:EnumToBoolConverter x:Key="enumToBool"/>
-            <ToolbarItem Text="{u:I18n Cancel}" Clicked="Close_Clicked" Order="Primary" Priority="-1"
+            <ToolbarItem Text="{u:I18n Cancel}" Command="{Binding CloseCommand}" Order="Primary" Priority="-1"
                          x:Name="_closeItem" x:Key="closeItem" />
             <ToolbarItem Text="{u:I18n Select}"
                      Clicked="Select_Clicked"

src/App/Pages/Generator/GeneratorPage.xaml.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Threading.Tasks;
+using Bit.App.Models;
 using Bit.App.Resources;
 using Bit.App.Styles;
 using Bit.Core.Abstractions;
@@ -18,11 +19,11 @@ namespace Bit.App.Pages
         private readonly Action<string> _selectAction;
         private readonly TabsPage _tabsPage;
 
-        public GeneratorPage(bool fromTabPage, Action<string> selectAction = null, TabsPage tabsPage = null, bool isUsernameGenerator = false, string emailWebsite = null, bool editMode = false)
+        public GeneratorPage(bool fromTabPage, Action<string> selectAction = null, TabsPage tabsPage = null, bool isUsernameGenerator = false, string emailWebsite = null, bool editMode = false, AppOptions appOptions = null)
         {
             _tabsPage = tabsPage;
             InitializeComponent();
-            _broadcasterService = ServiceContainer.Resolve<IBroadcasterService>("broadcasterService");
+            _broadcasterService = ServiceContainer.Resolve<IBroadcasterService>();
             _vm = BindingContext as GeneratorPageViewModel;
             _vm.Page = this;
             _fromTabPage = fromTabPage;
@@ -31,6 +32,7 @@ namespace Bit.App.Pages
             _vm.IsUsername = isUsernameGenerator;
             _vm.EmailWebsite = emailWebsite;
             _vm.EditMode = editMode;
+            _vm.IosExtension = appOptions?.IosExtension ?? false;
             var isIos = Device.RuntimePlatform == Device.iOS;
             if (selectAction != null)
             {
@@ -134,14 +136,6 @@ namespace Bit.App.Pages
             await _vm.SliderChangedAsync();
         }
 
-        private async void Close_Clicked(object sender, EventArgs e)
-        {
-            if (DoOnce())
-            {
-                await Navigation.PopModalAsync();
-            }
-        }
-
         public override async Task UpdateOnThemeChanged()
         {
             await base.UpdateOnThemeChanged();

src/App/Pages/Generator/GeneratorPageViewModel.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using System.Windows.Input;
+using Bit.App.Abstractions;
 using Bit.App.Resources;
 using Bit.App.Utilities;
 using Bit.Core;
@@ -21,6 +22,7 @@ namespace Bit.App.Pages
         private readonly IClipboardService _clipboardService;
         private readonly IUsernameGenerationService _usernameGenerationService;
         private readonly ITokenService _tokenService;
+        private readonly IDeviceActionService _deviceActionService;
         readonly LazyResolve<ILogger> _logger = new LazyResolve<ILogger>("logger");
 
         private PasswordGenerationOptions _options;
@@ -59,6 +61,7 @@ namespace Bit.App.Pages
             _clipboardService = ServiceContainer.Resolve<IClipboardService>();
             _usernameGenerationService = ServiceContainer.Resolve<IUsernameGenerationService>();
             _tokenService = ServiceContainer.Resolve<ITokenService>();
+            _deviceActionService = ServiceContainer.Resolve<IDeviceActionService>();
 
             PageTitle = AppResources.Generator;
             GeneratorTypeOptions = new List<GeneratorType> {
@@ -89,8 +92,9 @@ namespace Bit.App.Pages
             UsernameTypePromptHelpCommand = new Command(UsernameTypePromptHelp);
             RegenerateCommand = new AsyncCommand(RegenerateAsync, onException: ex => OnSubmitException(ex), allowsMultipleExecutions: false);
             RegenerateUsernameCommand = new AsyncCommand(RegenerateUsernameAsync, onException: ex => OnSubmitException(ex), allowsMultipleExecutions: false);
-            ToggleForwardedEmailHiddenValueCommand = new AsyncCommand(ToggleForwardedEmailHiddenValueAsync, onException: ex => OnSubmitException(ex), allowsMultipleExecutions: false);
+            ToggleForwardedEmailHiddenValueCommand = new AsyncCommand(ToggleForwardedEmailHiddenValueAsync, onException: ex => _logger.Value.Exception(ex), allowsMultipleExecutions: false);
-            CopyCommand = new AsyncCommand(CopyAsync, onException: ex => OnSubmitException(ex), allowsMultipleExecutions: false);
+            CopyCommand = new AsyncCommand(CopyAsync, onException: ex => _logger.Value.Exception(ex), allowsMultipleExecutions: false);
+            CloseCommand = new AsyncCommand(CloseAsync, onException: ex => _logger.Value.Exception(ex), allowsMultipleExecutions: false);
         }
 
         public List<GeneratorType> GeneratorTypeOptions { get; set; }
@@ -104,6 +108,7 @@ namespace Bit.App.Pages
         public ICommand RegenerateUsernameCommand { get; set; }
         public ICommand ToggleForwardedEmailHiddenValueCommand { get; set; }
         public ICommand CopyCommand { get; set; }
+        public ICommand CloseCommand { get; set; }
 
         public string Password
         {
@@ -140,6 +145,8 @@ namespace Bit.App.Pages
             set => SetProperty(ref _isUsername, value);
         }
 
+        public bool IosExtension { get; set; }
+
         public bool ShowTypePicker
         {
             get => _showTypePicker;
@@ -606,6 +613,7 @@ namespace Bit.App.Pages
             LoadFromOptions();
 
             _usernameOptions = await _usernameGenerationService.GetOptionsAsync();
+            await _tokenService.PrepareTokenForDecodingAsync();
             _usernameOptions.PlusAddressedEmail = _tokenService.GetEmail();
             _usernameOptions.EmailWebsite = EmailWebsite;
             _usernameOptions.CatchAllEmailType = _usernameOptions.PlusAddressedEmailType = string.IsNullOrWhiteSpace(EmailWebsite) || !EditMode ? UsernameEmailType.Random : UsernameEmailType.Website;
@@ -681,6 +689,7 @@ namespace Bit.App.Pages
                 return;
             }
 
+            _usernameOptions.EmailWebsite = EmailWebsite;
             await _usernameGenerationService.SaveOptionsAsync(_usernameOptions);
 
             if (regenerate && UsernameTypeSelected != UsernameType.ForwardedEmailAlias)
@@ -729,6 +738,18 @@ namespace Bit.App.Pages
             }
         }
 
+        public async Task CloseAsync()
+        {
+            if (IosExtension)
+            {
+                _deviceActionService.CloseExtensionPopUp();
+            }
+            else
+            {
+                await Page.Navigation.PopModalAsync();
+            }
+        }
+
         private void LoadFromOptions()
         {
             AllowAmbiguousChars = _options.AllowAmbiguousChar.GetValueOrDefault();
@@ -765,6 +786,7 @@ namespace Bit.App.Pages
             TriggerPropertyChanged(nameof(PlusAddressedEmail));
             TriggerPropertyChanged(nameof(GeneratorTypeSelected));
             TriggerPropertyChanged(nameof(UsernameTypeDescriptionLabel));
+            TriggerPropertyChanged(nameof(EmailWebsite));
         }
 
         private void SetOptions()

src/Core/Abstractions/ITokenService.cs

@@ -28,5 +28,6 @@ namespace Bit.Core.Abstractions
         Task SetTwoFactorTokenAsync(string token, string email);
         bool TokenNeedsRefresh(int minutes = 5);
         int TokenSecondsRemaining();
+        Task PrepareTokenForDecodingAsync();
     }
 }

src/Core/Services/TokenService.cs

@@ -44,6 +44,11 @@ namespace Bit.Core.Services
             return _accessTokenForDecoding;
         }
 
+        public async Task PrepareTokenForDecodingAsync()
+        {
+            _accessTokenForDecoding = await _stateService.GetAccessTokenAsync();
+        }
+
         public async Task SetRefreshTokenAsync(string refreshToken)
         {
             await _stateService.SetRefreshTokenAsync(refreshToken, await SkipTokenStorage());

src/iOS.Core/Controllers/BaseLockPasswordViewController.cs

@@ -5,7 +5,6 @@ using Bit.App.Models;
 using Bit.App.Pages;
 using Bit.App.Resources;
 using Bit.App.Utilities;
-using Bit.Core;
 using Bit.Core.Abstractions;
 using Bit.Core.Enums;
 using Bit.Core.Models.Domain;
@@ -55,7 +54,7 @@ namespace Bit.iOS.Core.Controllers
         public abstract Action Cancel { get; }
 
         public FormEntryTableViewCell MasterPasswordCell { get; set; } = new FormEntryTableViewCell(
-            AppResources.MasterPassword, useButton: true);
+            AppResources.MasterPassword, buttonsConfig: FormEntryTableViewCell.ButtonsConfig.One);
 
         public string BiometricIntegrityKey { get; set; }
 
@@ -161,13 +160,7 @@ namespace Bit.iOS.Core.Controllers
                 {
                     MasterPasswordCell.TextField.KeyboardType = UIKeyboardType.NumberPad;
                 }
-                MasterPasswordCell.Button.TitleLabel.Font = UIFont.FromName("bwi-font", 28f);
+                MasterPasswordCell.ConfigureToggleSecureTextCell();
-                MasterPasswordCell.Button.SetTitle(BitwardenIcons.Eye, UIControlState.Normal);
-                MasterPasswordCell.Button.TouchUpInside += (sender, e) =>
-                {
-                    MasterPasswordCell.TextField.SecureTextEntry = !MasterPasswordCell.TextField.SecureTextEntry;
-                    MasterPasswordCell.Button.SetTitle(MasterPasswordCell.TextField.SecureTextEntry ? BitwardenIcons.Eye : BitwardenIcons.EyeSlash, UIControlState.Normal);
-                };
             }
 
             if (TableView != null)

src/iOS.Core/Controllers/LockPasswordViewController.cs

@@ -14,7 +14,6 @@ using Bit.Core.Enums;
 using Bit.App.Pages;
 using Bit.App.Models;
 using Xamarin.Forms;
-using Bit.Core;
 
 namespace Bit.iOS.Core.Controllers
 {
@@ -52,7 +51,7 @@ namespace Bit.iOS.Core.Controllers
         public abstract Action Cancel { get; }
 
         public FormEntryTableViewCell MasterPasswordCell { get; set; } = new FormEntryTableViewCell(
-            AppResources.MasterPassword, useButton: true);
+            AppResources.MasterPassword, buttonsConfig: FormEntryTableViewCell.ButtonsConfig.One);
 
         public string BiometricIntegrityKey { get; set; }
 
@@ -155,12 +154,7 @@ namespace Bit.iOS.Core.Controllers
                 {
                     MasterPasswordCell.TextField.KeyboardType = UIKeyboardType.NumberPad;
                 }
-                MasterPasswordCell.Button.TitleLabel.Font = UIFont.FromName("bwi-font", 28f);
+                MasterPasswordCell.ConfigureToggleSecureTextCell();
-                MasterPasswordCell.Button.SetTitle(BitwardenIcons.Eye, UIControlState.Normal);
-                MasterPasswordCell.Button.TouchUpInside += (sender, e) => {
-                    MasterPasswordCell.TextField.SecureTextEntry = !MasterPasswordCell.TextField.SecureTextEntry;
-                    MasterPasswordCell.Button.SetTitle(MasterPasswordCell.TextField.SecureTextEntry ? BitwardenIcons.Eye : BitwardenIcons.EyeSlash, UIControlState.Normal);
-                };
             }
 
             TableView.RowHeight = UITableView.AutomaticDimension;

src/iOS.Core/Controllers/LoginAddViewController.cs

@@ -1,18 +1,23 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading.Tasks;
+using AuthenticationServices;
+using Bit.App.Models;
+using Bit.App.Pages;
 using Bit.App.Resources;
+using Bit.App.Utilities;
+using Bit.Core;
+using Bit.Core.Abstractions;
+using Bit.Core.Exceptions;
+using Bit.Core.Models.View;
+using Bit.Core.Utilities;
+using Bit.iOS.Core.Models;
+using Bit.iOS.Core.Utilities;
 using Bit.iOS.Core.Views;
 using Foundation;
 using UIKit;
-using Bit.iOS.Core.Utilities;
+using Xamarin.Forms;
-using Bit.iOS.Core.Models;
-using System.Threading.Tasks;
-using AuthenticationServices;
-using Bit.Core.Abstractions;
-using Bit.Core.Models.View;
-using Bit.Core.Utilities;
-using Bit.Core.Exceptions;
 
 namespace Bit.iOS.Core.Controllers
 {
@@ -29,10 +34,8 @@ namespace Bit.iOS.Core.Controllers
 
         public AppExtensionContext Context { get; set; }
         public FormEntryTableViewCell NameCell { get; set; } = new FormEntryTableViewCell(AppResources.Name);
-        public FormEntryTableViewCell UsernameCell { get; set; } = new FormEntryTableViewCell(AppResources.Username);
+        public FormEntryTableViewCell UsernameCell { get; set; } = new FormEntryTableViewCell(AppResources.Username, buttonsConfig: FormEntryTableViewCell.ButtonsConfig.One);
-        public FormEntryTableViewCell PasswordCell { get; set; } = new FormEntryTableViewCell(AppResources.Password);
+        public FormEntryTableViewCell PasswordCell { get; set; } = new FormEntryTableViewCell(AppResources.Password, buttonsConfig: FormEntryTableViewCell.ButtonsConfig.Two);
-        public UITableViewCell GeneratePasswordCell { get; set; } = new ExtendedUITableViewCell(
-            UITableViewCellStyle.Subtitle, "GeneratePasswordCell");
         public FormEntryTableViewCell UriCell { get; set; } = new FormEntryTableViewCell(AppResources.URI);
         public SwitchTableViewCell FavoriteCell { get; set; } = new SwitchTableViewCell(AppResources.Favorite);
         public FormEntryTableViewCell NotesCell { get; set; } = new FormEntryTableViewCell(
@@ -67,6 +70,12 @@ namespace Bit.iOS.Core.Controllers
             UsernameCell.TextField.AutocorrectionType = UITextAutocorrectionType.No;
             UsernameCell.TextField.SpellCheckingType = UITextSpellCheckingType.No;
             UsernameCell.TextField.ReturnKeyType = UIReturnKeyType.Next;
+            UsernameCell.Button.TitleLabel.Font = UIFont.FromName("bwi-font", 28f);
+            UsernameCell.Button.SetTitle(BitwardenIcons.Generate, UIControlState.Normal);
+            UsernameCell.Button.TouchUpInside += (sender, e) =>
+            {
+                LaunchUsernameGeneratorFlow();
+            };
             UsernameCell.TextField.ShouldReturn += (UITextField tf) =>
             {
                 PasswordCell.TextField.BecomeFirstResponder();
@@ -75,17 +84,20 @@ namespace Bit.iOS.Core.Controllers
 
             PasswordCell.TextField.SecureTextEntry = true;
             PasswordCell.TextField.ReturnKeyType = UIReturnKeyType.Next;
+            PasswordCell.Button.TitleLabel.Font = UIFont.FromName("bwi-font", 28f);
+            PasswordCell.Button.SetTitle(BitwardenIcons.Generate, UIControlState.Normal);
+            PasswordCell.Button.TouchUpInside += (sender, e) =>
+            {
+                PerformSegue("passwordGeneratorSegue", this);
+            };
+
+            PasswordCell.ConfigureToggleSecureTextCell(true);
             PasswordCell.TextField.ShouldReturn += (UITextField tf) =>
             {
                 UriCell.TextField.BecomeFirstResponder();
                 return true;
             };
 
-            GeneratePasswordCell.TextLabel.Text = AppResources.GeneratePassword;
-            GeneratePasswordCell.TextLabel.TextColor = GeneratePasswordCell.TextLabel.TintColor =
-                ThemeHelpers.TextColor;
-            GeneratePasswordCell.Accessory = UITableViewCellAccessory.DisclosureIndicator;
-
             UriCell.TextField.Text = Context?.UrlString ?? string.Empty;
             UriCell.TextField.KeyboardType = UIKeyboardType.Url;
             UriCell.TextField.ReturnKeyType = UIReturnKeyType.Next;
@@ -210,6 +222,26 @@ namespace Bit.iOS.Core.Controllers
                 AppResources.InternetConnectionRequiredMessage, AppResources.Ok);
         }
 
+        private void LaunchUsernameGeneratorFlow()
+        {
+            var appOptions = new AppOptions { IosExtension = true };
+            var app = new App.App(appOptions);
+
+            var generatorPage = new GeneratorPage(false, selectAction: async (username) =>
+            {
+                UsernameCell.TextField.Text = username;
+                DismissViewController(false, null);
+            }, isUsernameGenerator: true, emailWebsite: NameCell.TextField.Text, appOptions: appOptions);
+
+            ThemeManager.SetTheme(app.Resources);
+            ThemeManager.ApplyResourcesTo(generatorPage);
+
+            var navigationPage = new NavigationPage(generatorPage);
+            var generatorController = navigationPage.CreateViewController();
+            generatorController.ModalPresentationStyle = UIModalPresentationStyle.FullScreen;
+            PresentViewController(generatorController, true, null);
+        }
+
         public class TableSource : ExtendedUITableViewSource
         {
             private LoginAddViewController _controller;
@@ -235,10 +267,6 @@ namespace Bit.iOS.Core.Controllers
                     {
                         return _controller.PasswordCell;
                     }
-                    else if (indexPath.Row == 3)
-                    {
-                        return _controller.GeneratePasswordCell;
-                    }
                 }
                 else if (indexPath.Section == 1)
                 {
@@ -277,7 +305,7 @@ namespace Bit.iOS.Core.Controllers
             {
                 if (section == 0)
                 {
-                    return 4;
+                    return 3;
                 }
                 else if (section == 1)
                 {
@@ -317,11 +345,6 @@ namespace Bit.iOS.Core.Controllers
                 tableView.DeselectRow(indexPath, true);
                 tableView.EndEditing(true);
 
-                if (indexPath.Section == 0 && indexPath.Row == 3)
-                {
-                    _controller.PerformSegue("passwordGeneratorSegue", this);
-                }
-
                 var cell = tableView.CellAt(indexPath);
                 if (cell == null)
                 {

src/iOS.Core/Services/DeviceActionService.cs

@@ -379,5 +379,10 @@ namespace Bit.iOS.Core.Services
             var url = new NSUrl(UIApplication.OpenSettingsUrlString);
             UIApplication.SharedApplication.OpenUrl(url);
         }
+
+        public void CloseExtensionPopUp()
+        {
+            GetPresentedViewController().DismissViewController(true, null);
+        }
     }
 }

src/iOS.Core/Views/FormEntryTableViewCell.cs

@@ -1,7 +1,7 @@
-using Bit.iOS.Core.Controllers;
+using System;
+using Bit.Core;
+using Bit.iOS.Core.Controllers;
 using Bit.iOS.Core.Utilities;
-using System;
-using System.Drawing;
 using UIKit;
 
 namespace Bit.iOS.Core.Views
@@ -12,14 +12,14 @@ namespace Bit.iOS.Core.Views
         public UITextField TextField { get; set; }
         public UITextView TextView { get; set; }
         public UIButton Button { get; set; }
+        public UIButton SecondButton { get; set; }
         public event EventHandler ValueChanged;
 
-
         public FormEntryTableViewCell(
             string labelName = null,
             bool useTextView = false,
             nfloat? height = null,
-            bool useButton = false,
+            ButtonsConfig buttonsConfig = ButtonsConfig.None,
             bool useLabelAsPlaceholder = false,
             float leadingConstant = 15f)
             : base(UITableViewCellStyle.Default, nameof(FormEntryTableViewCell))
@@ -85,7 +85,6 @@ namespace Bit.iOS.Core.Views
                     ValueChanged?.Invoke(sender, e);
                 };
             }
-
             else
             {
                 TextField = new UITextField
@@ -110,9 +109,10 @@ namespace Bit.iOS.Core.Views
                 }
 
                 ContentView.Add(TextField);
+
                 ContentView.AddConstraints(new NSLayoutConstraint[] {
                     NSLayoutConstraint.Create(TextField, NSLayoutAttribute.Leading, NSLayoutRelation.Equal, ContentView, NSLayoutAttribute.Leading, 1f, leadingConstant),
-                    NSLayoutConstraint.Create(ContentView, NSLayoutAttribute.Trailing, NSLayoutRelation.Equal, TextField, NSLayoutAttribute.Trailing, 1f, useButton ? 55f : 15f),
+                    NSLayoutConstraint.Create(ContentView, NSLayoutAttribute.Trailing, NSLayoutRelation.Equal, TextField, NSLayoutAttribute.Trailing, 1f, GetTextFieldToContainerTrailingConstant(buttonsConfig)),
                     NSLayoutConstraint.Create(ContentView, NSLayoutAttribute.Bottom, NSLayoutRelation.Equal, TextField, NSLayoutAttribute.Bottom, 1f, 10f)
                 });
 
@@ -148,18 +148,9 @@ namespace Bit.iOS.Core.Views
                 });
             }
 
-            if (useButton)
+            if(buttonsConfig != ButtonsConfig.None)
             {
-                Button = new UIButton(UIButtonType.System);
+                AddButtons(buttonsConfig);
-                Button.Frame = ContentView.Bounds;
-                Button.TranslatesAutoresizingMaskIntoConstraints = false;
-                Button.SetTitleColor(ThemeHelpers.PrimaryColor, UIControlState.Normal);
-
-                ContentView.Add(Button);
-
-                ContentView.BottomAnchor.ConstraintEqualTo(Button.BottomAnchor, 10f).Active = true;
-                ContentView.TrailingAnchor.ConstraintEqualTo(Button.TrailingAnchor, 10f).Active = true;
-                Button.LeadingAnchor.ConstraintEqualTo(TextField.TrailingAnchor, 10f).Active = true;
             }
         }
 
@@ -174,5 +165,74 @@ namespace Bit.iOS.Core.Views
                 TextField.BecomeFirstResponder();
             }
         }
+
+        public void ConfigureToggleSecureTextCell(bool useSecondaryButton = false)
+        {
+            var button = useSecondaryButton ? SecondButton : Button;
+            button.TitleLabel.Font = UIFont.FromName("bwi-font", 28f);
+            button.SetTitle(BitwardenIcons.Eye, UIControlState.Normal);
+            button.TouchUpInside += (sender, e) =>
+            {
+                TextField.SecureTextEntry = !TextField.SecureTextEntry;
+                button.SetTitle(TextField.SecureTextEntry ? BitwardenIcons.Eye : BitwardenIcons.EyeSlash, UIControlState.Normal);
+            };
+        }
+
+        private void AddButtons(ButtonsConfig buttonsConfig)
+        {
+            Button = new UIButton(UIButtonType.System);
+            Button.TranslatesAutoresizingMaskIntoConstraints = false;
+            Button.SetTitleColor(ThemeHelpers.PrimaryColor, UIControlState.Normal);
+
+            ContentView.Add(Button);
+
+            ContentView.BottomAnchor.ConstraintEqualTo(Button.BottomAnchor, 10f).Active = true;
+
+            switch (buttonsConfig)
+            {
+                case ButtonsConfig.One:
+                    ContentView.AddConstraints(new NSLayoutConstraint[] {
+                        NSLayoutConstraint.Create(ContentView, NSLayoutAttribute.Trailing, NSLayoutRelation.Equal, Button, NSLayoutAttribute.Trailing, 1f, 10f),
+                        NSLayoutConstraint.Create(Button, NSLayoutAttribute.Leading, NSLayoutRelation.Equal, TextField, NSLayoutAttribute.Trailing, 1f, 10f)
+                    });
+                    break;
+                case ButtonsConfig.Two:
+                    SecondButton = new UIButton(UIButtonType.System);
+                    SecondButton.TranslatesAutoresizingMaskIntoConstraints = false;
+                    SecondButton.SetTitleColor(ThemeHelpers.PrimaryColor, UIControlState.Normal);
+
+                    ContentView.Add(SecondButton);
+
+                    ContentView.AddConstraints(new NSLayoutConstraint[] {
+                        NSLayoutConstraint.Create(ContentView, NSLayoutAttribute.Bottom, NSLayoutRelation.Equal, SecondButton, NSLayoutAttribute.Bottom, 1f, 10f),
+                        NSLayoutConstraint.Create(SecondButton, NSLayoutAttribute.Leading, NSLayoutRelation.Equal, TextField, NSLayoutAttribute.Trailing, 1f, 9f),
+                        NSLayoutConstraint.Create(Button, NSLayoutAttribute.Leading, NSLayoutRelation.Equal, SecondButton, NSLayoutAttribute.Trailing, 1f, 10f),
+                        NSLayoutConstraint.Create(ContentView, NSLayoutAttribute.Trailing, NSLayoutRelation.Equal, Button, NSLayoutAttribute.Trailing, 1f, 10f)
+                    });
+                    break;
+            }
+        }
+
+        private float GetTextFieldToContainerTrailingConstant(ButtonsConfig buttonsConfig)
+        {
+            switch (buttonsConfig)
+            {
+                case ButtonsConfig.None:
+                    return 15f;
+                case ButtonsConfig.One:
+                    return 55f;
+                case ButtonsConfig.Two:
+                    return 95f;
+                default:
+                    throw new ArgumentOutOfRangeException();
+            }
+        }
+
+        public enum ButtonsConfig : byte
+        {
+            None = 0,
+            One = 1,
+            Two = 2
+        }
     }
 }