我正在使用 Xamarin Forms 开发移动应用程序，我遇到了一个在 Android 上按预期工作但在 IOS 上没有的问题，我有一个共享按钮，它将调用工作平台的内置共享，传递标题和 uri，但是在 IOS 上，此功能似乎没有按预期工作，我不知道它是否很慢或有其他问题，因此您必须多次点击共享图标才能显示共享弹出窗口（再次，这非常有效在安卓上很好）。
请指教，以下是代码：
<StackLayout Grid.Column="2" Grid.ColumnSpan="2" Spacing="0" Margin="0,5,13,0">
<StackLayout.GestureRecognizers>
<TapGestureRecognizer Tapped="ImageButton_Clicked"/>
</StackLayout.GestureRecognizers>
<Image Source="export" HeightRequest="27" WidthRequest="20" VerticalOptions="Center" HorizontalOptions="End" Margin="0,0,0,0"/>
</StackLayout>
private async void ImageButton_Clicked(object sender, System.EventArgs e)
{
await Share.RequestAsync(new ShareTextRequest
{
Uri = "http://myurl",
Title = "My Title"
});
}
除了我之前的问题，我将分享整个 xaml 代码跃点，这可能会给出一个清晰的视图：
Xaml 代码：
<?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:Helpers="clr-namespace:StandardsView.Helper"
xmlns:telerikDataControls="clr-namespace:Telerik.XamarinForms.DataControls;assembly=Telerik.XamarinForms.DataControls"
xmlns:telerikListView="clr-namespace:Telerik.XamarinForms.DataControls.ListView;assembly=Telerik.XamarinForms.DataControls"
xmlns:local="clr-namespace:StandardsView.Views"
xmlns:telerikPrimitives="clr-namespace:Telerik.XamarinForms.Primitives;assembly=Telerik.XamarinForms.Primitives"
prism:ViewModelLocator.AutowireViewModel="True"
x:Class="StandardsView.Views.PreviewStandard"
x:Name="parent"
xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
ios:Page.UseSafeArea="False"
NavigationPage.HasNavigationBar="False"
BackgroundImageSource="{Binding AppModel.BackgroundImage}"
IsEnabled="{Binding AppModel.IsBusy, Converter={Helpers:InverseBoolConverter}}">
<Grid RowSpacing="0" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<telerikDataControls:RadListView x:Name="listView" Margin="10,0,0,0" SelectionMode="None" ItemsSource="{Binding AppModel.Benchmarks}" HeaderTemplate="{StaticResource ListHeaderTemplate}" FooterTemplate="{StaticResource ListFooterTemplate}">
<telerikDataControls:RadListView.ItemStyle>
<telerikListView:ListViewItemStyle BackgroundColor="Transparent" BorderLocation="None" BorderWidth="0" BorderColor="Transparent" />
</telerikDataControls:RadListView.ItemStyle>
<telerikDataControls:RadListView.SelectedItemStyle>
<telerikListView:ListViewItemStyle BackgroundColor="Transparent" />
</telerikDataControls:RadListView.SelectedItemStyle>
<telerikDataControls:RadListView.ItemTemplate>
<DataTemplate>
<telerikListView:ListViewTemplateCell>
<telerikListView:ListViewTemplateCell.View>
<StackLayout Padding="0" Spacing="0" BackgroundColor="Transparent" Margin="0,0,0,10">
<telerikPrimitives:RadBorder CornerRadius="15, 15, 0, 0" Padding="0" Margin="0,0,12,0">
<telerikPrimitives:RadBorder.Triggers>
<DataTrigger TargetType="telerikPrimitives:RadBorder" Binding="{Binding ResourceCount}" Value="0">
<Setter Property="CornerRadius" Value="15"/>
</DataTrigger>
</telerikPrimitives:RadBorder.Triggers>
<Grid BackgroundColor="White">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="19"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="60"/>
<ColumnDefinition Width="10"/>
</Grid.ColumnDefinitions>
<StackLayout Grid.Column="2" Grid.ColumnSpan="2" Spacing="0" Margin="0,5,13,0">
<StackLayout.GestureRecognizers>
<TapGestureRecognizer Command="{Binding ShareCommand}" />
</StackLayout.GestureRecognizers>
<Image Source="export" HeightRequest="27" WidthRequest="20" VerticalOptions="Center" HorizontalOptions="End" />
</StackLayout>
<StackLayout Grid.Column="1" Grid.ColumnSpan="2" Padding="0,0,0,10">
<Grid Margin="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<BoxView BackgroundColor="{StaticResource CPALMS_BlueGreen}" CornerRadius="0,0,5,5" HeightRequest="22" WidthRequest="130"/>
<Label Text="{Binding Code}" Style="{StaticResource BrowseItemTitle}" />
</Grid>
<Label MinimumHeightRequest="50" Style="{StaticResource BrowseItemDescription16}" Text="{Binding Description}" Margin="0,7,0,7" />
<StackLayout>
<StackLayout.Triggers>
<DataTrigger TargetType="StackLayout" Binding="{Binding Remarks}" Value="">
<Setter Property="IsVisible" Value="False"/>
</DataTrigger>
</StackLayout.Triggers>
<BoxView HeightRequest="1" BackgroundColor="{StaticResource CPALMS_BlueGreen}" ></BoxView>
<Label Style="{StaticResource StdClarificationsTitleLabel}" Text="Clarifications" />
<Label Style="{StaticResource StdClarificationsLabel}" Text="{Binding Remarks}" />
</StackLayout>
<BoxView HeightRequest="1" BackgroundColor="{StaticResource CPALMS_BlueGreen}" ></BoxView>
<Label Style="{StaticResource StdInfoLabel}">
<Label.Triggers>
<DataTrigger TargetType="Label" Binding="{Binding ContentComplexityDescription}" Value="">
<Setter Property="IsVisible" Value="False"/>
</DataTrigger>
</Label.Triggers>
<Label.FormattedText>
<FormattedString>
<Span Text="Content Complexity: " />
<Span Text="{Binding ContentComplexityDescription}"/>
</FormattedString>
</Label.FormattedText>
</Label>
<Label Style="{StaticResource StdInfoLabel}">
<Label.Triggers>
<DataTrigger TargetType="Label" Binding="{Binding DateStandard}" Value="">
<Setter Property="IsVisible" Value="False"/>
</DataTrigger>
</Label.Triggers>
<Label.FormattedText>
<FormattedString>
<Span Text="Date Adopted/Revised: " />
<Span Text="{Binding DateStandard}"/>
</FormattedString>
</Label.FormattedText>
</Label>
</StackLayout>
</Grid>
</telerikPrimitives:RadBorder>
<telerikPrimitives:RadBorder CornerRadius="0, 0, 15, 15" Padding="0" Margin="0,-2,12,0">
<telerikPrimitives:RadBorder.Triggers>
<DataTrigger TargetType="telerikPrimitives:RadBorder" Binding="{Binding ResourceCount}" Value="0">
<Setter Property="IsVisible" Value="false"/>
</DataTrigger>
</telerikPrimitives:RadBorder.Triggers>
<Grid BackgroundColor="#F29A33" Padding="0,5,0,5">
<Grid.GestureRecognizers>
<TapGestureRecognizer Tapped="PreviewStd" />
</Grid.GestureRecognizers>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="19"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="40"/>
<ColumnDefinition Width="7"/>
</Grid.ColumnDefinitions>
<StackLayout Grid.Column="1" Padding="0,0,5,10">
<StackLayout.GestureRecognizers>
<TapGestureRecognizer Tapped="PreviewStd"/>
</StackLayout.GestureRecognizers>
<Label Style="{StaticResource previewRelatedResourceLabel}">
<Label.GestureRecognizers>
<TapGestureRecognizer Tapped="PreviewStd"/>
</Label.GestureRecognizers>
<Label.FormattedText>
<FormattedString>
<Span Text="{Binding ResourceCount}" FontSize="{StaticResource LargeHeaderSize}" />
<Span Text="{Binding RelatedResourcesLabel}" />
</FormattedString>
</Label.FormattedText>
</Label>
</StackLayout>
<StackLayout Grid.Column="2" Spacing="0" Padding="0,5,0,0">
<StackLayout.GestureRecognizers>
<TapGestureRecognizer Tapped="PreviewStd"/>
</StackLayout.GestureRecognizers>
<Image Source="rightarrow" HeightRequest="31" WidthRequest="31" VerticalOptions="Center" HorizontalOptions="End" Margin="0,0,0,0"/>
</StackLayout>
</Grid>
</telerikPrimitives:RadBorder>
</StackLayout>
</telerikListView:ListViewTemplateCell.View>
</telerikListView:ListViewTemplateCell>
</DataTemplate>
</telerikDataControls:RadListView.ItemTemplate>
<telerikDataControls:RadListView.LayoutDefinition>
<telerikListView:ListViewLinearLayout VerticalItemSpacing="4"/>
</telerikDataControls:RadListView.LayoutDefinition>
</telerikDataControls:RadListView>
<local:NavigationBar Grid.Row="1" prism:ViewModelLocator.AutowirePartialView="{x:Reference parent}" VerticalOptions="End"/>
<local:LoadingPanel Grid.RowSpan="2" prism:ViewModelLocator.AutowirePartialView="{x:Reference parent}" IsVisible="{Binding AppModel.IsBusy}"/>
</Grid>
</ContentPage>
型号类：
using Prism.Commands;
namespace StandardsView.Models.Entities
{
public class StandardViewModel
{
public virtual int ID { get; set; }
public virtual string Description { get; set; }
public virtual string Code { get; set; }
public virtual string DateStandard { get; set; }
public virtual string Status { get; set; }
public virtual string SubjectAreaName { get; set; }
public virtual string GradeLevelCode { get; set; }
public virtual string DomainAlias { get; set; }
public virtual string DomainDescription { get; set; }
public virtual string IdeaAlias { get; set; }
public virtual string IdeaTitle { get; set; }
public virtual int ResourceCount { get; set; }
public virtual string Remarks { get; set; }
public virtual string RelatedResourcesLabel { get; set; }
public virtual string ContentComplexityDescription { get; set; }
public DelegateCommand ShareCommand { get; set; }
}
}
视图模型：
using Prism.Commands;
using Prism.Navigation;
using System;
using Xamarin.Forms;
using Xamarin.Essentials;
namespace StandardsView.ViewModels
{
public class PreviewStandardViewModel : ViewModelBase
{
public DelegateCommand PreviewCommand { get; }
public PreviewStandardViewModel(INavigationService navigationService)
: base(navigationService)
{
App.GlobalAppModel.Benchmarks[0].ShareCommand = new DelegateCommand(() => ShareBenchmark());
AppModel = App.GlobalAppModel;
ShowBackButton = true;
Instructions = "Benchmark details";
PreviewCommand = new DelegateCommand(() => PreviewBenchmark());
}
private void PreviewBenchmark()
{
Launcher.OpenAsync(new Uri(string.Format(Constants.previewStandardUrl, App.GlobalAppModel.Benchmarks[0].ID)));
}
private void ShareBenchmark()
{
Device.BeginInvokeOnMainThread(async () =>
{
string strUri = string.Format(Constants.previewStandardUrl, App.GlobalAppModel.Benchmarks[0].ID);
string strTitle = App.GlobalAppModel.Benchmarks[0].Code;
string strText = App.GlobalAppModel.Benchmarks[0].Code + " - " + App.GlobalAppModel.Benchmarks[0].Description;
await Share.RequestAsync(new ShareTextRequest
{
Uri = strUri,
Title = strTitle,
Text = strText
});
});
}
}
}
还有一个重要的信息我必须提到，在上面的代码中，您将在 Model 类中看到在其中声明的 DelegateCommand，在 ViewModel 类中您将看到该委托被分配给该方法，这是最后一个我的尝试和在那次尝试之前我正在使用：
<StackLayout Grid.Column="2" Grid.ColumnSpan="2" Spacing="0" Margin="0,5,13,0">
<StackLayout.GestureRecognizers>
<TapGestureRecognizer Tapped="ImageButton_Clicked"/>
</StackLayout.GestureRecognizers>
<Image Source="export" HeightRequest="27" WidthRequest="20" VerticalOptions="Center" HorizontalOptions="End" Margin="0,0,0,0"/>
</StackLayout>
private void ImageButton_Clicked(object sender, System.EventArgs e)
{
Device.BeginInvokeOnMainThread(async () =>
{
string strUri = string.Format(Constants.previewStandardUrl, App.GlobalAppModel.Benchmarks[0].ID);
string strTitle = App.GlobalAppModel.Benchmarks[0].Code;
string strText = App.GlobalAppModel.Benchmarks[0].Code + " - " + App.GlobalAppModel.Benchmarks[0].Description;
await Share.RequestAsync(new ShareTextRequest
{
Uri = strUri,
Title = strTitle,
Text = strText
});
});
}
所以所有这些情况都会导致相同的行为，我现在分享了我所有的代码，希望这将有助于更好地理解我的问题。