xaml – Xamarin在iOS上的TabbedPage中形成辅助ToolbarItem

我的应用程序在iOS上表现得非常奇怪,我有一个带有3个选项卡的TabPage.
在第一个图像上,您可以看到我在第一个Tab上有4个Secondary ToolbarItems.奇怪的是在带有Map的Page上我没有Secondary ToolbarItem,NavigationBar和Map之间的空间仍然存在.
有没有人知道如何解决这个问题,或者这是否是Xamarin的Bug？

NavPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<TabbedPage xmlns="http://xamarin.com/scheR_395_11845@as/2014/forms"
            xmlns:x="http://scheR_395_11845@as.microsoft.com/winfx/2009/xaml"
            xmlns:view="clr-namespace:CarPar.View;assembly=CarPar"
            x:Class="CarPar.Navigation.NavPage"
            title = "{Binding PagetitlE}">

  <view:HomePage />
  <view:MapPage />
  <view:FavoritePage />

</TabbedPage>

HomePage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/scheR_395_11845@as/2014/forms"
             xmlns:x="http://scheR_395_11845@as.microsoft.com/winfx/2009/xaml"
             xmlns:view="clr-namespace:CarPar.View;assembly=CarPar"
             x:Class="CarPar.View.HomePage"
             title="City"
             Icon="home.png">
    <ContentPage.ToolbarItems>
        <ToolbarItem Text="Alphabetisch" />
        <ToolbarItem Text="Freie Plätze" />
        <ToolbarItem Text="Prozent frei" />
        <ToolbarItem Text="Entfernung" />
    </ContentPage.ToolbarItems>
    <StackLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
        <SearchBar Placeholder="Parkhaus suchen" Text="{Binding SearchText}" />
    ...
    <StackLayout>
</ContentPage>

@H_733_7@mapPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/scheR_395_11845@as/2014/forms"
             xmlns:x="http://scheR_395_11845@as.microsoft.com/winfx/2009/xaml"
             xmlns:maps="clr-namespace:Xamarin.Forms.Maps;assembly=Xamarin.Forms.Maps"
             x:Class="CarPar.View.MapPage"
             title="Karte"
             Icon="map.png">
    <ContentPage.Content>
        <StackLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
            <maps:Map x:Name="ParkingMap"
          IsShowingUser="True"
          MapType="Street"/>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

public MySecondPage()
    {
        InitializeComponent();
        NavigationPage.SetHasNavigationBar(this,falsE);  // Hide nav bar
    }