带参数和 TabBar 的 Shell Routing [英] Shell Routing With Parameters And TabBar
问题描述
我正在尝试将参数路由到一个可以被多个选项卡重用的页面(其中包含一个 WebView
).我想传递一个 Url
和 Title
但到目前为止在 BrowserPage
我得到空字符串
I'm trying to route parameters to a page (which contains a WebView
) that can be reused by multiple tabs. I'd like to pass a Url
and Title
but so far in the BrowserPage
I'm getting empty strings
AppShell.xaml
AppShell.xaml
<TabBar>
<ShellContent Title="Page 1" Icon="icon_about.png" Route="Page1Route" ContentTemplate="{DataTemplate local:BrowserPage}"/>
<ShellContent Title="Page 2" Icon="icon_about.png" Route="Page2Route" ContentTemplate="{DataTemplate local:BrowserPage}"/>
</TabBar>
AppShell.xaml.cs
AppShell.xaml.cs
public partial class AppShell : Xamarin.Forms.Shell {
public AppShell() {
InitializeComponent();
Routing.RegisterRoute("Page1Route?Url=page1url&Title=Page1", typeof(BrowserPage));
Routing.RegisterRoute("Page2Route?Url=page2url&Title=Page2", typeof(BrowserPage));
}
}
BrowserPage.xaml.cs
BrowserPage.xaml.cs
[XamlCompilation(XamlCompilationOptions.Compile)]
[QueryProperty(nameof(Url), nameof(Url))]
[QueryProperty(nameof(Title), nameof(Title))]
public partial class BrowserPage : ContentPage {
public BrowserPage() {
InitializeComponent();
((BrowserViewModel)BindingContext).Title = Title;
((BrowserViewModel)BindingContext).Url = Url;
}
private string url = "";
public string Url {
get {
return url;
}
set {
url = value;
OnPropertyChanged();
}
}
}
在 BrowserPage
代码隐藏中,Title
和 Url
为空.如何以这种方式正确传递和接收数据?
In the BrowserPage
code-behind, Title
and Url
are empty.
How do I properly pass and receive data this way?
推荐答案
我能够通过完全删除路由并将 Url 属性和 Title 属性添加到 BrowserPage 的代码隐藏中来解决此问题:
I was able to solve this by completely removing routing and adding a Url property and a Title property to the BrowserPage's codebehind:
private string url;
public string Url {
get => url;
set {
url = value;
((BrowserViewModel)BindingContext).SetSource(url);
}
}
private string pageTitle;
public string PageTitle {
get => pageTitle;
set {
pageTitle = value;
((BrowserViewModel)BindingContext).SetPageTitle(pageTitle);
}
}
在 AppShell.xaml 文件中,我删除了 Route
和 ContentTemplate
,并将 ShellContent.Content
设置为 此处描述.这允许我设置网址和标题:
In the AppShell.xaml file I removed the Route
and ContentTemplate
, and set the ShellContent.Content
as described here. That allows me to set the url and title:
<ShellContent Title="Page 1" Icon="icon_about.png" >
<local:BrowserPage Url="http://www.yahoo.com" PageTitle="Page 1"/>
</ShellContent>
<ShellContent Title="Page 2" Icon="icon_about.png">
<local:BrowserPage Url="http://www.google.com" PageTitle="Page 2"/>
</ShellContent>
当应用启动并设置 Url 和 PageTitle 时,它会将其传递给 ViewModel 并加载页面.
When the app starts and Url and PageTitle are set it passes it on to the ViewModel and it loads the page.
浏览器页面.xaml
<?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:vm="clr-namespace:MyApp.ViewModels"
x:Class="MyApp.Views.BrowserPage"
Title="{Binding Title}">
<ContentPage.BindingContext>
<vm:BrowserViewModel/>
</ContentPage.BindingContext>
<ContentPage.Resources>
<ResourceDictionary>
<Color x:Key="Accent">#96d1ff</Color>
</ResourceDictionary>
</ContentPage.Resources>
<Grid>
<WebView
x:Name="mywebview"
Source="{Binding Source}"
Cookies="{Binding Cookies}"
Navigating="mywebview_Navigating"
Navigated="mywebview_Navigated"
WidthRequest="1000"
HeightRequest="1000"/>
<ActivityIndicator
x:Name="spinner"
Color="Black"
IsRunning="True"
HorizontalOptions="Center"
VerticalOptions="Center"/>
</Grid>
</ContentPage>
BrowserPage.xaml.cs
BrowserPage.xaml.cs
using MyApp.ViewModels;
using System.Diagnostics;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace MyApp.Views {
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class BrowserPage : ContentPage {
private string url;
public string Url {
get => url;
set {
url = value;
((BrowserViewModel)BindingContext).SetSource(url);
}
}
private string pageTitle;
public string PageTitle {
get => pageTitle;
set {
pageTitle = value;
((BrowserViewModel)BindingContext).SetPageTitle(pageTitle);
}
}
public BrowserPage() {
InitializeComponent();
}
private void mywebview_Navigated(object sender, WebNavigatedEventArgs e) {
mywebview.IsVisible = true;
spinner.IsVisible = false;
}
private void mywebview_Navigating(object sender, WebNavigatingEventArgs e) {
mywebview.IsVisible = false;
spinner.IsVisible = true;
}
}
}
BrowserViewModel.cs
BrowserViewModel.cs
using System;
using System.Net;
using Xamarin.Forms;
namespace MyApp.ViewModels {
public class BrowserViewModel : BaseViewModel {
private string text;
public string Text {
get => text;
set {
SetProperty(ref text, value);
}
}
private UrlWebViewSource source;
public UrlWebViewSource Source {
get {
return source;
}
set {
SetProperty(ref source, value);
}
}
private CookieContainer cookies;
public CookieContainer Cookies {
get {
return cookies;
}
set {
SetProperty(ref cookies, value);
}
}
public BrowserViewModel() { }
public BrowserViewModel(string title) {
Title = title;
}
public void SetPageTitle(string title) {
Title = title;
}
public void SetSource(string Url) {
CookieContainer cookieJar = new CookieContainer();
Uri uri = new Uri(Url, UriKind.RelativeOrAbsolute);
Cookie cookie = new Cookie {
...
};
cookieJar.Add(uri, cookie);
Cookies = cookieJar;
Source = new UrlWebViewSource { Url = uri.ToString() };
}
}
}
AppShell.xaml
AppShell.xaml
<?xml version="1.0" encoding="UTF-8"?>
<Shell xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:MyApp.Views"
Title="MyApp"
x:Class="MyApp.AppShell">
<Shell.Resources>
<ResourceDictionary>
<Style x:Key="BaseStyle" TargetType="Element">
<Setter Property="Shell.BackgroundColor" Value="{StaticResource Primary}" />
<Setter Property="Shell.ForegroundColor" Value="White" />
<Setter Property="Shell.TitleColor" Value="White" />
<Setter Property="Shell.DisabledColor" Value="#B4FFFFFF" />
<Setter Property="Shell.UnselectedColor" Value="#95FFFFFF" />
<Setter Property="Shell.TabBarBackgroundColor" Value="{StaticResource Primary}" />
<Setter Property="Shell.TabBarForegroundColor" Value="White"/>
<Setter Property="Shell.TabBarUnselectedColor" Value="#95FFFFFF"/>
<Setter Property="Shell.TabBarTitleColor" Value="White"/>
</Style>
<Style TargetType="TabBar" BasedOn="{StaticResource BaseStyle}" />
<Style TargetType="FlyoutItem" BasedOn="{StaticResource BaseStyle}" />
</ResourceDictionary>
</Shell.Resources>
<TabBar>
<ShellContent Title="Page 1" Icon="icon_about.png" >
<local:BrowserPage Url="http://www.yahoo.com" PageTitle="Page 1"/>
</ShellContent>
<ShellContent Title="Page 2" Icon="icon_about.png">
<local:BrowserPage Url="http://www.google.com" PageTitle="Page 2"/>
</ShellContent>
</TabBar>
</Shell>
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