Xamarin.forms 如何添加“；查看更多信息”；并在3行后的标签末尾查看较少的内容

我的标签中有10行数据，但只需要显示3行，然后需要添加更多视图按钮和扩展更少视图，如何以xamarin形式添加它根据您的描述，您可以使用自定义控件来完成此操作

首先，您需要创建contentview，名称为LargeTextLabel.xaml

<ContentView.Content>
    <StackLayout Orientation="Vertical">
        <Label
            x:Name="SmallLabel"
            BackgroundColor="Beige"
            HeightRequest="50"
            IsVisible="true" />
        <Label
            x:Name="FullLabel"
            BackgroundColor="BurlyWood"
            HeightRequest="200"
            IsVisible="false" />
        <Button x:Name="ExpandContractButton" Text="See More" />
    </StackLayout>
</ContentView.Content>

现在，您可以在页面中使用此自定义控件

<ContentPage.Content>
    <StackLayout>
        <local:LargeTextLabel
            Command="{Binding ExpandContractCommand}"
            Expanded="{Binding TextExpanded}"
            Text="{Binding LabelText}" />
    </StackLayout>
</ContentPage.Content>

---

键入local:LargeTextLabel not found。我这样添加了xmlns:local=“clr namespace:ProjectName”@Mayuri，我已经在github上传了示例，请下载并尝试测试它。如果我的回复解决了您的问题，请记住将我的回复标记为答案，谢谢。嗨，这对我不起作用，我有一个列表视图，其中消息是它们的，如果消息标签超过5行，我想添加更多。否则我不想显示更多按钮当前，每个标签上都添加了更多按钮，并且无法单击到exampland@Cherry Bu-MSFT

<ContentPage.Content>
    <StackLayout>
        <local:LargeTextLabel
            Command="{Binding ExpandContractCommand}"
            Expanded="{Binding TextExpanded}"
            Text="{Binding LabelText}" />
    </StackLayout>
</ContentPage.Content>

public partial class Page3 : ContentPage, INotifyPropertyChanged
{
    private string _LabelText;
    public string LabelText
    {
        get { return _LabelText; }
        set
        {
            _LabelText = value;
            RaisePropertyChanged("LabelText");

        }
    }
    private ICommand _ExpandContractCommand;
    private bool _TextExpanded;

    public bool TextExpanded
    {
        get { return _TextExpanded; }
        set
        {
            _TextExpanded = value;
            RaisePropertyChanged("TextExpanded");
        }
    }
    public Page3 ()
    {
        InitializeComponent ();
        LabelText = "Can any one help me on this?\nI want set read more option for multiline text end of label when i click on that read more it will expand or navigate to the any other page. Please help me on this .\n\nThanks in advance.";

        this.BindingContext = this;
    }
    public ICommand ExpandContractCommand
    {
        get
        {
            if (_ExpandContractCommand == null)
            {
                _ExpandContractCommand = new Command(() => {
                    TextExpanded = !TextExpanded;
                });
            }

            return _ExpandContractCommand;
        }
    }


    public event PropertyChangedEventHandler PropertyChanged;


    public void RaisePropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }

}