单击其他控件下的控件

我有一个Xamarin Forms页面，最后我有一个覆盖整个屏幕的StackLayout，只有在我调用它时才能看到 .

StackLayout正确显示，ActivityIndicator也是如此 . 但是我仍然可以点击任何技术上应该在stacklayout下面的控件 .

这是预期的行为吗？在WPF或类似的情况下，当我将控件放在另一个控件之前时，它不允许单击它后面的任何控件 .

XAML：

<Grid>
      <Grid.RowDefinitions>
          <RowDefinition Height="*" />
          <RowDefinition Height="Auto" />
      </Grid.RowDefinitions>
      <Grid.ColumnDefinitions>
          <ColumnDefinition Width="*" />
      </Grid.ColumnDefinitions>

      <Image Source="Background.png" Aspect="AspectFill"></Image>
      <StackLayout Padding="10, 10, 0, 0">
          <Image Source="Logo.png" WidthRequest="200" HorizontalOptions="Start" />
      </StackLayout>
      <RelativeLayout>
      <StackLayout x:Name="ContentContainer" BackgroundColor="Black" Opacity="0.7" Orientation="Vertical"
               RelativeLayout.XConstraint=
             "{ConstraintExpression Type=RelativeToParent,
                                    Property=Width,
                                    Factor=0}"
               RelativeLayout.YConstraint=
             "{ConstraintExpression Type=RelativeToParent,
                                    Property=Height,
                                    Factor=0.33}"
               RelativeLayout.WidthConstraint=
             "{ConstraintExpression Type=RelativeToParent,
                                    Property=Width,
                                    Factor=1.00}"
               RelativeLayout.HeightConstraint=
             "{ConstraintExpression Type=RelativeToParent,
                                    Property=Height,
                                    Factor=0.33}" >
           <StackLayout x:Name="ControlContainer" Orientation="Vertical" VerticalOptions="CenterAndExpand" >
           <Entry x:Name="EmailInput" VerticalOptions="Center" Placeholder="Email" HorizontalOptions="Fill"  />
           <Entry x:Name="PasswordInput" VerticalOptions="Center"  Placeholder="Password" HorizontalOptions="Fill" IsPassword="true" />
        </StackLayout>
      </StackLayout>
    </RelativeLayout>
    <Grid Grid.Row="1" RowSpacing="0" ColumnSpacing="0">
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="2*" />
        <ColumnDefinition Width="2*" />
      </Grid.ColumnDefinitions>
      <Button x:Name="LoginButton" Text="Login" BackgroundColor="#FFCF3838" HorizontalOptions="FillAndExpand" Grid.Column="1" Grid.Row="0" BorderWidth="1" BorderColor="White" IsEnabled="{Binding Path=LoginViewModel.IsPageEnabled}" />
      <Button x:Name="RegisterButton" Text="Register" HorizontalOptions="Fill" BackgroundColor="#FFCF3838" Grid.Column="0" Grid.Row="0" BorderWidth="1" BorderColor="White" IsEnabled="{Binding Path=LoginViewModel.IsPageEnabled}" />
    </Grid>

    <StackLayout x:Name="LoadingContainer" BackgroundColor="Black" Opacity="0.7" Orientation="Vertical" IsVisible="{Binding Path=LoginViewModel.IsBusy}"
               RelativeLayout.XConstraint=
             "{ConstraintExpression Type=RelativeToParent,
                                    Property=Width,
                                    Factor=0}"
               RelativeLayout.YConstraint=
             "{ConstraintExpression Type=RelativeToParent,
                                    Property=Height,
                                    Factor=0}"
               RelativeLayout.WidthConstraint=
             "{ConstraintExpression Type=RelativeToParent,
                                    Property=Width,
                                    Factor=0}"
               RelativeLayout.HeightConstraint=
             "{ConstraintExpression Type=RelativeToParent,
                                    Property=Height,
                                    Factor=0}" >
      <StackLayout HeightRequest="70" VerticalOptions="CenterAndExpand">
        <ActivityIndicator IsVisible="{Binding Path=LoginViewModel.IsBusy}"
                         IsRunning="{Binding Path=LoginViewModel.IsBusy}"
                         VerticalOptions="Center"
                         HorizontalOptions="CenterAndExpand"
                         Color="{x:Static common:ColorResources.ActivityIndicatorColor}"
                         RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent,
                                Property=Height,
                                Factor=0.33}"
                         RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent,
                                Property=Height,
                                Factor=0.33}" />
        <Label Text="Loading ..." Font="12" TextColor="White" VerticalOptions="Center" HorizontalOptions="Center"></Label>
      </StackLayout>
    </StackLayout>
</Grid>

StackLayout在开始时isVisible =“false”，内容和按钮都可见且工作正常 . 当isVisible变为true时，StackLayout将使用ActivityIndicator覆盖屏幕 . 如上所述，一切都运行良好但我仍然可以点击最初显示的任何按钮，即使我可以看到StackLayout完全覆盖并位于屏幕顶部 .