Xamarin.forms 如何在Xamarin表单中展开和折叠ListView
我是Xamarin表单的新手,我知道有很多有用的控件。我正在寻找一个控件,它可以扩展以在网格中显示数据,如下面的示例所示 更新 型号:Xamarin.forms 如何在Xamarin表单中展开和折叠ListView,xamarin.forms,xamarin.forms.listview,Xamarin.forms,Xamarin.forms.listview,我是Xamarin表单的新手,我知道有很多有用的控件。我正在寻找一个控件,它可以扩展以在网格中显示数据,如下面的示例所示 更新 型号: public class Phone { public string mobile { get; set; } public string home { get; set; } public string office { get; set; } } public class Contact { public string i
public class Phone
{
public string mobile { get; set; }
public string home { get; set; }
public string office { get; set; }
}
public class Contact
{
public string id { get; set; }
public string name { get; set; }
public string email { get; set; }
public string address { get; set; }
public string gender { get; set; }
public Phone phone { get; set; }
}
public class ContactList
{
public List<Contact> contacts { get; set; }
}
公共类电话
{
公共字符串mobile{get;set;}
公共字符串home{get;set;}
公共字符串办公室{get;set;}
}
公共类联系人
{
公共字符串id{get;set;}
公共字符串名称{get;set;}
公共字符串电子邮件{get;set;}
公共字符串地址{get;set;}
公共字符串{get;set;}
公用电话{get;set;}
}
公共类联系人列表
{
公共列表联系人{get;set;}
}
XAML:
<Grid>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Label Grid.Row="0" Margin="10" Text="Display Json Data" FontSize="25" />
<ListView x:Name="listviewConacts" Grid.Row="1" HorizontalOptions="FillAndExpand" HasUnevenRows="True" ItemSelected="listviewContacts_ItemSelected">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid HorizontalOptions="FillAndExpand" Padding="10">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Label Text="{Binding name}" HorizontalOptions="StartAndExpand" Grid.Row="0" TextColor="Blue" FontAttributes="Bold"/>
<Label Text="{Binding email}" HorizontalOptions="StartAndExpand" Grid.Row="1" TextColor="Orange" FontAttributes="Bold"/>
<Label Text="{Binding phone.mobile}" HorizontalOptions="StartAndExpand" Grid.Row="2" TextColor="Gray" FontAttributes="Bold"/>
<BoxView HeightRequest="2" Margin="0,10,10,0" BackgroundColor="Gray" Grid.Row="3" HorizontalOptions="FillAndExpand" />
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
<ActivityIndicator x:Name="ProgressLoader" IsRunning="True"/>
</Grid>
基于上面的模型和XAML,如何实现可扩展和可折叠的
ListView
,如上图所示?在ListView中显示数据,只需在ViewCell中使用一个GridLayout即可。在GridLayout中使用“高度自动”设置两行。在第一行中,显示标题和按钮,在第二行中,只需添加项目relatesd数据并将一个isvisible属性绑定到第二行。单击向上箭头,只需反转isvisible属性的值
也就是说,如果isvisible属性为true,那么它将显示2行,如果isvisible属性为false,那么它将只显示该标题
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="40"/>
</Grid.ColumnDefinitions>
<Label Text="{Binding HeaderText}" Grid.Row="0"
Grid.Column="0" />
<Button Text="Show" Grid.Row="0" Grid.Column="1"
Clicked="LableVisibleButton"/>
<Label
Grid.Row="1" Grid.Grid.ColumnSpan="2"
FormattedText="{Binding FormattedText}" IsVisible="
{Binding LabelVisible}"/>
</ViewCell>
我在记事本上做过,所以没有测试过。此外,我通常不做xaml。然而,这应该是可行的。我刚刚在网格顶部添加了两个按钮,绑定到同一个命令,该命令切换布尔值,以表示网格是否应可见 您的ViewModel:
namespace XamlSamples.Models
{
public class Phone
{
public string mobile { get; set; }
public string home { get; set; }
public string office { get; set; }
}
public class Contact
{
public string id { get; set; }
public string name { get; set; }
public string email { get; set; }
public string address { get; set; }
public string gender { get; set; }
public Phone phone { get; set; }
public bool IsCollapsed { get; private set; }
public ICommand ToggleCollapseCommand { get; }
public Contact() => ToggleCollapseCommand = new Command(_ => IsCollapsed = !IsCollapsed);
}
public class ContactList
{
public List<Contact> contacts { get; set; }
}
public class InvertBoolConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture) => !(bool)value;
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) => !(bool)value;
}
}
名称空间XamlSamples.Models
{
公用电话
{
公共字符串mobile{get;set;}
公共字符串home{get;set;}
公共字符串办公室{get;set;}
}
公共类联系人
{
公共字符串id{get;set;}
公共字符串名称{get;set;}
公共字符串电子邮件{get;set;}
公共字符串地址{get;set;}
公共字符串{get;set;}
公用电话{get;set;}
公共集合{get;私有集合;}
public ICommand ToggleCollapseCommand{get;}
public Contact()=>ToggleCollapseCommand=new命令(=>IsCollapsed=!IsCollapsed);
}
公共类联系人列表
{
公共列表联系人{get;set;}
}
公共类InvertBoolConverter:IValueConverter
{
公共对象转换(对象值、类型targetType、对象参数、CultureInfo区域性)=>!(bool)值;
公共对象ConvertBack(对象值、类型targetType、对象参数、CultureInfo区域性)=>!(bool)值;
}
}
你的看法:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:models="clr-namespace:XamlSamples.Models;assembly=XamlSamples"
x:Class="XamlSamples.CollapsableListView">
<ContentPage.Resources>
<ResourceDictionary>
<models:InvertBoolConverter x:Key="invertBoolConverter" />
</ResourceDictionary>
</ContentPage.Resources>
<Grid>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Label Grid.Row="0" Margin="10" Text="Display Json Data" FontSize="25" />
<ListView x:Name="listviewConacts" Grid.Row="1" HorizontalOptions="FillAndExpand" HasUnevenRows="True" ItemSelected="listviewContacts_ItemSelected">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Orientation="Vertical">
<Button Text="Tap to Uncollapse" Command="{Binding ToggleCollapseCommand}" IsVisible="{Binding IsCollapsed}"/>
<Button Text="Tap to Collapse" Command="{Binding ToggleCollapseCommand}" IsVisible="{Binding IsCollapsed, Converter={StaticResource invertBoolConverter}}"/>
<Grid HorizontalOptions="FillAndExpand" Padding="10" IsVisible="{Binding IsCollapsed, Converter={StaticResource invertBoolConverter}}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Label Text="{Binding name}" HorizontalOptions="StartAndExpand" Grid.Row="0" TextColor="Blue" FontAttributes="Bold"/>
<Label Text="{Binding email}" HorizontalOptions="StartAndExpand" Grid.Row="1" TextColor="Orange" FontAttributes="Bold"/>
<Label Text="{Binding phone.mobile}" HorizontalOptions="StartAndExpand" Grid.Row="2" TextColor="Gray" FontAttributes="Bold"/>
<BoxView HeightRequest="2" Margin="0,10,10,0" BackgroundColor="Gray" Grid.Row="3" HorizontalOptions="FillAndExpand" />
</Grid>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
<ActivityIndicator x:Name="ProgressLoader" IsRunning="True"/>
</Grid>
默认情况下没有,但从外观上看,您正在寻找手风琴控件或