Custom Date Picker Using SfPicker

5 Jun 202014 minutes to read

This section will explain about how to create custom DatePicker using Picker control.

Steps

Step 1 : We have created custom class named as “DatePicker”. This class should be inherited from SfPicker control.

public class DatePicker : SfPicker
{

}

Step 2 : After that create four ObservableCollection with object type in DatePicker class.

Collection details :

Date Collection, Day Collection, Month Collection and Year Collection.

Day collection -> We have added current month days using DateTime.DaysInMonth.

Month collection -> We have added Jan to Dec months.

Year collection -> We have added 1990 to 2050 years.

Date collection -> We have added all the three collections.

Date Collection in main collection we have assigned this collection to ItemsSource of Picker control.

The below code demonstrates Date collection creation.

public class DatePicker : SfPicker
{
    #region Public Properties

    // Months API is used to modify the Day collection as per change in Month
    internal Dictionary<string, string> Months { get; set; }

    /// <summary>
    /// Date is the actual DataSource for SfPicker control which will holds the collection of Day ,Month and Year
    /// </summary>
    /// <value>The date.</value>

    public ObservableCollection<object> Date { get; set; }

    //Day is the collection of day numbers
    internal ObservableCollection<object> Day { get; set; }

    //Month is the collection of Month Names
    internal ObservableCollection<object> Month { get; set; }

    //Year is the collection of Years from 1990 to 2042
    internal ObservableCollection<object> Year { get; set; }

    #endregion
    public DatePicker()
    {
        Months = new Dictionary<string, string>();
        Date = new ObservableCollection<object>();
        Day = new ObservableCollection<object>();
        Month = new ObservableCollection<object>();
        Year = new ObservableCollection<object>();
        PopulateDateCollection();
        this.ItemsSource = Date;
    }

    private void PopulateDateCollection()
    {
        //populate months
        for (int i = 1; i < 13; i++)
        {
            if (!Months.ContainsKey(CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(i).Substring(0, 3)))
                Months.Add(CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(i).Substring(0, 3), CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(i));
            Month.Add(CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(i).Substring(0, 3));
        }

        //populate year
        for (int i = 1990; i < 2050; i++)
        {
            Year.Add(i.ToString());
        }

        //populate Days
        for (int i = 1; i <= DateTime.DaysInMonth(DateTime.Now.Year, DateTime.Now.Month); i++)
        {
            if (i < 10)
            {
                Day.Add("0" + i);
            }

            else
                Day.Add(i.ToString());
        }

        Date.Add(Month);
        Date.Add(Day);
        Date.Add(Year);
    }
}

Step 3 : We have updated the days value based on month and year value using SelectionChanged event of SfPicker control. since the days of each month differs we have to handle this collection.

public class DatePicker : SfPicker
{
    public DatePicker()
    {
        this.SelectionChanged += DatePicker_SelectionChanged;
    }

    private void DatePicker_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        UpdateDays(Date, e);
    }

    //UpdateDays method is used to alter the Date collection as per selection change in Month column(if Feb is Selected day collection has value from 1 to 28)
    public void UpdateDays(ObservableCollection<object> Date, SelectionChangedEventArgs e)
    {
        try
        {
            bool isupdate = false;
            if (e.OldValue != null && e.NewValue != null && (e.OldValue as IList).Count > 0 && (e.NewValue as IList).Count > 0)
            {
                if ((e.OldValue as IList)[0] != (e.NewValue as IList)[0])
                {
                    isupdate = true;
                }

                if ((e.OldValue as IList)[2] != (e.NewValue as IList)[2])
                {
                    isupdate = true;
                }
            }

            if (isupdate)
            {
                ObservableCollection<object> days = new ObservableCollection<object>();
                int month = DateTime.ParseExact(Months[(e.NewValue as IList)[0].ToString()], "MMMM", CultureInfo.CurrentCulture).Month;
                int year = int.Parse((e.NewValue as IList)[2].ToString());
                for (int j = 1; j <= DateTime.DaysInMonth(year, month); j++)
                {
                    if (j < 10)
                    {
                        days.Add("0" + j);
                    }
                    else
                        days.Add(j.ToString());
                }

                if (days.Count > 0)
                {
                    Date.RemoveAt(1);
                    Date.Insert(1, days);
                    this.ItemsSource = Date;
                }
            }
        }
        catch
        {

        }
    }
}

Step 4 : We have defined each column headers “MONTH”, “DAY”, “YEAR”, “HOUR” and “MINUTE” using ColumnHeaderText property of SfPicker control. The below code demonstrates how to define header for each column of SfPicker control.

public class DatePicker : SfPicker
{
    /// <summary>
    /// Headers API is holds the column name for every column in date picker
    /// </summary>
    /// <value>The Headers.</value>
    public ObservableCollection<string> Headers { get; set; }

    public DatePicker()
    {
        Headers = new ObservableCollection<string>();
        Headers.Add("MONTH");
        Headers.Add("DAY");
        Headers.Add("YEAR");

        //SfPicker header text
        HeaderText = "Date PICKER ";

        // Column header text collection
        this.ColumnHeaderText = Headers;
    }
}

Step 5 : Finally we have enabled SfPicker footer, header and ColumnHeader using ShowFooter, ShowColumnHeader properties.

public DatePicker()
{
    //Enable Footer
    ShowFooter = true;

    //Enable SfPicker Header
    ShowHeader = true;

    //Enable Column Header of SfPicker
    ShowColumnHeader = true;
}

Step 6 : We have added the DatePicker control in ViewDidLoad page. Please refer the below code snippets.

public partial class ViewController : UIViewController
{

    DatePicker datePicker;

    public ViewController(IntPtr handle) : base(handle)
    {
        datePicker = new DatePicker();
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        datePicker.ColumnHeaderHeight = 70;
        datePicker.PickerMode = PickerMode.Default;
        datePicker.PickerHeight = 400;
        datePicker.PickerWidth = 300;
        datePicker.SelectedItem = datePicker.StartDate;
        datePicker.BackgroundColor = UIColor.White;
        datePicker.Frame = new CoreGraphics.CGRect(0, 0, this.View.Frame.Width, this.View.Frame.Height);
        this.View.AddSubview(datePicker);
    }

    public override void DidReceiveMemoryWarning()
    {
        base.DidReceiveMemoryWarning();
        // Release any cached data, images, etc that aren't in use.
    }

}

Screen shot for the above code

DatePicker

You can get the sample from the following link.