Xamarin.forms - Gridview 行高錯誤

Question

我的 ContentPage 在 ListView 中有一個 Grid，其中包含一個帶有標簽和圖像的列 (x:Name="stlNomeMiniatura")，如下所示：

 <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="InventarioBensCelular.MainPage" BackgroundColor="White"> <ContentPage.Content> <StackLayout> <StackLayout Orientation="Vertical" VerticalOptions="Start" HeightRequest="130" Background="#003399"> <StackLayout Orientation="Horizontal" HorizontalOptions="Start" VerticalOptions="Start" HeightRequest="40" Margin="7,10"> <StackLayout Orientation="Horizontal"> <Image Source="Icone.png" Aspect="Fill" HeightRequest="40" WidthRequest="48" VerticalOptions="Center" HorizontalOptions="Start"/> </StackLayout> <StackLayout Orientation="Horizontal" WidthRequest="300" HeightRequest="40"> <StackLayout Orientation="Vertical"> <Label x:Name="lblTitulo" Text="Inventário de Bens" FontSize="17" FontAttributes="Bold" VerticalOptions="Start" TextColor="White" Padding="0,-2,0,0"/> <Label x:Name="lblSubtitulo" Text="Transmissão de Foto" FontSize="17" FontAttributes="Bold" VerticalOptions="Start" TextColor="White" Padding="0,-7,0,0"/> </StackLayout> </StackLayout> <StackLayout Orientation="Horizontal" HorizontalOptions="EndAndExpand" VerticalOptions="Center" HeightRequest="40"> <ImageButton Source="ParametrosVerde.png" HorizontalOptions="Center" VerticalOptions="Center" HeightRequest="32" WidthRequest="32" Clicked="Parametro_Clicou"/> </StackLayout> </StackLayout> <StackLayout Orientation="Horizontal" HorizontalOptions="CenterAndExpand" VerticalOptions="Start"> <StackLayout WidthRequest="160" Margin="7,0"> <Frame x:Name="TiraFoto" CornerRadius="10" BorderColor="DarkGreen" HorizontalOptions="StartAndExpand" Padding="0" HeightRequest="32" VerticalOptions="Start" BackgroundColor="#E0FFE0" WidthRequest="160"> <Frame.GestureRecognizers> <TapGestureRecognizer Tapped="TiraFoto_Clicou" /> </Frame.GestureRecognizers> <StackLayout Orientation="Horizontal" HorizontalOptions="StartAndExpand" Padding="10,0,0,0"> <Image Source="Camera.png" Aspect="Fill" HeightRequest="26" WidthRequest="24" VerticalOptions="Center" HorizontalOptions="Start"/> <Label Text="Tirar Uma Foto" FontSize="16" FontAttributes="Bold" VerticalTextAlignment="Center" HorizontalOptions="Start" TextColor="DarkGreen"/> </StackLayout> </Frame> </StackLayout> <StackLayout WidthRequest="160"> <Frame x:Name="Sair" CornerRadius="10" BorderColor="Red" Padding="0" HeightRequest="32" VerticalOptions="Start" BackgroundColor="#FFE8E8" WidthRequest="160"> <Frame.GestureRecognizers> <TapGestureRecognizer Tapped="Sair_Clicou" /> </Frame.GestureRecognizers> <StackLayout Orientation="Horizontal" HorizontalOptions="StartAndExpand" Padding="10,0,0,0"> <Image Source="Sair.png" Aspect="Fill" HeightRequest="24" WidthRequest="24" VerticalOptions="Center" HorizontalOptions="Start" IsAnimationPlaying="True"/> <Label Text="Sair Programa" FontSize="16" FontAttributes="Bold" VerticalTextAlignment="Center" HorizontalOptions="Start" TextColor="Red"/> </StackLayout> </Frame> </StackLayout> <StackLayout> </StackLayout> <StackLayout Margin="0,-2"> <Frame x:Name="WiFi" CornerRadius="10" BorderColor="#003399" Padding="0" HeightRequest="35" VerticalOptions="Center" BackgroundColor="White" WidthRequest="35"> <Frame.GestureRecognizers> <TapGestureRecognizer Tapped="WiFi_Clicou" /> </Frame.GestureRecognizers> <Image x:Name="imgWiFiStatus" Source="WifiVermelho.gif" Aspect="Fill" HeightRequest="24" WidthRequest="24" VerticalOptions="Center" HorizontalOptions="Center"/> </Frame> </StackLayout> </StackLayout> </StackLayout> <Frame BackgroundColor="Transparent" HeightRequest="25" Padding="0" VerticalOptions="Center" Margin="10,0"> <Label Text="Arquivos a Transmitir:" FontSize="15" FontAttributes="Bold" VerticalOptions="Start" TextColor="#003399"/> </Frame> <StackLayout Margin="10,0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"> <ListView x:Name="ltvArquivoLista" SeparatorVisibility="None" SelectionMode="None" HasUnevenRows="False" IsPullToRefreshEnabled = "True"> <ListView.ItemTemplate> <DataTemplate> <ViewCell> <Grid BackgroundColor="Transparent"> <Grid.RowDefinitions> <RowDefinition Height="169"></RowDefinition> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="347"></ColumnDefinition> <ColumnDefinition Width="40"></ColumnDefinition> </Grid.ColumnDefinitions> <StackLayout x:Name="stlNomeMiniatura" Grid.Row="0" Grid.Column="0" Orientation="Vertical" HorizontalOptions="StartAndExpand" VerticalOptions="StartAndExpand"> <Label Text="{Binding Nome, Mode=OneWay}" FontSize="15" VerticalOptions="Start" TextColor="#003399"/> <Image Source="{Binding Miniatura, Mode=OneWay}" Aspect="AspectFit" VerticalOptions="Start" HorizontalOptions="Start"/> </StackLayout> <StackLayout Grid.Row="0" Grid.Column="1" Orientation="Vertical" HorizontalOptions="StartAndExpand" VerticalOptions="StartAndExpand"> <Image x:Name="cmdExcluirFoto" Source="{Binding BotaoExcluirImagem, Mode=OneWay}" Aspect="AspectFill" HeightRequest="32" WidthRequest="32" VerticalOptions="Start" HorizontalOptions="Start"> <Image.GestureRecognizers> <TapGestureRecognizer NumberOfTapsRequired="1" Tapped="Foto_Excluir_Clicou"/> </Image.GestureRecognizers> </Image> </StackLayout> </Grid> </ViewCell> </DataTemplate> </ListView.ItemTemplate> </ListView> </StackLayout> </StackLayout> </ContentPage.Content> </ContentPage>

在 .CS 文件中，我有以下一段代碼，顯示了如何使用 ObservableCollection "Arquivo" 設置 ListView ItemsSource：

        public ObservableCollection<Arquivo> Arquivos = new ObservableCollection<Arquivo>();

    private List<string> ArquivosATransmitir = null;
    private DateTime TestaConexaoIntervaloDtInicio = Convert.ToDateTime("2000/01/01 00:00:00");
    private DateTime TestaConexaoIntervaloDtFim = Convert.ToDateTime("2000/01/01 00:00:00");

    public MainPage()
    {
        InitializeComponent();

        DeviceInfo = new DeviceInfo.CDeviceInfo();

        Rotinas.File_Found("Inventario.ini", DeviceInfo.Info.Application.DataFolder, false, @"/");
        if (Rotinas.INIFileName == null)
        {
            Rotinas.INIFileName = DeviceInfo.Info.Application.DataFolder + @"/Inventario.ini";
            Rotinas.INI_Write("[SISTEMA]", "Titulo", "Inventário de Bens");
            Rotinas.INI_Write("[SISTEMA]", "Subtitulo", "Transmissão de Fotos");
            Rotinas.INI_Write("[SERVIDOR]", "IP", "192.168.0.22");
            Rotinas.INI_Write("[SERVIDOR]", "Porta", "1234");
        }

        TituloSistema = Rotinas.INI_Read("[SISTEMA]", "Titulo");
        Subtitulo = Rotinas.INI_Read("[SISTEMA]", "Subtitulo");
        ServidorIP = Rotinas.INI_Read("[SERVIDOR]", "IP");
        if (ServidorIP != "")
        {
            string auxPorta = Rotinas.INI_Read("[SERVIDOR]", "Porta");
            if (auxPorta != null)
            {
                ServidorPorta = auxPorta;
            }
            else
            {
                ServidorPorta = "1234";
            }
        } else
        {
            ServidorIP = null;
            ServidorPorta = null;
        }

        this.lblTitulo.Text = TituloSistema;
        this.lblSubtitulo.Text = Subtitulo;

        ConexaoServidor = new Connection();

        ConexaoServidor.FileTypeName = "Fotos";

        DiretorioArquivosATransmitir = DeviceInfo.Info.Application.DataFolder + @"/ArquivosATransmitir";
        if (!Directory.Exists(DiretorioArquivosATransmitir))
        {
            Directory.CreateDirectory(DiretorioArquivosATransmitir);
        }
        ArquivosATransmitir = Directory.GetFiles(DiretorioArquivosATransmitir, "*.*", SearchOption.AllDirectories)
                              .Where(file => new string[] { ".jpg" }.Contains(Path.GetExtension(file))).ToList();
        if (ArquivosATransmitir.Count > 0)
        {
            for (int Ctr = 0; Ctr <= ArquivosATransmitir.Count - 1; Ctr++)
            {
                GridArquivo_Incluir(ArquivosATransmitir[Ctr]);
            }
        }

        ltvArquivoLista.ItemsSource = Arquivos;

        Testa_Conexao_Servidor();
    }

我希望它顯示如下：

但是，GridView 顯示的行高固定，圖像被截斷，如下所示：

我究竟做錯了什么？

提前致謝，抱歉我的英語不好。

馬塞洛·卡馬拉特

Answer 1

您可以嘗試如下修改您的代碼：

1.將HasUnevenRows （ ltvArquivoLista ）的屬性 HasUnevenRows 的值從False更改為True

 HasUnevenRows="True"

2.change Height的RowDefinition從169到*或Auto ;

                        <Grid.RowDefinitions>
                            <RowDefinition Height="*"></RowDefinition>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="347"></ColumnDefinition>
                            <ColumnDefinition Width="40"></ColumnDefinition>
                        </Grid.ColumnDefinitions>