ListView高度设置

只需加个属性 如下代码 HasUnevenRows="True"

<ContentPage.Content>
        <StackLayout>
            <Label Text="ss" />
            <Button Text="GetData" Clicked="Button_Clicked" />


            <ListView x:Name="listView" HasUnevenRows="True"
              Margin="20">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <StackLayout Padding="20,0,0,0"  HorizontalOptions="StartAndExpand" Orientation="Horizontal">
                                <Label Text="{Binding UserName}" VerticalTextAlignment="Center" />
                                <!--<Image Source="check.png"    IsVisible="{Binding Done}" />-->
                                <Label Text="{Binding PassWord}" VerticalTextAlignment="Center"/>
                            </StackLayout>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackLayout>

    </ContentPage.Content>