提问人：Marcel Delhaye 提问时间：8/7/2023 最后编辑：Marcel Delhaye 更新时间：8/17/2023 访问量：136
Xamarin.forms：ListView 中的 SwipeView 问题
Xamarin.forms: Problem with SwipeView in a ListView
问：
我的 Xamarin.Forms 应用程序包含一个 Listview。目前，用户可以通过选择此项在列表视图中查看此项的详细信息。我想使用滑动功能，而不是选择查看项目的详细信息。为此，我使用了 SwipeItem 函数，如 Xamarin.Forms SwipeView 页上的 Microsoft 所述（链接 https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/swipeview）。下面是我的应用的 xaml 代码：
<?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"
xmlns:fab="clr-namespace:Refractored.FabControl;assembly=Refractored.FabControl"
xmlns:local="clr-namespace:ButtonCircle.FormsPlugin.Abstractions;assembly=ButtonCircle.FormsPlugin.Abstractions"
xmlns:local1="clr-namespace:MemoCourses.ViewModels"
xmlns:input="clr-namespace:Plugin.InputKit.Shared.Controls;assembly=Plugin.InputKit"
xmlns:syncfusion="clr-namespace:Syncfusion.SfNumericTextBox.XForms;assembly=Syncfusion.SfNumericTextBox.XForms"
xmlns:helpers="clr-namespace:MemoCourses.Helpers"
mc:Ignorable="d"
x:Class="MemoCourses.Views.Panier_achatsPage"
Title="{helpers:Translate Panier_achatsPage_Titre}">
<ContentPage.ToolbarItems>
<!--<ToolbarItem x:Name ="menuEmpty" Text="Vider le panier" Order="Secondary" Clicked="menuEmpty_Clicked"/>-->
<ToolbarItem x:Name ="menuEmptyAll" Text="{helpers:Translate Panier_achatsPage_Menu01}" Order="Secondary" Clicked="menuEmptyAll_Clicked"/>
<ToolbarItem x:Name ="menuAddFavoris" Text="{helpers:Translate Panier_achatsPage_Menu02}" Order="Secondary" Clicked="menuAddFavoris_Clicked"/>
<ToolbarItem x:Name ="menuSendMail" Text="{helpers:Translate Panier_achatsPage_Menu03}" Order="Secondary" Clicked="menuSendMail_Clicked"/>
<ToolbarItem x:Name ="menuViewCard" Text="{helpers:Translate Panier_achatsPage_Menu04}" Order="Secondary" Clicked="menuViewCard_Clicked"/>
<ToolbarItem x:Name= "menuLockScreen" Text="{helpers:Translate Panier_achatsPage_Menu05}" Order="Secondary" Clicked="menuLockScreen_Clicked"/>
<ToolbarItem x:Name= "menuUnLockScreen" Text="{helpers:Translate Panier_achatsPage_Menu06}" Order="Secondary" Clicked="menuUnLockScreen_Clicked"/>
<ToolbarItem x:Name= "menuBlockModif" Text="{helpers:Translate Panier_achatsPage_Menu07}" Order="Secondary" Clicked="menuBlockModif_Clicked"/>
<ToolbarItem x:Name= "menuUnLockModif" Text="{helpers:Translate Panier_achatsPage_Menu08}" Order="Secondary" Clicked="menuUnLockModif_Clicked"/>
</ContentPage.ToolbarItems>
<Page.Resources>
<local1:ImageConverter x:Key="ImageConverter" />
</Page.Resources>
<AbsoluteLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<Grid AbsoluteLayout.LayoutFlags="All"
AbsoluteLayout.LayoutBounds="0,1,1,1">
<ListView x:Name="PanierListView"
HasUnevenRows="True"
IsGroupingEnabled="true"
Margin="0,0,0,60"
VerticalOptions="FillAndExpand"
AbsoluteLayout.LayoutFlags="All"
AbsoluteLayout.LayoutBounds="0,0,1,1"
CachingStrategy="RecycleElement"
ItemSelected="PanierListView_ItemSelected">
<ListView.GroupHeaderTemplate>
<DataTemplate>
<ViewCell>
<StackLayout BackgroundColor="LightGray">
<Label Text="{Binding Key}" Margin="0,6,0,0" HorizontalOptions="Center" VerticalOptions="Center" FontSize="Small" HeightRequest="30" VerticalTextAlignment="Center" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.GroupHeaderTemplate>
<!--Built in Cells-->
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<SwipeView>
<SwipeView.LeftItems>
<SwipeItems>
<SwipeItem
Text="Edit"
IconImageSource="edit.png"
BackgroundColor="DarkSeaGreen"
Invoked="OnEditSwipeItem_Invoked" />
</SwipeItems>
</SwipeView.LeftItems>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="45*" />
<ColumnDefinition Width="8*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="60" />
</Grid.RowDefinitions>
<StackLayout Orientation="Horizontal" VerticalOptions="Center" Padding="3" Grid.Column="0">
<Image Source="{Binding ImageArt, Converter={StaticResource ImageConverter}}"
Margin="10,0,0,0"
WidthRequest="45"
HeightRequest="45"
VerticalOptions="Start"
Grid.Column="0"/>
<StackLayout Orientation="Vertical">
<Label Text="{Binding Name}"
Margin="10,-4,0,0" FontSize="{Binding NameFontSize}" TextColor="Black"
FontAttributes="None"
VerticalOptions="Start"
MaxLines="1"
LineBreakMode="TailTruncation"
Grid.Column="0"/>
<Grid Margin="0,0,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="280*" />
<ColumnDefinition Width="70*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="30" />
</Grid.RowDefinitions>
<StackLayout Orientation="Horizontal" Margin="0,-5,0,0" Grid.Column="0">
<Label Text="{Binding QteArt}" Margin="10,0,0,0" />
<Label Text="{Binding UniteMesure}" />
<Label Text="{Binding Separator}" />
<Label Text="{Binding Note}" LineBreakMode="TailTruncation" MaxLines="1"/>
</StackLayout>
<syncfusion:SfNumericTextBox
x:Name="totalart"
Value="{Binding TotalArt}"
IsVisible="{Binding TotalVisible}"
MaximumNumberDecimalDigits="2"
FormatString="0.00 €"
Margin="0,-15,0,0"
HorizontalOptions="End"
VerticalOptions="Start"
IsReadOnly="True"
FontSize="Small"
Grid.Column="1"
/>
</Grid>
</StackLayout>
</StackLayout>
<input:CheckBox Grid.Column="1"
x:Name="chkBoxPanierOut"
IsChecked="{Binding IsChk, Mode=TwoWay}"
Type="Check"
Color="Green"
BoxSizeRequest="28"
BindingContext="{Binding .}"
VerticalOptions="Center"
Margin="10,0,20,0"
CheckChanged="chkBoxPanierOut_CheckChanged">
</input:CheckBox>
</Grid>
</SwipeView>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.Footer>
<StackLayout Orientation="Vertical">
<Label Text=" "/>
<Label Text=" "/>
<Label Text=" "/>
</StackLayout>
</ListView.Footer>
</ListView>
<Grid HorizontalOptions="StartAndExpand" VerticalOptions="StartAndExpand">
<Image x:Name="ImgListEmpty"
Opacity="0.7"
IsVisible="false"
Aspect="Fill"
Source="Avertissement_7.png"/>
<Label x:Name="AdvertListEmpty1"
IsVisible="false"
FontSize="Medium"
TextColor="White"
FontAttributes="Italic"
Text="{helpers:Translate Panier_achatsPage_Avert01}"
VerticalOptions="Center"
HorizontalOptions="Center"
Margin=" 0,-30,0,0"/>
<Label x:Name="AdvertListEmpty2"
IsVisible="false"
FontSize="Medium"
TextColor="White"
FontAttributes="Italic"
Text="{helpers:Translate Panier_achatsPage_Avert02}"
VerticalOptions="Center"
HorizontalOptions="Center"
Margin=" 0,30,0,0"/>
<Image x:Name="ImgCartFull"
Opacity="0.7"
IsVisible="false"
Aspect="Fill"
Source="Avertissement_6.png"/>
<Label x:Name="AdvertCartFull"
IsVisible="false"
FontSize="Medium"
TextColor="White"
FontAttributes="Italic"
Text="{helpers:Translate Panier_achatsPage_Avert03}"
VerticalOptions="Center"
HorizontalOptions="Center"/>
<Label x:Name="TextFavEmptyL1"
IsVisible="false"
FontSize="Medium"
TextColor="White"
FontAttributes="Italic"
Text="{helpers:Translate Panier_achatsPage_Avert04}"
VerticalOptions="Center"
HorizontalOptions="Center"
Margin=" 0,-30,0,0"/>
<Label x:Name="TextFavEmptyL2"
IsVisible="false"
FontSize="Medium"
TextColor="White"
FontAttributes="Italic"
Text="{helpers:Translate Panier_achatsPage_Avert05}"
VerticalOptions="Center"
HorizontalOptions="Center"
Margin=" 0,30,0,0"/>
</Grid>
<local:CircleButton
FontIcon="Material"
Icon="add"
FontSize="Large" TextColor="White"
HeightRequest="60" WidthRequest="60"
CornerRadius="30"
HorizontalOptions="End"
VerticalOptions="End"
Margin="0,0,20,40"
Clicked="FabBtnAdd_clicked"
BackgroundColor="#5E91FF"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize">
</local:CircleButton>
<local:CircleButton x:Name="CircleBtnLock"
FontIcon="Material"
Icon="md-lock"
FontSize="Medium" TextColor="White"
HeightRequest="30" WidthRequest="30"
CornerRadius="30"
HorizontalOptions="End"
VerticalOptions="End"
Margin="0,0,110,55"
Clicked="CircleBtnLock_clicked"
BackgroundColor="IndianRed"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize">
</local:CircleButton>
<local:CircleButton x:Name="CircleBtnStopModif"
FontIcon="Material"
Icon="md-edit"
FontSize="Medium" TextColor="White"
HeightRequest="30" WidthRequest="30"
CornerRadius="30"
HorizontalOptions="End"
VerticalOptions="End"
Margin="0,0,165,55"
Clicked="CircleBtnStopModif_Clicked"
BackgroundColor="IndianRed"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize">
</local:CircleButton>
<local:CircleButton x:Name="CircleBtnUnLockModif"
FontIcon="Material"
Icon="md-edit"
IsVisible="false"
FontSize="Medium" TextColor="White"
HeightRequest="30" WidthRequest="30"
CornerRadius="30"
HorizontalOptions="End"
VerticalOptions="End"
Margin="0,0,165,55"
Clicked="CircleBtnUnLockModif_Clicked"
BackgroundColor="YellowGreen"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize">
</local:CircleButton>
<Label Text="{helpers:Translate Panier_achatsPage_L01}"
x:Name="totaltxt"
Margin="75,0,0,20"
VerticalOptions="End"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize"
FontSize="Medium"
FontAttributes="Bold"
IsVisible="true"/>
<Label x:Name="totalAchats"
Text=""
Margin="145,0,0,20"
VerticalOptions="End"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize"
FontSize="Medium"
FontAttributes="Bold"
IsVisible="true"/>
<Label Text=" €"
x:Name="devisetxt"
Margin="210,0,0,20"
VerticalOptions="End"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize"
FontSize="Medium"
FontAttributes="Bold"
IsVisible="true"/>
<Grid HorizontalOptions="StartAndExpand" VerticalOptions="StartAndExpand">
<Image x:Name="fondAI"
Opacity="0.8"
IsVisible="true"
Aspect="Fill"
Source="FondProgressRing.png"/>
<local:CircleButton x:Name="CircleBtnUnLock"
FontIcon="Material"
Icon="md-lock-open"
IsVisible="true"
FontSize="Medium" TextColor="White"
HeightRequest="30" WidthRequest="30"
CornerRadius="30"
HorizontalOptions="End"
VerticalOptions="End"
Margin="0,0,110,55"
Clicked="CircleBtnUnLock_clicked"
BackgroundColor="Green"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="1, 1, AutoSize, AutoSize">
</local:CircleButton>
</Grid>
</Grid>
</AbsoluteLayout>
</ContentPage>
这是操作FabBtnAdd_clicked的代码隐藏
private async void FabBtnAdd_clicked(object sender, EventArgs e)
{
DB_ListeAchatsList = dblisteachats.GetAllListeAchats();
var listeachats = DB_ListeAchatsList.Where(x => x.NomListe == App.currentListeAchat).FirstOrDefault();
//
var artpanierpage = new ArtPanierPage();
artpanierpage.BindingContext = listeachats;
await Navigation.PushAsync(artpanierpage);
}
不幸的是，我在运行它时遇到了问题。当 Listview 为空时，将打开 XAML 页，我可以通过点击 + 按钮来添加项。但是，如果存在项目，程序将崩溃而不会显示错误消息。退出窗口中只有以下内容：
[libc]致命信号 11 （SIGSEGV）、代码 1 （SEGV_MAPERR）、故障地址0x4 TID 12730 （oft.memocourses）、pid 12730 （oft.memocourses）
我在网站上找到了其他开发人员给出的示例，总的来说，它看起来像我的代码。我不明白发生了什么。谢谢你的帮助。
答：
0赞
Marcel Delhaye
8/17/2023
#1
我将 Xamarin.Essentials 更新到版本 1.7.0，将 Xamarin.Forms 更新到版本 5.0.0.2196，从那时起，应用不再崩溃，并且 SwipeView 可以正常工作（SwipeView 命令除外，该命令不再接受 Threshold 参数）。该更新还产生了其他问题，但由于它没有带回 Swipeview，所以我会问一个新问题。谢谢。
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