Building User Authentication Interfaces in .NET MAUI: Login, Register, OTP Verification, and Forgot Password

Building User Authentication Interfaces in .NET MAUI: Login, Register, OTP Verification, and Forgot Password
Building User Authentication Interfaces in .NET MAUI: Login, Register, OTP Verification, and Forgot Password

 In this blog post, we will explore how to create user authentication interfaces using .NET MAUI (Multi-platform App UI), a framework for building cross-platform applications. We will focus on four essential screens: Login, Register, OTP Verification, and Forgot Password. By the end of this tutorial, you will have a solid foundation for creating secure and user-friendly authentication flows in your .NET MAUI applications.

Prerequisites:

To follow along with this tutorial, you should have a basic understanding of .NET MAUI and C#. You will also need the .NET MAUI development environment set up on your machine.

Before starting with the UI first install nugget "CommunityToolkit.Maui" in your MAUI project.

Then initialize in MauiProgram.cs file

    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder
            .UseMauiCommunityToolkit()
            .UseMauiApp<App>()
            .ConfigureFonts(fonts =>
            {
                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
                fonts.AddFont("FontAwesome5FreeSolid900.otf", "FontAwesomeFreeSolid");
            });
        Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping(nameof(Entry), (handler, view) =>
        {
#if ANDROID
            handler.PlatformView.SetBackgroundColor(Android.Graphics.Color.Transparent);
#elif IOS
            handler.PlatformView.BackgroundColor = UIKit.UIColor.Clear; 
            handler.PlatformView.BorderStyle = UIKit.UITextBorderStyle.None;
#endif
        });

#if DEBUG
        builder.Logging.AddDebug();
#endif

        return builder.Build();
    }

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Add some resource in resourcedictionary tag in app.xaml

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
            </ResourceDictionary.MergedDictionaries>
            <Color x:Key="Primary">#0D1C2E</Color>
            <Color x:Key="PlaceholderColor">#E5E5E5</Color>
            <Color x:Key="GrayColor">#ABB0B3</Color>
            <Color x:Key="Secondary">white</Color>
            <x:Double x:Key="FiftyFontSize">50</x:Double>
            <x:String x:Key="FontAwesomeFamily">FontAwesomeFreeSolid</x:String>
        </ResourceDictionary>
    </Application.Resources>

HeaderTexbox - Custom Control

    <ContentView xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Ecommerce.UI.Template.CustomControls.HeaderTextbox">
    <Grid HorizontalOptions="FillAndExpand" >
        <Border Grid.Row="0" HeightRequest="60" Stroke="{x:StaticResource GrayColor}"
        StrokeThickness="1"
        StrokeShape="RoundRectangle 10"
        Background="white"
        Padding="16,8"
        HorizontalOptions="FillAndExpand">


            <Entry x:Name="txt" PlaceholderColor="{x:StaticResource GrayColor}" TextColor="{x:StaticResource Primary}" FontSize="15" />
        </Border>
        <Label Grid.Row="0" x:Name="lbl" Margin="20,0,0,60" HorizontalOptions="Start" BackgroundColor="White" TextColor="{x:StaticResource GrayColor}"></Label>

    </Grid>
</ContentView>
Code Behind code
public partial class HeaderTextbox : ContentView
{
    public HeaderTextbox()
    {
        InitializeComponent();
    }
    public string PlaceholderText
    {
        get => txt.Placeholder;
        set => txt.Placeholder = value;
    }

    public string Text
    {
        get => txt.Text; 
        set => txt.Text = value; 
    }

    public Double FontSize
    {
        get => txt.FontSize;
        set => txt.FontSize = value;
    }

    public Keyboard KeyBoard
    {
        get => txt.Keyboard;
        set => txt.Keyboard = value;
    }

    public int MaxLength
    {
        get => txt.MaxLength;
        set => txt.MaxLength = value;
    }

    public string Header
    {
        get => lbl.Text;
        set => lbl.Text = (string.IsNullOrEmpty(value)) ? "" : " " + value + " ";
    }

    public bool IsPassword
    {
        get => txt.IsPassword;
        set => txt.IsPassword = value;
    }
}

Login UI:

Building User Authentication Interfaces in .NET MAUI: Login, Register, OTP Verification, and Forgot Password
Login UI Design #Login

Let's start by creating a simple login interface. Open your .NET MAUI project and navigate to the XAML file for the login page. Replace the existing XAML code with the following:
  <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Ecommerce.UI.Template.Pages.Login"
             xmlns:controls="clr-namespace:Ecommerce.UI.Template.CustomControls"
             xmlns:mct="clr-namespace:CommunityToolkit.Maui.Behaviors;assembly=CommunityToolkit.Maui"
             Title="Login"
             BackgroundColor="White"
             NavigationPage.HasNavigationBar="False">
    <ContentPage.Behaviors>
        <mct:StatusBarBehavior StatusBarColor="{x:StaticResource Primary}" />
    </ContentPage.Behaviors>

    <Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
          RowDefinitions="230,*" ColumnDefinitions="*">
        <Image Grid.Row="0" Source="loginbg.png" Aspect="Fill" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>
        <Label Grid.Row="0" VerticalOptions="EndAndExpand" Text="Login to your account"  Margin="20,0,0,45" TextColor="White" FontSize="{x:StaticResource FiftyFontSize}"></Label>
        <Label Grid.Row="0" VerticalOptions="EndAndExpand" Margin="20,0,0,25" Text="Login to your account" TextColor="White" FontSize="15"></Label>
        <Grid Grid.Row="1" Padding="20" VerticalOptions="FillAndExpand"  HorizontalOptions="FillAndExpand"  ColumnDefinitions="*" RowDefinitions="Auto,Auto,Auto,Auto,Auto">
            <controls:HeaderTextbox Grid.Row="0" HorizontalOptions="FillAndExpand" Header="Email"></controls:HeaderTextbox>
            <controls:HeaderTextbox Grid.Row="1" Header="Password" IsPassword="true"></controls:HeaderTextbox>
            <Label Text="Forget Password?" Grid.Row="2" Margin="0,10" FontAttributes="Bold" HorizontalOptions="EndAndExpand" TextColor="{x:StaticResource Primary}" HorizontalTextAlignment="End">
                <Label.GestureRecognizers>
                    <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped_1"></TapGestureRecognizer>
                </Label.GestureRecognizers>
            </Label>
            <Button Text="Login" Grid.Row="3" CornerRadius="10" HeightRequest="60" BackgroundColor="{x:StaticResource Primary}" FontSize="20" ></Button>
            <Label FontAttributes="Bold" Grid.Row="4" Margin="0,10"  HorizontalOptions="EndAndExpand" HorizontalTextAlignment="End" >
                <Label.FormattedText>
                    <FormattedString>
                        <Span TextColor="{x:StaticResource GrayColor}" Text="Don't have an account?"></Span>
                        <Span TextColor="{x:StaticResource Primary}" Text=" Register"></Span>
                    </FormattedString>
                </Label.FormattedText>
                <Label.GestureRecognizers>
                    <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped"></TapGestureRecognizer>
                </Label.GestureRecognizers>
            </Label>
        </Grid>
    </Grid>
</ContentPage>
Next, open the code-behind file for the login page and implement the event handler for the login button:
public partial class Login : ContentPage
{
    public Login()
    {
        InitializeComponent();
    }

    private async void TapGestureRecognizer_Tapped(object sender, TappedEventArgs e)
    {
        try
        {
            await Navigation.PushAsync(new Register());
        }
        catch (Exception ex)
        {
            await DisplayAlert("Ecommerce", ex.Message, "OK");
        }
    }

    private async void TapGestureRecognizer_Tapped_1(object sender, TappedEventArgs e)
    {
        try
        {
            await Navigation.PushAsync(new ForgotPassword());
        }
        catch (Exception ex)
        {
            await DisplayAlert("Ecommerce", ex.Message, "OK");
        }
    }
}
Register UI:

Building User Authentication Interfaces in .NET MAUI: Login, Register, OTP Verification, and Forgot Password
Register UI #Register

Now let's move on to the register page. Create a new XAML file for the register page and replace the code with the following:
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Ecommerce.UI.Template.Pages.Register"
             xmlns:controls="clr-namespace:Ecommerce.UI.Template.CustomControls"
             xmlns:mct="clr-namespace:CommunityToolkit.Maui.Behaviors;assembly=CommunityToolkit.Maui"
             Title="Register"
             BackgroundColor="White"
             NavigationPage.HasNavigationBar="False">
    <ContentPage.Behaviors>
        <mct:StatusBarBehavior StatusBarColor="{x:StaticResource Primary}" />
    </ContentPage.Behaviors>
    <Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
          RowDefinitions="230,*" ColumnDefinitions="*">
        <Image Grid.Row="0" Source="loginbg.png" Aspect="Fill" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>
        <Label Grid.Row="0" VerticalOptions="EndAndExpand" Text="Register"  Margin="20,0,0,45" TextColor="White" FontSize="{x:StaticResource FiftyFontSize}"></Label>   
        <Label Grid.Row="0" VerticalOptions="EndAndExpand" Margin="20,0,0,25" Text="Create your account" TextColor="White" FontSize="15"></Label>
        <Grid Grid.Row="1" Padding="20" VerticalOptions="FillAndExpand"  HorizontalOptions="FillAndExpand"  ColumnDefinitions="*" RowDefinitions="Auto,Auto,Auto,Auto,Auto,Auto">
            <controls:HeaderTextbox Grid.Row="0" Grid.Column="0" HorizontalOptions="FillAndExpand" Header="Full Name"></controls:HeaderTextbox>
            <controls:HeaderTextbox Grid.Row="1" HorizontalOptions="FillAndExpand" Header="Email"></controls:HeaderTextbox>
            <controls:HeaderTextbox Grid.Row="2" Header="Password" IsPassword="true"></controls:HeaderTextbox>
            <controls:HeaderTextbox Grid.Row="3" Header="Confirm Password" IsPassword="true"></controls:HeaderTextbox>
           
            <Button x:Name="btnRegister" Text="Register" Grid.Row="4" CornerRadius="10" HeightRequest="60" Clicked="btnRegister_Clicked" BackgroundColor="{x:StaticResource Primary}" FontSize="20" ></Button>
            <Label FontAttributes="Bold" Grid.Row="5" Margin="0,10"  HorizontalOptions="EndAndExpand" HorizontalTextAlignment="End" >
                <Label.FormattedText>
                    <FormattedString>
                        <Span TextColor="{x:StaticResource GrayColor}" Text="Already have account?"></Span>
                        <Span TextColor="{x:StaticResource Primary}" Text=" Login"></Span>
                    </FormattedString>
                </Label.FormattedText>
                <Label.GestureRecognizers>
                    <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped"></TapGestureRecognizer>
                </Label.GestureRecognizers>
            </Label>


        </Grid>
    </Grid>
</ContentPage>
In the code-behind file for the register page, implement the event handler for the register button:
public partial class Register : ContentPage
{
    public Register()
    {
        InitializeComponent();
    }

    private async void TapGestureRecognizer_Tapped(object sender, TappedEventArgs e)
    {
        try
        {
            await Navigation.PopToRootAsync();
        }
        catch (Exception ex)
        {
            await DisplayAlert("Ecommerce", ex.Message, "OK");
        }
    }

    private async void btnRegister_Clicked(object sender, EventArgs e)
    {
        try
        {
            await Navigation.PushAsync(new OTPVerification());
        }
        catch (Exception ex)
        {
            await DisplayAlert("Ecommerce", ex.Message, "OK");
        }
    }
}
OTP Verification UI:
Building User Authentication Interfaces in .NET MAUI: Login, Register, OTP Verification, and Forgot Password
OTP VerificationUI #OTP #Verification

To add an OTP verification page, create a new XAML file and replace the code with the following:
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Ecommerce.UI.Template.Pages.OTPVerification"
             xmlns:controls="clr-namespace:Ecommerce.UI.Template.CustomControls"
             xmlns:mct="clr-namespace:CommunityToolkit.Maui.Behaviors;assembly=CommunityToolkit.Maui"
             Title="OTP Verification"
             BackgroundColor="White"
             NavigationPage.HasNavigationBar="False">
    <ContentPage.Behaviors>
        <mct:StatusBarBehavior StatusBarColor="{x:StaticResource Primary}" />
    </ContentPage.Behaviors>

    <Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
          RowDefinitions="230,*" ColumnDefinitions="*">
        <Image Grid.Row="0" Source="loginbg.png" Aspect="Fill" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>
        <Label Grid.Row="0" VerticalOptions="EndAndExpand" Text="OTP Verification"  Margin="20,0,0,45" TextColor="White" FontSize="{x:StaticResource FiftyFontSize}"></Label>
        <Label Grid.Row="0" VerticalOptions="EndAndExpand" Margin="20,0,0,25" Text="Verification code has been send to your email." TextColor="White" FontSize="15"></Label>
        <Grid Grid.Row="1" Padding="20" ColumnSpacing="20" VerticalOptions="FillAndExpand"  HorizontalOptions="FillAndExpand"  RowDefinitions="Auto,200" ColumnDefinitions="*,*,*,*">
            <controls:HeaderTextbox Grid.Column="0" MaxLength="1" KeyBoard="Numeric" FontSize="20"></controls:HeaderTextbox>
            <controls:HeaderTextbox Grid.Column="1" MaxLength="1" KeyBoard="Numeric" FontSize="20"></controls:HeaderTextbox>
            <controls:HeaderTextbox Grid.Column="2" MaxLength="1" KeyBoard="Numeric" FontSize="20"></controls:HeaderTextbox>
            <controls:HeaderTextbox Grid.Column="3" MaxLength="1" KeyBoard="Numeric" FontSize="20"></controls:HeaderTextbox>
            <Button Text="Verify" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="4" CornerRadius="10" HeightRequest="60" BackgroundColor="{x:StaticResource Primary}" FontSize="20" ></Button>
        </Grid>
    </Grid>
</ContentPage>
In the code-behind file for the OTP verification page, implement the event handler:
public partial class OTPVerification : ContentPage
{
    public OTPVerification()
    {
        InitializeComponent();
    }

    private async void TapGestureRecognizer_Tapped(object sender, TappedEventArgs e)
    {
        try
        {
            await Navigation.PopToRootAsync();
        }
        catch (Exception ex)
        {
            await DisplayAlert("Ecommerce", ex.Message, "OK");
        }
    }
}
Forgot Password UI:
Building User Authentication Interfaces in .NET MAUI: Login, Register, OTP Verification, and Forgot Password
Forgot Password #ForgotPasswor
Finally, let's create a forgot password page. Create a new XAML file and replace the code with the following:
 <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Ecommerce.UI.Template.Pages.ForgotPassword"
             xmlns:controls="clr-namespace:Ecommerce.UI.Template.CustomControls"
             xmlns:mct="clr-namespace:CommunityToolkit.Maui.Behaviors;assembly=CommunityToolkit.Maui"
             Title="Login"
             BackgroundColor="White"
             NavigationPage.HasNavigationBar="False">
    <ContentPage.Behaviors>
        <mct:StatusBarBehavior StatusBarColor="{x:StaticResource Primary}" />
    </ContentPage.Behaviors>

    <Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand"
          RowDefinitions="230,*" ColumnDefinitions="*">
        <Image Grid.Row="0" Source="loginbg.png" Aspect="Fill" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"/>
        <Label Grid.Row="0" VerticalOptions="EndAndExpand" Text="Forgot Password"  Margin="20,0,0,45" TextColor="White" FontSize="{x:StaticResource FiftyFontSize}"></Label>
        <Label Grid.Row="0" VerticalOptions="EndAndExpand" Margin="20,0,0,25" Text="Enter your email account to reset password" TextColor="White" FontSize="15"></Label>
        <Grid Grid.Row="1" Padding="20" VerticalOptions="FillAndExpand" RowSpacing="10"  HorizontalOptions="FillAndExpand"  ColumnDefinitions="*" RowDefinitions="Auto,100,Auto">
            <controls:HeaderTextbox Grid.Row="0" HorizontalOptions="FillAndExpand" Header="Email"></controls:HeaderTextbox>
            <Button Text="Reset Password" Grid.Row="1" CornerRadius="10" HeightRequest="60" VerticalOptions="End" BackgroundColor="{x:StaticResource Primary}" FontSize="20" ></Button>
            <Label FontAttributes="Bold" Grid.Row="5" Margin="0,10"  HorizontalOptions="EndAndExpand" HorizontalTextAlignment="End" >
                <Label.FormattedText>
                    <FormattedString>
                        <Span TextColor="{x:StaticResource GrayColor}" Text="Remember Password?"></Span>
                        <Span TextColor="{x:StaticResource Primary}" Text=" Login"></Span>
                    </FormattedString>
                </Label.FormattedText>
                <Label.GestureRecognizers>
                    <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped"></TapGestureRecognizer>
                </Label.GestureRecognizers>
            </Label>
        </Grid>
    </Grid>
</ContentPage>
In the code-behind file for the forgot password page, implement the event handler:
public partial class ForgotPassword : ContentPage
{
    public ForgotPassword()
    {
        InitializeComponent();
    }


    private async void TapGestureRecognizer_Tapped(object sender, EventArgs e)
    {
        try
        {
            await Navigation.PopToRootAsync();
        }
        catch (Exception ex)
        {
            await DisplayAlert("Ecommerce", ex.Message, "OK");
        }
    }
}
Conclusion:
In this blog post, we've covered the implementation of essential user authentication interfaces in .NET MAUI. You can further enhance these screens by adding validation, connecting them to backend services, and handling errors gracefully. Remember to leverage the rich set of controls and layouts provided by .NET MAUI to create a visually appealing and intuitive user experience. With these foundations in place, you can build robust and secure authentication flows for your .NET MAUI applications.

-

Comments

  1. AnonymousOctober 3, 2023 at 11:58 PM

    I not able to bind email in text, getting error

    ReplyDelete
  2. AnonymousOctober 3, 2023 at 11:58 PM

    Using this control

    ReplyDelete

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