那些遇到过的问题

在 Xamarin.Forms 中，将 ScrollView 添加到页面后，所有单击事件都停止工作。ScrollView 是否拦截了点击？

Kri*_*aig 5 c# android xamarin.android xamarin xamarin.forms

这是有问题的相关代码：

XAML：

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Name="ContentPage_MainPage"
             x:Class="OpenBacon.MainPage">

    <ContentPage.ToolbarItems>
        <ToolbarItem x:Name="ToolbarItem_Subreddits" Order="Primary" Priority="10" Text="Initializing...." Clicked="ToolbarItemSubreddits_Clicked" />
        <ToolbarItem x:Name="ToolbarItem_Spacer" Order="Primary" Priority="20" Text="     " />
        <ToolbarItem Order="Primary" Priority="30" Clicked="ToolbarItemSearch_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconSearch" />
            </ToolbarItem.Icon>
        </ToolbarItem>
        <ToolbarItem x:Name="ToolbarItem_Mail" Order="Primary" Priority="40" Clicked="ToolbarItemMail_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconMail" />
            </ToolbarItem.Icon>
        </ToolbarItem>
        <ToolbarItem Order="Primary" Priority="50" Clicked="ToolbarItemBaconButton_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconBaconButton" />
            </ToolbarItem.Icon>
        </ToolbarItem>
    </ContentPage.ToolbarItems>
    <ContentPage.Content>
        <AbsoluteLayout Padding="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <ScrollView x:FieldModifier="public" x:Name="ScrollView_Main" Orientation="Vertical">
                <StackLayout x:Name="StackLayout_Main">
                    <!-- Sort bar. -->
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                        </Grid.RowDefinitions>
                        <Grid Grid.Row="0" VerticalOptions="Start" BackgroundColor="LightGray" RowSpacing="0">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="2*" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>
                            <Label Grid.Column="0" Text="" FontSize="Small" VerticalOptions="End" Margin="2" x:Name="Label_PostsSinceLastRefresh" />
                            <Button x:Name="ButtonSort" Grid.Column="1" Text="" FontSize="Small" Clicked="ButtonSort_Clicked" />
                        </Grid>
                    </Grid>
                    <!-- Posts list goes here (generated). -->
                    <StackLayout VerticalOptions="StartAndExpand" x:Name="StackLayout_Posts">

                    </StackLayout>
                </StackLayout>
            </ScrollView>
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C＃：

（在 MainPage 的构造函数中）

Content = ScrollView_Main;
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如果我注释掉“Content =”行，ScrollView 就会消失，但所有工具栏项都能够再次接收其单击事件。未注释，滚动效果很好，但我无法点击页面上的任何内容。

我找不到任何提及修复此行为的选项。这是 Xamarin.Forms 错误还是我遗漏了什么？

编辑： 这是完整的 XAML：

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Name="ContentPage_MainPage"
             x:Class="OpenBacon.MainPage">

    <ContentPage.ToolbarItems>
        <ToolbarItem x:Name="ToolbarItem_Subreddits" Order="Primary" Priority="10" Text="Initializing...." Clicked="ToolbarItemSubreddits_Clicked" />
        <ToolbarItem x:Name="ToolbarItem_Spacer" Order="Primary" Priority="20" Text="     " />
        <ToolbarItem Order="Primary" Priority="30" Clicked="ToolbarItemSearch_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconSearch" />
            </ToolbarItem.Icon>
        </ToolbarItem>
        <ToolbarItem x:Name="ToolbarItem_Mail" Order="Primary" Priority="40" Clicked="ToolbarItemMail_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconMail" />
            </ToolbarItem.Icon>
        </ToolbarItem>
        <ToolbarItem Order="Primary" Priority="50" Clicked="ToolbarItemBaconButton_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconBaconButton" />
            </ToolbarItem.Icon>
        </ToolbarItem>
    </ContentPage.ToolbarItems>
    <ContentPage.Content>
        <AbsoluteLayout Padding="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <ScrollView x:FieldModifier="public" x:Name="ScrollView_Main" Orientation="Vertical">
                <StackLayout x:Name="StackLayout_Main">
                    <!-- Sort bar. -->
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                        </Grid.RowDefinitions>
                        <Grid Grid.Row="0" VerticalOptions="Start" BackgroundColor="LightGray" RowSpacing="0">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="2*" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>
                            <Label Grid.Column="0" Text="" FontSize="Small" VerticalOptions="End" Margin="2" x:Name="Label_PostsSinceLastRefresh" />
                            <Button x:Name="ButtonSort" Grid.Column="1" Text="" FontSize="Small" Clicked="ButtonSort_Clicked" />
                        </Grid>
                    </Grid>
                    <!-- Posts list goes here (generated). -->
                    <StackLayout VerticalOptions="StartAndExpand" x:Name="StackLayout_Posts">

                    </StackLayout>
                </StackLayout>
            </ScrollView>

            <ContentView x:Name="Popup_Subreddits" BackgroundColor="DimGray" Padding="10, 10" IsVisible="False" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
                <StackLayout VerticalOptions="Start"  HorizontalOptions="Center">
                    <StackLayout Orientation="Vertical" HeightRequest="400" WidthRequest="300" BackgroundColor="White">
                        <ListView x:Name="ListView_Subreddits" ItemTapped="ListView_Subreddits_ItemTapped">
                            <ListView.ItemsSource>
                                <x:Array Type="{x:Type x:String}"></x:Array>
                            </ListView.ItemsSource>
                        </ListView>
                    </StackLayout>
                </StackLayout>
                <ContentView.GestureRecognizers>
                    <TapGestureRecognizer Tapped="Popup_Subreddits_OutClick" />
                </ContentView.GestureRecognizers>
            </ContentView>
            <ContentView x:Name="Popup_BaconButton" BackgroundColor="#446"  Padding="75, 0, 0, 75" IsVisible="False" AbsoluteLayout.LayoutBounds="1, 0, .9, .9" AbsoluteLayout.LayoutFlags="All">
                <StackLayout VerticalOptions="Start"  HorizontalOptions="Center">
                    <StackLayout Orientation="Vertical" HeightRequest="600" WidthRequest="300" BackgroundColor="#0079D3">
                        <ListView x:Name="ListView_BaconButton" ItemTapped="ListView_BaconButton_ItemTapped">
                            <ListView.ItemTemplate>
                                <DataTemplate>
                                    <ImageCell Text="{Binding Name}" Detail="{Binding Detail}" ImageSource="{Binding ImageSrc}" TextColor="White" DetailColor="WhiteSmoke" />
                                </DataTemplate>
                            </ListView.ItemTemplate>
                        </ListView>
                    </StackLayout>
                </StackLayout>
                <ContentView.GestureRecognizers>
                    <TapGestureRecognizer Tapped="Popup_BaconButton_OutClick" />
                </ContentView.GestureRecognizers>
            </ContentView>
        </AbsoluteLayout>
    </ContentPage.Content>

</ContentPage>
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Kri*_*aig 0

我终于在这里找到了问题的解决方案：

https://forums.xamarin.com/discussion/comment/373736/#Comment_373736

显然，我需要做的就是将以下内容添加到 ScrollView 定义中：

AbsoluteLayout.LayoutBounds="0, 0, 1, 1"

AbsoluteLayout.LayoutFlags =“全部”

IE

<ScrollView 
    x:FieldModifier="public" 
    x:Name="ScrollView_Main" 
    Orientation="Vertical" 
    AbsoluteLayout.LayoutBounds="0, 0, 1, 1" 
    AbsoluteLayout.LayoutFlags="All">
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所以完整的 XAML 现在看起来像这样：

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Name="ContentPage_MainPage"
             x:Class="OpenBacon.MainPage">

    <ContentPage.ToolbarItems>
        <ToolbarItem x:Name="ToolbarItem_Subreddits" Order="Primary" Priority="10" Text="Initializing...." Clicked="ToolbarItemSubreddits_Clicked" />
        <ToolbarItem x:Name="ToolbarItem_Spacer" Order="Primary" Priority="20" Text="     " />
        <ToolbarItem Order="Primary" Priority="30" Clicked="ToolbarItemSearch_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconSearch" />
            </ToolbarItem.Icon>
        </ToolbarItem>
        <ToolbarItem x:Name="ToolbarItem_Mail" Order="Primary" Priority="40" Clicked="ToolbarItemMail_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconMail" />
            </ToolbarItem.Icon>
        </ToolbarItem>
        <ToolbarItem Order="Primary" Priority="50" Clicked="ToolbarItemBaconButton_Clicked">
            <ToolbarItem.Icon>
                <OnPlatform x:TypeArguments="FileImageSource"  Android="OpenBaconBaconButton" />
            </ToolbarItem.Icon>
        </ToolbarItem>
    </ContentPage.ToolbarItems>
    <ContentPage.Content>
        <AbsoluteLayout Padding="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <ScrollView x:FieldModifier="public" x:Name="ScrollView_Main" Orientation="Vertical" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
                <StackLayout x:Name="StackLayout_Main">
                    <!-- Sort bar. -->
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                        </Grid.RowDefinitions>
                        <Grid Grid.Row="0" VerticalOptions="Start" BackgroundColor="LightGray" RowSpacing="0">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="2*" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>
                            <Label Grid.Column="0" Text="" FontSize="Small" VerticalOptions="End" Margin="2" x:Name="Label_PostsSinceLastRefresh" />
                            <Button x:Name="ButtonSort" Grid.Column="1" Text="" FontSize="Small" Clicked="ButtonSort_Clicked" />
                        </Grid>
                    </Grid>
                    <!-- Posts list goes here (generated). -->
                    <StackLayout VerticalOptions="StartAndExpand" x:Name="StackLayout_Posts">

                    </StackLayout>
                </StackLayout>
            </ScrollView>

            <ContentView x:Name="Popup_Subreddits" BackgroundColor="DimGray" Padding="10, 10" IsVisible="False" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
                <StackLayout VerticalOptions="Start"  HorizontalOptions="Center">
                    <StackLayout Orientation="Vertical" HeightRequest="400" WidthRequest="300" BackgroundColor="White">
                        <ListView x:Name="ListView_Subreddits" ItemTapped="ListView_Subreddits_ItemTapped">
                            <ListView.ItemsSource>
                                <x:Array Type="{x:Type x:String}"></x:Array>
                            </ListView.ItemsSource>
                        </ListView>
                    </StackLayout>
                </StackLayout>
                <ContentView.GestureRecognizers>
                    <TapGestureRecognizer Tapped="Popup_Subreddits_OutClick" />
                </ContentView.GestureRecognizers>
            </ContentView>
            <ContentView x:Name="Popup_BaconButton" BackgroundColor="#446"  Padding="75, 0, 0, 75" IsVisible="False" AbsoluteLayout.LayoutBounds="1, 0, .9, .9" AbsoluteLayout.LayoutFlags="All">
                <StackLayout VerticalOptions="Start"  HorizontalOptions="Center">
                    <StackLayout Orientation="Vertical" HeightRequest="600" WidthRequest="300" BackgroundColor="#0079D3">
                        <ListView x:Name="ListView_BaconButton" ItemTapped="ListView_BaconButton_ItemTapped">
                            <ListView.ItemTemplate>
                                <DataTemplate>
                                    <ImageCell Text="{Binding Name}" Detail="{Binding Detail}" ImageSource="{Binding ImageSrc}" TextColor="White" DetailColor="WhiteSmoke" />
                                </DataTemplate>
                            </ListView.ItemTemplate>
                        </ListView>
                    </StackLayout>
                </StackLayout>
                <ContentView.GestureRecognizers>
                    <TapGestureRecognizer Tapped="Popup_BaconButton_OutClick" />
                </ContentView.GestureRecognizers>
            </ContentView>
        </AbsoluteLayout>
    </ContentPage.Content>

</ContentPage>
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正如您所看到的，它与我的问题中的代码相同，除了这两个属性被添加到 ScrollView 定义中。这解决了一切。

以下是它现在的一些屏幕截图：

屏幕截图#1

截图#2

屏幕截图#3（代码稍作修改）

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