How to Create Calendar Control In Xamarin Form

 

NuGet Package: https://www.nuget.org/packages/CustomCalendarControl/1.0.5

Github URL: https://github.com/mistrypragnesh40/CustomCalendarControl

Plugin Required.

Refractored.MvvmHelpers
Rg.Plugins.Popup :
Install Rg.Plugin.Popup Plugin in android, ios & Xamarin Form Project.

Initialize it in MainActivity.cs &  AppDelegate.cs 

Rg.Plugins.Popup.Popup.Init(this); (Android)

Rg.Plugins.Popup.Popup.Init(); (ios)

Views
CalendarPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<pages:PopupPage  xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:system="clr-namespace:System;assembly=netstandard" 
             xmlns:pages="clr-namespace:Rg.Plugins.Popup.Pages;assembly=Rg.Plugins.Popup"
             xmlns:animations="clr-namespace:Rg.Plugins.Popup.Animations;assembly=Rg.Plugins.Popup"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Name="this"
             x:Class="CustomCalendarControl.Views.CalendarPage">
    <pages:PopupPage.Animation>
        <animations:ScaleAnimation 
            PositionIn="Bottom"
            PositionOut="Bottom"
            ScaleIn="1.2"
            ScaleOut="0.8"
            DurationIn="200"
            DurationOut="200"
            EasingIn="SinOut"
            EasingOut="SinIn"
            HasBackgroundAnimation="True"/>
    </pages:PopupPage.Animation>
    <ContentPage.Content>
        <AbsoluteLayout  VerticalOptions="CenterAndExpand"  HorizontalOptions="CenterAndExpand"
            AbsoluteLayout.LayoutBounds="1,1,1,1"
            AbsoluteLayout.LayoutFlags="All"
            BackgroundColor="Transparent">
            <!--<DatePicker />-->
            <Grid   Padding="0,0,0,30" Margin="5,0,5,0" IsClippedToBounds="True" BackgroundColor="White" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" >
                <Grid.RowDefinitions>
                    <RowDefinition Height="auto" />
                    <RowDefinition Height="auto" />
                    <RowDefinition Height="auto" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
 
                <Label LineHeight="1.2" Grid.Row="0" BackgroundColor="Orange" Padding="15,15,5,15" >
                    <Label.FormattedText>
                        <FormattedString>
                            <Span Text="{Binding CurrentYear}" TextColor="White" FontSize="18" >
                                <Span.GestureRecognizers>
                                    <TapGestureRecognizer Command="{Binding ShowYearListCommand}"/>
                                </Span.GestureRecognizers>
                            </Span>
                            <Span Text="{x:Static system:Environment.NewLine}" />
                            <Span Text="{Binding SelectedDateInString}" TextColor="White" />
                        </FormattedString>
                    </Label.FormattedText>
                </Label>
 
                <ListView BackgroundColor="White"  x:Name="lstYear"  HeightRequest="340" WidthRequest="310"  Grid.Row="1"   ItemsSource="{Binding YearList}"  VerticalOptions="FillAndExpand">
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <ViewCell>
                                <StackLayout Margin="0,10,0,10">
                                    <Label HorizontalTextAlignment="Center" Text="{Binding .}" />
                                    <StackLayout.GestureRecognizers>
                                        <TapGestureRecognizer CommandParameter="{Binding .}" Command="{Binding Source={x:Reference this},Path=BindingContext.YearSelectionCommand}" />
                                    </StackLayout.GestureRecognizers>
                                </StackLayout>
                            </ViewCell>
                        </DataTemplate>
                    </ListView.ItemTemplate>
                    <ListView.Triggers>
                        <DataTrigger TargetType="ListView" Binding="{Binding IsCalendarDetailsVisible}" Value="True">
                            <Setter Property="IsVisible"  Value="False" />
                        </DataTrigger>
                        <DataTrigger TargetType="ListView" Binding="{Binding IsCalendarDetailsVisible}" Value="False">
                            <Setter Property="IsVisible"  Value="True" />
                        </DataTrigger>
                    </ListView.Triggers>
                </ListView>
                <StackLayout Grid.Row="2" Padding="0" IsVisible="{Binding IsCalendarDetailsVisible}">
                    <Grid  ColumnDefinitions="34,34,34,34,34,34,34" IsVisible="{Binding IsCalendarDetailsVisible}" Margin="30,0,0,0"  HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" >
                        <Label FontSize="12" Text="S" Grid.Row="1" TextColor="Red"  Grid.Column="0" />
                        <Label FontSize="12" Text="M" Grid.Row="1" TextColor="Gray" Grid.Column="1"/>
                        <Label FontSize="12" Text="T" Grid.Row="1" TextColor="Gray" Grid.Column="2"/>
                        <Label FontSize="12" Text="W" Grid.Row="1" TextColor="Gray" Grid.Column="3"/>
                        <Label FontSize="12" Text="T" Grid.Row="1" TextColor="Gray" Grid.Column="4"/>
                        <Label FontSize="12" Text="F" Grid.Row="1" TextColor="Gray" Grid.Column="5"/>
                        <Label FontSize="12" Text="S" Grid.Row="1" TextColor="Gray" Grid.Column="6"/>
 
                        <Label VerticalTextAlignment="Center" Grid.Row="0" Grid.ColumnSpan="2" TextColor="Black"  Text="&lt;" FontSize="25"   HorizontalTextAlignment="Start" >
                            <Label.GestureRecognizers>
                                <TapGestureRecognizer Command="{Binding PreviousMonthCommand}" />
                            </Label.GestureRecognizers>
                        </Label>
                        <Label VerticalTextAlignment="Center" Grid.Row="0" Grid.Column="2" Grid.ColumnSpan="2" FontSize="13" FontAttributes="Bold"  HorizontalTextAlignment="Start" HorizontalOptions="CenterAndExpand" Text="{Binding CurrentMonthYear}"   TextColor="Black" />
                        <Label VerticalTextAlignment="Center"  HorizontalTextAlignment="Center" Grid.Row="0" Grid.Column="5" Grid.ColumnSpan="2" TextColor="Black"  Text="&gt;" FontSize="25"  >
                            <Label.GestureRecognizers>
                                <TapGestureRecognizer Command="{Binding NextMonthCommand}" />
                            </Label.GestureRecognizers>
                        </Label>
                    </Grid>
                    <CollectionView   IsVisible="{Binding IsCalendarDetailsVisible}"  Margin="15,0,0,0"    ItemsSource="{Binding CalendarList}" HeightRequest="260" WidthRequest="295" IsGrouped="True" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"    >
                        <CollectionView.GestureRecognizers>
                            <SwipeGestureRecognizer Direction="Left" Command="{Binding NextMonthCommand}" />
                            <SwipeGestureRecognizer Direction="Right" Command="{Binding PreviousMonthCommand}" />
                        </CollectionView.GestureRecognizers>
                        <CollectionView.ItemsLayout>
                            <GridItemsLayout SnapPointsType="MandatorySingle" SnapPointsAlignment="Center"  Span="7"  Orientation="Horizontal" />
                        </CollectionView.ItemsLayout>
                        <CollectionView.GroupHeaderTemplate>
                            <DataTemplate>
                                <Label Padding="0" />
                            </DataTemplate>
                        </CollectionView.GroupHeaderTemplate>
                        <CollectionView.ItemTemplate>
                            <DataTemplate>
                                <Frame BackgroundColor="Red"  HasShadow="False" Padding="0" Margin="0" HeightRequest="40"  WidthRequest="40">
                                    <Label FontSize="12" TextColor="Black"   Text="{Binding DateInNumberStr}" VerticalTextAlignment="Center"  HorizontalTextAlignment="Center" >
                                        <Label.Triggers>
                                            <DataTrigger TargetType="Label" Binding="{Binding CurrentDate}" Value="True">
                                                <Setter Property="TextColor" Value="White" />
                                            </DataTrigger>
                                        </Label.Triggers>
                                    </Label>
                                    <Frame.Triggers>
                                        <DataTrigger TargetType="Frame" Binding="{Binding CurrentDate}" Value="True">
                                            <Setter Property="BackgroundColor" Value="Orange" />
                                            <Setter Property="CornerRadius" Value="19.5" />
                                        </DataTrigger>
                                        <DataTrigger TargetType="Frame" Binding="{Binding CurrentDate}" Value="False">
                                            <Setter Property="BackgroundColor" Value="Transparent" />
                                        </DataTrigger>
                                    </Frame.Triggers>
                                    <Frame.GestureRecognizers>
                                        <TapGestureRecognizer Command="{Binding Source={x:Reference this}, Path=BindingContext.CurrentDateCommand}" CommandParameter="{Binding .}" />
                                    </Frame.GestureRecognizers>
                                </Frame>
                            </DataTemplate>
                        </CollectionView.ItemTemplate>
                    </CollectionView>
                </StackLayout>
                <Label Margin="0,0,90,0" Grid.Row="3" FontAttributes="Bold"  x:Name="lblCancelDate" Text="CANCEL" FontSize="17" TextColor="Orange" HorizontalOptions="End" >
                    <Label.GestureRecognizers>
                        <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped_ForCancelDate"  CommandParameter="{Binding .}" />
                    </Label.GestureRecognizers>
                </Label>
                <Label  Margin="0,0,30,0" Grid.Row="3"  FontAttributes="Bold"  TextColor="Orange" Text="OK" x:Name="lblSelectDate"  FontSize="17" HorizontalOptions="End"  >
                    <Label.GestureRecognizers>
                        <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped_ForSelectDate" CommandParameter="{Binding .}" />
                    </Label.GestureRecognizers>
                </Label>
            </Grid>
        </AbsoluteLayout>
    </ContentPage.Content>
</pages:PopupPage>

CalendarPage.xaml.cs

using CustomCalendarControl.ViewModels;
using Rg.Plugins.Popup.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
 
namespace CustomCalendarControl.Views
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class CalendarPage : Rg.Plugins.Popup.Pages.PopupPage
    {
        public CalendarPage(DateTime date)
        {
            InitializeComponent();
            this.BindingContext = new CalendarPageViewModel(date);
        }

        private void TapGestureRecognizer_Tapped_ForCancelDate(object sender, EventArgs e)
        {
            Device.BeginInvokeOnMainThread(async () =>
            {
                await PopupNavigation.Instance.PopAsync();
            });
        }

        public ICommand SelectedDateCommand { get; set; }
 
        private void TapGestureRecognizer_Tapped_ForSelectDate(object sender, EventArgs e)
        {
            var btnObject = (Label)sender;
            var context = (CalendarPageViewModel)btnObject.BindingContext;
            SelectedDateCommand.Execute(context.SelectedDate);
            TapGestureRecognizer_Tapped_ForCancelDate(sender, null);
        }
    }
}

ViewModels
CalendarPageViewModel.cs

using CustomCalendarControl.Models;
using MvvmHelpers;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Windows.Input;
using Xamarin.Forms;
 
namespace CustomCalendarControl.ViewModels
{
    public class CalendarPageViewModel : INotifyPropertyChanged
    {
        #region Properties & Event
        public event PropertyChangedEventHandler PropertyChanged;
 
        int MaxYear;
        int MinYear;
 
        public static List<CalendarModel> _staticCalendarList;
        public static List<int> dummyYearList;
        public ObservableRangeCollection<int> YearList { get; } = new ObservableRangeCollection<int>();
        public ObservableRangeCollection<Grouping<CalendarHeader, CalendarModel>> CalendarList { get; } = new ObservableRangeCollection<Grouping<CalendarHeader, CalendarModel>>();
 
 
        private bool _isCalendarDetailsVisible = true;
        public bool IsCalendarDetailsVisible
        {
            get => _isCalendarDetailsVisible;
            set { _isCalendarDetailsVisible = value; OnPropertyChanged(); }
        }
 
 
        private string _currentMonthYear = string.Empty;
        public string CurrentMonthYear
        {
            get => _currentMonthYear;
            set { _currentMonthYear = value; OnPropertyChanged(); }
        }
 
        private int _currentYear;
        public int CurrentYear
        {
            get => _currentYear;
            set { _currentYear = value; OnPropertyChanged(); }
        }
 
        private DateTime _currentDate;
        public DateTime CurrentDate
        {
            get => _currentDate;
            set
            {
                _currentDate = value; OnPropertyChanged();
            }
        }
 
        private DateTime? _selectedDate { get; set; }
        public DateTime? SelectedDate
        {
            get => _selectedDate;
            set
            {
                _selectedDate = value; OnPropertyChanged();
            }
        }
 
        private string _selectedDateInString;
        public string SelectedDateInString
        {
            get => _selectedDateInString;
            set { _selectedDateInString = value; OnPropertyChanged(); }
        }
        #endregion
 
        #region Constructor
        public CalendarPageViewModel(DateTime _selectedDate)
        {
            AddDates();
            BindDates(_selectedDate.Year, _selectedDate.Month, _selectedDate.ToString("MMM"), _selectedDate);
        }
 
        public CalendarPageViewModel()
        {
 
        }
 
        #endregion
 
        #region Methods
        private void AddDates()
        {
            MaxYear = DateTime.Now.Year + 30;
            MinYear = DateTime.Now.Year - 100;
 
            if (dummyYearList == null)
                dummyYearList = new List<int>();
 
            if (_staticCalendarList == null)
                _staticCalendarList = new List<CalendarModel>();
 
            if (_staticCalendarList.Count == 0)
            {
 
                for (int year = MinYear; year <= MaxYear; year++)
                {
                    for (int month = 1; month <= 12; month++)
                    {
                        int daysCount = DateTime.DaysInMonth(year, month);
                        var dates = new List<CalendarModel>();
                        for (int days = 1; days <= daysCount; days++)
                        {
                            DateTime date = new DateTime(year, month, days);
                            CalendarModel obj = new CalendarModel();
                            obj.Date = date;
                            obj.Year = year;
                            obj.Month = month;
                            obj.DateInNumber = days;
                            obj.DateInNumberStr = days + "";
                            obj.DayName = date.ToString("ddd");
                            dates.Add(obj);
                        }
                        _staticCalendarList.AddRange(dates);
                    }
                    dummyYearList.Add(year);
                }
            }
            else
            {
                if (dummyYearList.Count == 0)
                {
                    for (int year = MinYear; year <= MaxYear; year++)
                    {
                        dummyYearList.Add(year);
                    }
                }
                var selectedDates = _staticCalendarList.Where(f => f.CurrentDate == true).ToList();
                selectedDates.ForEach(f => { f.CurrentDate = false; });
            }
            YearList.AddRange(dummyYearList.OrderByDescending(f => f).ToList());
        }
        public void BindDates(int year, int month, string MonthName, DateTime? newDate)
        {
            CalendarList.Clear();
            bool isFoundStartDate = false;
            int days = DateTime.DaysInMonth(year, month);
            CurrentMonthYear = MonthName + "  " + year.ToString();
 
            var dates = _staticCalendarList.Where(f => f.Year == year && f.Month == month).ToList();
            if (dates.Count > 0)
            {
                if (newDate.HasValue)
                {
                    var currentDate = dates.Where(f => f.DateInNumber == newDate?.Day).FirstOrDefault();
                    currentDate.CurrentDate = true;
                    SelectedDate = newDate.Value;
                    CurrentDate = newDate.Value;
                    CurrentYear = year;
                    SelectedDateInString = CurrentDate.ToString("ddd, MMMM dd");
                }
 
                string startDayName = dates.Where(f => f.DateInNumber == 1).FirstOrDefault().DayName.ToLower();
 
                var list = new List<CalendarModel>();
                var header = new CalendarHeader();
                header.DayName = "Sun";
                if (startDayName != header.DayName.ToLower() && !isFoundStartDate)
                {
                    list.Add(new CalendarModel());
                }
                else
                {
                    isFoundStartDate = true;
                }
                list.AddRange(dates.Where(f => f.DayName.ToLower() == header.DayName.ToLower()).ToList());
                CalendarList.Add(new Grouping<CalendarHeader, CalendarModel>(header, list));
 
                list.Clear();
                header = new CalendarHeader();
                header.DayName = "Mon";
                if (startDayName != header.DayName.ToLower() && !isFoundStartDate)
                {
                    list.Add(new CalendarModel());
                }
                else
                {
                    isFoundStartDate = true;
                }
                list.AddRange(dates.Where(f => f.DayName.ToLower() == header.DayName.ToLower()).ToList());
                CalendarList.Add(new Grouping<CalendarHeader, CalendarModel>(header, list));
 
 
                list.Clear();
                header = new CalendarHeader();
                header.DayName = "Tue";
                if (startDayName != header.DayName.ToLower() && !isFoundStartDate)
                {
                    list.Add(new CalendarModel());
                }
                else
                {
                    isFoundStartDate = true;
                }
                list.AddRange(dates.Where(f => f.DayName.ToLower() == header.DayName.ToLower()).ToList());
                CalendarList.Add(new Grouping<CalendarHeader, CalendarModel>(header, list));
 
                list.Clear();
                header = new CalendarHeader();
                header.DayName = "Wed";
                if (startDayName != header.DayName.ToLower() && !isFoundStartDate)
                {
                    list.Add(new CalendarModel());
                }
                else
                {
                    isFoundStartDate = true;
                }
                list.AddRange(dates.Where(f => f.DayName.ToLower() == header.DayName.ToLower()).ToList());
                CalendarList.Add(new Grouping<CalendarHeader, CalendarModel>(header, list));
 
                list.Clear();
                header = new CalendarHeader();
                header.DayName = "Thu";
                if (startDayName != header.DayName.ToLower() && !isFoundStartDate)
                {
                    list.Add(new CalendarModel());
                }
                else
                {
                    isFoundStartDate = true;
                }
                list.AddRange(dates.Where(f => f.DayName.ToLower() == header.DayName.ToLower()).ToList());
                CalendarList.Add(new Grouping<CalendarHeader, CalendarModel>(header, list));
 
                list.Clear();
                header = new CalendarHeader();
                header.DayName = "Fri";
                if (startDayName != header.DayName.ToLower() && !isFoundStartDate)
                {
                    list.Add(new CalendarModel());
                }
                else
                {
                    isFoundStartDate = true;
                }
                list.AddRange(dates.Where(f => f.DayName.ToLower() == header.DayName.ToLower()).ToList());
                CalendarList.Add(new Grouping<CalendarHeader, CalendarModel>(header, list));
 
 
                list.Clear();
                header = new CalendarHeader();
                header.DayName = "Sat";
                if (startDayName != header.DayName.ToLower() && !isFoundStartDate)
                {
                    list.Add(new CalendarModel());
                }
                else
                {
                    isFoundStartDate = true;
                }
                list.AddRange(dates.Where(f => f.DayName.ToLower() == header.DayName.ToLower()).ToList());
                CalendarList.Add(new Grouping<CalendarHeader, CalendarModel>(header, list));
            }
        }
        protected void OnPropertyChanged([CallerMemberName] string propertyValue = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyValue));
        }
        #endregion
 
        #region Commands
        // used for Traverse through date
        public ICommand CurrentDateCommand
        {
            get
            {
                return new Command<CalendarModel>((item) =>
                {
                    if (item?.DayName != null)
                    {
                        var selectedDates = _staticCalendarList.Where(f => f.CurrentDate == true).ToList();
                        selectedDates.ForEach(f => { f.CurrentDate = false; });
 
                        CurrentDate = item.Date;
                        CurrentYear = item.Date.Year;
                        item.CurrentDate = true;
                        SelectedDateInString = item.Date.ToString("ddd, dd MMMM");
                        SelectedDate = CurrentDate;
                    }
 
                });
            }
        }
 
 
        //Executed on the Tap of Cancel Button.
        public ICommand CancelCommand
        {
            get
            {
                return new Command(() =>
                {
                    SelectedDate = null;
                });
            }
        }
 
        //Executed on the Tap of > Sign.
        public ICommand NextMonthCommand
        {
            get
            {
                return new Command(() =>
                {
                    if (CurrentDate != null)
                    {
                        bool isMaxDateReach = false;
                        if (MaxYear == CurrentDate.Year && CurrentDate.Month == 12)
                        {
                            isMaxDateReach = true;
                        }
                        if (!isMaxDateReach)
                        {
                            CurrentDate = CurrentDate.Date.AddMonths(1);
                            BindDates(CurrentDate.Year, CurrentDate.Month, CurrentDate.ToString("MMM"), null);
                        }
                    }
                });
            }
        }
 
        //Executed on the Tap of < Sign.
        public ICommand PreviousMonthCommand
        {
            get
            {
                return new Command(() =>
                {
                    if (CurrentDate != null)
                    {
                        bool isMinDateReach = false;
                        if (MinYear == CurrentDate.Year && CurrentDate.Month == 1)
                        {
                            isMinDateReach = true;
                        }
                        if (!isMinDateReach)
                        {
                            CurrentDate = CurrentDate.Date.AddMonths(-1);
                            BindDates(CurrentDate.Year, CurrentDate.Month, CurrentDate.ToString("MMM"), null);
                        }
                    }
                });
            }
        }
 
 
        public ICommand YearSelectionCommand
        {
            get
            {
                return new Command<int>((year) =>
                {
                    if (year > 0 && SelectedDate.HasValue)
                    {
                        DateTime newDate;
                        try
                        {
                            newDate = new DateTime(year, (int)SelectedDate?.Month, (int)SelectedDate?.Day);
 
                        }
                        catch (ArgumentOutOfRangeException ex)
                        {
                            newDate = new DateTime(year, (int)SelectedDate?.Month, (int)SelectedDate?.Day - 1);
                        }
 
                        BindDates(year, newDate.Month, newDate.ToString("MMM"), newDate);
                        IsCalendarDetailsVisible = true;
                    }
                });
            }
        }
 
        public ICommand ShowYearListCommand
        {
            get
            {
                return new Command(() =>
                {
                    if (CurrentDate != null)
                    {
                        IsCalendarDetailsVisible = !IsCalendarDetailsVisible;
                    }
                });
            }
        }
        #endregion
    }
}
 
 

Models
CalendarModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Text;
 
namespace CustomCalendarControl.Models
{
    public class CalendarModel : INotifyPropertyChanged
    {
        public int Year { get; set; }
        public int Month { get; set; }
        public string DayName { get; set; }
        public int DateInNumber { get; set; }
        public string DateInNumberStr { get; set; }
 
        private bool _currentDate;
        public bool CurrentDate
        {
            get => _currentDate; set
            {
                _currentDate = value; OnPropertyChanged();
            }
        }
        public DateTime Date { get; set; }
 
        public event PropertyChangedEventHandler PropertyChanged;
 
        protected void OnPropertyChanged([CallerMemberName] string propertyValue = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyValue));
        }
    }
}

CalendarHeader.cs

using System;
using System.Collections.Generic;
using System.Text;
 
namespace CustomCalendarControl.Models
{
    public class CalendarHeader
    {
        public string DayName { get; set; }
    }
}
 

Implementations

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="CustomCalendarControl.MainPage">
 
    <StackLayout>
        <Frame BackgroundColor="#2196F3" Padding="24" CornerRadius="0">
            <Label Text="Welcome to Xamarin.Forms!" HorizontalTextAlignment="Center" TextColor="White" FontSize="36"/>
        </Frame>
        <Label x:Name="lblDate" />
        <Button Text="Open Calendar" x:Name="btnCalendar"  Clicked="btnCalendar_Clicked" />
    </StackLayout>
</ContentPage>
 
MainPage.xaml.cs
using CalendarControl.Views;
using Rg.Plugins.Popup.Services;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
 
namespace CustomCalendarControl
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }
 
        private async void btnCalendar_Clicked(object sender, System.EventArgs e)
        {
            var calendarPage = new CalendarPage(DateTime.Now);
            calendarPage.SelectedDateCommand = new Command<DateTime>((item) =>
            {
                lblDate.Text = item.ToString("dd MMM yyyy");
            });
            await PopupNavigation.Instance.PushAsync(calendarPage);
        }
    }
}