show datePicker in Xamarin.Forms when click Frame Layout - xamarin

Question

I am doing an application using Xamarin.Forms. There I need to show a datePicker when clicks on a Frame layout. For that purpose I have done this.
xaml part
<Frame Margin="15,0,15,5" HasShadow="false" OutlineColor="{StaticResource TextColorBlue}" BackgroundColor="White" x:Name="selectDate" HorizontalOptions="FillAndExpand">
<StackLayout Orientation="Vertical" HorizontalOptions="FillAndExpand">
<DatePicker x:Name="datePicker" IsVisible="false" DateSelected="Handle_DateSelected" TextColor="Maroon" />
<Label Text="Date" FontAttributes="Bold" FontSize="20" HorizontalOptions="Center" TextColor="{StaticResource TextColorBlue}" />
<BoxView HorizontalOptions="FillAndExpand" BackgroundColor="Silver" HeightRequest="1" />
<Grid RowSpacing="1" ColumnSpacing="1" HorizontalOptions="FillAndExpand">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Label Text="Saturday" FontAttributes="Bold" FontSize="25" Grid.Row="0" Grid.Column="0" HorizontalOptions="Center" VerticalOptions="Center" TextColor="{StaticResource TextColorBlue}" />
<Label Text="May" FontAttributes="Bold" FontSize="25" Grid.Row="0" Grid.Column="1" HorizontalOptions="Center" VerticalOptions="Center" TextColor="{StaticResource TextColorBlue}" />
<Label Text="20" FontAttributes="Bold" FontSize="25" Grid.Row="1" Grid.Column="0" HorizontalOptions="Center" VerticalOptions="Center" TextColor="{StaticResource TextColorBlue}" />
<Label Text="2017" FontAttributes="Bold" FontSize="25" Grid.Row="1" Grid.Column="1" HorizontalOptions="Center" VerticalOptions="Center" TextColor="{StaticResource TextColorBlue}" />
</Grid>
</StackLayout>
<Frame.GestureRecognizers>
<TapGestureRecognizer NumberOfTapsRequired="1" Tapped="Handle_Tapped_DatePicker" />
</Frame.GestureRecognizers>
</Frame>
cs part
void Handle_Tapped_DatePicker(object sender, System.EventArgs e)
{
Debug.WriteLine("Handle_Tapped_DatePicker");
if (datePicker.IsFocused)
{
Debug.WriteLine("Yes, datePicker is focused");
datePicker.Unfocus();
}
datePicker.Focus();
}
void Handle_DateSelected(object sender, Xamarin.Forms.DateChangedEventArgs e)
{
Debug.WriteLine("e.NewDate: " + e.NewDate.ToString());
}
But nothing happening here. The datePicker is not showing. I am testing on iOS simulator. Please help me on this.

Answer 1

Thankfully I got the answer after some searches.
The thing is that, You need to bring the focus of datePicker through the device main UI thread. I have changed my code like this.
Device.BeginInvokeOnMainThread(() =>
{
if (datePicker.IsFocused)
datePicker.Unfocus();
datePicker.Focus();
});