Xamarin.forms Xamarin表单内容页使背景色透明_Xamarin.forms_Custom Renderer_Modalpopup

Xamarin.forms Xamarin表单内容页使背景色透明

xamarin.forms

Xamarin.forms Xamarin表单内容页使背景色透明,xamarin.forms,custom-renderer,modalpopup,Xamarin.forms,Custom Renderer,Modalpopup,我有一个要求，我需要在模式弹出页面中显示列表。我可以显示列表，但我不能使背景颜色透明或半透明，以便其下的页面部分可见我正在使用以下命令从视图模型中推送页面： NavigationParameters oNavParams = new NavigationParameters(); oNavParams.Add("Mode", "FeedBack"); oNavParams.Add("selectedItem", txtFeedback); _navigationService.Navigate

我有一个要求，我需要在模式弹出页面中显示列表。我可以显示列表，但我不能使背景颜色透明或半透明，以便其下的页面部分可见

我正在使用以下命令从视图模型中推送页面：

NavigationParameters oNavParams = new NavigationParameters();
oNavParams.Add("Mode", "FeedBack");
oNavParams.Add("selectedItem", txtFeedback);
_navigationService.NavigateAsync("PopupBox", oNavParams);

<?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:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
             xmlns:local="clr-namespace:MyApp"
             prism:ViewModelLocator.AutowireViewModel="True"
             x:Class="MyApp.Views.PopupBox">
    <ContentPage.Content>
        <AbsoluteLayout Padding="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <ContentView x:Name="popupListView" BackgroundColor="Transparent" Padding="10, 0" IsVisible="false" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
                <StackLayout VerticalOptions="Center" HorizontalOptions="Center">
                    <StackLayout Orientation="Vertical" HeightRequest="200" WidthRequest="300" BackgroundColor="White">
                        <ListView x:Name="sampleList">
                        </ListView>
                    </StackLayout>
                </StackLayout>
            </ContentView>
        </AbsoluteLayout>
    </ContentPage.Content>
</ContentPage>

  public PopupBox()
        {
            try
            {
                InitializeComponent();
                NavigationPage.SetHasNavigationBar(this, false);
                sampleList.ItemsSource = new List<string>
            {
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView"
            };

                 popupListView.IsVisible = true;


            }
            catch (Exception ex)
            {

            }
            }

这是我的xaml代码：

NavigationParameters oNavParams = new NavigationParameters();
oNavParams.Add("Mode", "FeedBack");
oNavParams.Add("selectedItem", txtFeedback);
_navigationService.NavigateAsync("PopupBox", oNavParams);

<?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:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
             xmlns:local="clr-namespace:MyApp"
             prism:ViewModelLocator.AutowireViewModel="True"
             x:Class="MyApp.Views.PopupBox">
    <ContentPage.Content>
        <AbsoluteLayout Padding="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <ContentView x:Name="popupListView" BackgroundColor="Transparent" Padding="10, 0" IsVisible="false" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
                <StackLayout VerticalOptions="Center" HorizontalOptions="Center">
                    <StackLayout Orientation="Vertical" HeightRequest="200" WidthRequest="300" BackgroundColor="White">
                        <ListView x:Name="sampleList">
                        </ListView>
                    </StackLayout>
                </StackLayout>
            </ContentView>
        </AbsoluteLayout>
    </ContentPage.Content>
</ContentPage>

  public PopupBox()
        {
            try
            {
                InitializeComponent();
                NavigationPage.SetHasNavigationBar(this, false);
                sampleList.ItemsSource = new List<string>
            {
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView"
            };

                 popupListView.IsVisible = true;


            }
            catch (Exception ex)
            {

            }
            }

但它不起作用。有什么方法可以实现这一点吗？使用自定义渲染器或任何其他解决方法来显示模态。

我不想使用Rg.Plugins.Popup，因为我有问题。因此我正在寻找替代方案。请帮助。

如果没有自定义渲染器，这将无法工作。

现在获得所需的常用方法是简单地使用Xamarin Forms（）的弹出页面插件nuget

Rg.Plugins.Popup

可用。

如果没有自定义渲染器，这将无法工作。

现在获得所需内容的一种常见方法是简单地使用Xamarin Forms（）的弹出页面插件nuget

Rg.Plugins.Popup

可用。

根据@nicks评论，请更改您的代码。我将添加一些可能对您有帮助的代码示例行。

Rg.Plugins.Popup

使用此插件并删除ContentPage添加此插件

<?xml version="1.0" encoding="utf-8" ?>
<pages:PopupPage 
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:pages="clr-namespace:Rg.Plugins.Popup.Pages;assembly=Rg.Plugins.Popup"
    xmlns:animations="clr-namespace:Rg.Plugins.Popup.Animations;assembly=Rg.Plugins.Popup">

           <ListView x:Name="lst" BackgroundColor="Gray"  HasUnevenRows="True" >
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <Grid HorizontalOptions="FillAndExpand" Padding="10" BackgroundColor="White">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="Auto"/>
                                    <ColumnDefinition Width="Auto"/>
                                </Grid.ColumnDefinitions>
                                <Label Text="{Binding DisplayName}" HorizontalOptions="StartAndExpand" Grid.Row="0"  Grid.Column="0" FontAttributes="Bold"/>
                                <Label Text="{Binding DisplayContact}" HorizontalOptions="EndAndExpand" Grid.Row="0" Grid.Column="1" FontSize="11"/>
                                <Label Text="{Binding DisplayAddress}" VerticalOptions="StartAndExpand" Grid.Row="1" Grid.Column="0" FontSize="11"/>
                            </Grid>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
</pages:PopupPage>

所以在最后一次调用上面的类作为按钮点击的弹出窗口后，下面是代码

using Rg.Plugins.Popup.Extensions;
{
ClassName _className = new ClassName();
void Button1Click(object sender, System.EventArgs e)
  {
    Navigation.PushPopupAsync(_className);
   }
}

希望这能帮助你

根据@nicks评论，请更改您的代码，我将添加一些可能对您有帮助的代码示例行。

Rg.Plugins.Popup

使用此插件并删除ContentPage添加此插件

<?xml version="1.0" encoding="utf-8" ?>
<pages:PopupPage 
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:pages="clr-namespace:Rg.Plugins.Popup.Pages;assembly=Rg.Plugins.Popup"
    xmlns:animations="clr-namespace:Rg.Plugins.Popup.Animations;assembly=Rg.Plugins.Popup">

           <ListView x:Name="lst" BackgroundColor="Gray"  HasUnevenRows="True" >
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <Grid HorizontalOptions="FillAndExpand" Padding="10" BackgroundColor="White">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                </Grid.RowDefinitions>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="Auto"/>
                                    <ColumnDefinition Width="Auto"/>
                                </Grid.ColumnDefinitions>
                                <Label Text="{Binding DisplayName}" HorizontalOptions="StartAndExpand" Grid.Row="0"  Grid.Column="0" FontAttributes="Bold"/>
                                <Label Text="{Binding DisplayContact}" HorizontalOptions="EndAndExpand" Grid.Row="0" Grid.Column="1" FontSize="11"/>
                                <Label Text="{Binding DisplayAddress}" VerticalOptions="StartAndExpand" Grid.Row="1" Grid.Column="0" FontSize="11"/>
                            </Grid>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
</pages:PopupPage>

所以在最后一次调用上面的类作为按钮点击的弹出窗口后，下面是代码

using Rg.Plugins.Popup.Extensions;
{
ClassName _className = new ClassName();
void Button1Click(object sender, System.EventArgs e)
  {
    Navigation.PushPopupAsync(_className);
   }
}

希望这能帮助你

如前所述，您可以使用Rg.Plugins.Popup，然后只需将背景设置为图像中的透明（这样它就不仅仅是不透明的）

我的弹出页面示例：

NavigationParameters oNavParams = new NavigationParameters();
oNavParams.Add("Mode", "FeedBack");
oNavParams.Add("selectedItem", txtFeedback);
_navigationService.NavigateAsync("PopupBox", oNavParams);

<?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:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
             xmlns:local="clr-namespace:MyApp"
             prism:ViewModelLocator.AutowireViewModel="True"
             x:Class="MyApp.Views.PopupBox">
    <ContentPage.Content>
        <AbsoluteLayout Padding="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <ContentView x:Name="popupListView" BackgroundColor="Transparent" Padding="10, 0" IsVisible="false" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
                <StackLayout VerticalOptions="Center" HorizontalOptions="Center">
                    <StackLayout Orientation="Vertical" HeightRequest="200" WidthRequest="300" BackgroundColor="White">
                        <ListView x:Name="sampleList">
                        </ListView>
                    </StackLayout>
                </StackLayout>
            </ContentView>
        </AbsoluteLayout>
    </ContentPage.Content>
</ContentPage>

  public PopupBox()
        {
            try
            {
                InitializeComponent();
                NavigationPage.SetHasNavigationBar(this, false);
                sampleList.ItemsSource = new List<string>
            {
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView"
            };

                 popupListView.IsVisible = true;


            }
            catch (Exception ex)
            {

            }
            }

点击：

Device.BeginInvokeOnMainThread(async () =>
        {
          Task<yourPopUpPage> task = Task.Run(() =>
          {
            return new yourPopUpPage();
          });

          task.Wait();

          if (task.Status == TaskStatus.RanToCompletion)
          {
            Device.BeginInvokeOnMainThread(async () =>
            {
              await App.GetCurrentPage().Navigation.PushPopupAsync(task.Result);
            });
          };
        });

Device.beginInvokeMainThread（异步（）=>
{
任务=任务。运行（（）=>
{
返回新的yourPopUpPage（）；
});
task.Wait（）；
if（task.Status==TaskStatus.RanToCompletion）
{
Device.beginInvokeMainThread（异步（）=>
{
等待App.GetCurrentPage（）.Navigation.PushPopupAsync（task.Result）；
});
};
});

如前所述，您可以使用Rg.Plugins.Popup，然后只需将背景设置为图像中的透明（这样它就不仅仅是不透明的）

我的弹出页面示例：

NavigationParameters oNavParams = new NavigationParameters();
oNavParams.Add("Mode", "FeedBack");
oNavParams.Add("selectedItem", txtFeedback);
_navigationService.NavigateAsync("PopupBox", oNavParams);

<?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:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
             xmlns:local="clr-namespace:MyApp"
             prism:ViewModelLocator.AutowireViewModel="True"
             x:Class="MyApp.Views.PopupBox">
    <ContentPage.Content>
        <AbsoluteLayout Padding="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <ContentView x:Name="popupListView" BackgroundColor="Transparent" Padding="10, 0" IsVisible="false" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
                <StackLayout VerticalOptions="Center" HorizontalOptions="Center">
                    <StackLayout Orientation="Vertical" HeightRequest="200" WidthRequest="300" BackgroundColor="White">
                        <ListView x:Name="sampleList">
                        </ListView>
                    </StackLayout>
                </StackLayout>
            </ContentView>
        </AbsoluteLayout>
    </ContentPage.Content>
</ContentPage>

  public PopupBox()
        {
            try
            {
                InitializeComponent();
                NavigationPage.SetHasNavigationBar(this, false);
                sampleList.ItemsSource = new List<string>
            {
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView",
                "Test ListView"
            };

                 popupListView.IsVisible = true;


            }
            catch (Exception ex)
            {

            }
            }

点击：

Device.BeginInvokeOnMainThread(async () =>
        {
          Task<yourPopUpPage> task = Task.Run(() =>
          {
            return new yourPopUpPage();
          });

          task.Wait();

          if (task.Status == TaskStatus.RanToCompletion)
          {
            Device.BeginInvokeOnMainThread(async () =>
            {
              await App.GetCurrentPage().Navigation.PushPopupAsync(task.Result);
            });
          };
        });

Device.beginInvokeMainThread（异步（）=>
{
任务=任务。运行（（）=>
{
返回新的yourPopUpPage（）；
});
task.Wait（）；
if（task.Status==TaskStatus.RanToCompletion）
{
Device.beginInvokeMainThread（异步（）=>
{
等待App.GetCurrentPage（）.Navigation.PushPopupAsync（task.Result）；
});
};
});

如果您更新到Xamarin Forms 4.6，您可以设置：

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
...
BackgroundColor="Transparent"
xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
ios:Page.ModalPresentationStyle="OverFullScreen">

<StackLayout HorizontalOptions="FillAndExpand"

</StackLayout>

</ContentPage>


如果您更新到Xamarin Forms 4.6，您可以设置：
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
...
BackgroundColor="Transparent"
xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
ios:Page.ModalPresentationStyle="OverFullScreen">

<StackLayout HorizontalOptions="FillAndExpand"

</StackLayout>

</ContentPage>


我对Rg.Plugins.Popup有问题。我已经请求了帮助（）。你能建议我如何使用自定义渲染器吗？谢谢你的回复。我会尝试一下。我在这里描述了一种如何创建自定义弹出窗口（包括透明背景）的方法：建议从现有库复制渲染器，最可能不是最好的建议。我让Rg.Popup.Plugin工作了。检查这里的链接（）我对Rg.Plugins.Popup有问题。我已经请求了帮助（）。你能建议我如何使用自定义渲染器吗？谢谢你的回复。我会尝试一下。我已经描述了如何创建自定义弹出窗口的方法（包括透明背景）这里：建议从现有库中复制渲染器，很可能不是最好的建议。我得到了Rg.Popup.Plugin。请检查此处的链接（）你能澄清你的答案吗？我想他是想让内容页的背景变得透明，这样列表视图看起来就像是弹出窗口一样！@NirmalSubedi由于睡眠不足，我发布了错误的帖子。很抱歉给你带来不便。现在发布了正确的答案。你能澄清你的答案吗？我想他是想让内容页的背景变得透明nd是透明的，因此ListView看起来像它的弹出窗口！@NirmalSubedi由于睡眠不足，我发布了错误的帖子。很抱歉给您带来不便。现在发布了正确的答案。