change barcolor Flyout xamarin xaml - xaml

Question

somebody knows how to change the bar color, that I point out in the image
bar flyout

Answer 1

If you want to change the background color of Navigation Bar in shell , we could set the style of Shell navigation bar in Resource Dictionary .
<Shell.Resources>
<ResourceDictionary>
<Color x:Key="NavigationPrimary">#2196F3</Color>
<Style x:Key="BaseStyle" TargetType="Element">
<Setter Property="Shell.BackgroundColor" Value="Red" /> // set navigation bar color here
<Setter Property="Shell.ForegroundColor" Value="Blue" />
<Setter Property="Shell.TitleColor" Value="Blue" />
<Setter Property="Shell.DisabledColor" Value="#B4FFFFFF" />
<Setter Property="Shell.UnselectedColor" Value="#95FFFFFF" />
<Setter Property="Shell.TabBarBackgroundColor" Value="{StaticResource NavigationPrimary}" />
<Setter Property="Shell.TabBarForegroundColor" Value="White"/>
<Setter Property="Shell.TabBarUnselectedColor" Value="#95FFFFFF"/>
<Setter Property="Shell.TabBarTitleColor" Value="White"/>
</Style>
<Style TargetType="TabBar" BasedOn="{StaticResource BaseStyle}" />
</ResourceDictionary>
</Shell.Resources>

Answer 2

For NavigationPage (I assume your detail page is composed of a NavigationPage and inside your HomePage or CurrentNavigatedPageFromMenu, here is a simple style :
<Style x:Key="NavigationPageStyle" TargetType="NavigationPage">
<Setter Property="BarBackgroundColor" Value="Red" />
<Setter Property="BarTextColor" Value="White" />
</Style>
<Style BasedOn="{StaticResource NavigationPageStyle}" TargetType="NavigationPage" />
I separate them to allow to reuse the style on other Navigation page control I've extended.
In code behind, in the constructor of your page (can be usefull to provide a different color depend on the page you are, exemple : red for error page, green for parameter, blue for others).
((NavigationPage)Application.Current.MainPage).BarBackgroundColor = Color.Red;
((NavigationPage)Application.Current.MainPage).BarTextColor = Color.White;
You can find some usefull tips [Xamarin Forum too][1].