Keyboard flashes when navigating in Shell flyouts - xamarin.forms

Question

My Xamarin.Forms app is using Shell flyouts for navigation. When I navigate the app on iOS, I notice a strange behaviour. Reproduction steps:
Go to a page that has an Entry in it
Type anything into the Entry
Go to another page
Return to the same page you typed something into the Entry
The keyboard then pops up and then disappears right after. I can see the cursor in the Entry appear then disappear too. I removed a lot of my code to try to find the problem, but I can not find it. My code:
AppShell.xaml:
<Shell xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:MyApp.Views"
Title="MyApp"
x:Name="shellAppShell"
x:Class="MyApp.AppShell">
<FlyoutItem x:Name="flyoutItemMainPage" Title="Home" Icon="icon_about.png">
<ShellContent x:Name="shellContentMainPage" Route="MainPage" ContentTemplate="{DataTemplate local:MainPage}" />
</FlyoutItem>
<FlyoutItem x:Name="flyoutItemAPage" Title="A Page" Icon="Pagea.png">
<ShellContent x:Name="shellContentPageA" Route="PageA" ContentTemplate="{DataTemplate local:PageA}" />
</FlyoutItem>
<!-- More flyouts... -->
</Shell>
PageA.xaml:
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Name="PageA"
x:Class="MyApp.Views.PageA">
<ContentPage.Content>
<StackLayout Orientation="Vertical" >
<Entry />
<Button Text="back" Clicked="OnBackClicked"/>
</StackLayout>
</ContentPage.Content>
</ContentPage>
PageA.xaml.cs
public partial class PageA : ContentPage
{
public PageA()
{
InitializeComponent();
}
void OnBackClicked(object sender, EventArgs e)
{
Shell.Current.CurrentItem = AppShellGlobal.ShellContentMainPage;
}
}

Answer 1

After my testing, this situation only occurs in iOS.
There is a simpler solution, you can rewrite the ContentPage and end the editing state of the page when the page loads.
First, create the MyPageRenderer class in your project's xxx.iOS directory.
Here is the internal code:
[assembly: ExportRenderer(typeof(ContentPage), typeof(MyPageRenderer))]
namespace App15.iOS
{
public class MyPageRenderer : PageRenderer
{
public override void ViewDidAppear(bool animated)
{
View.EndEditing(true);//Solved the problem with this line of code
base.ViewDidAppear(animated);
}
}
}
Here is the screenshot: