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.NET Core 3 WPF MVVM框架 Prism系列之導(dǎo)航系統(tǒng)

本文將介紹如何在.NET Core3環(huán)境下使用MVVM框架Prism基于區(qū)域Region的導(dǎo)航系統(tǒng)

在講解Prism導(dǎo)航系統(tǒng)之前，我們先來(lái)看看一個(gè)例子,我在之前的demo項(xiàng)目創(chuàng)建一個(gè)登錄界面：

我們看到這里是不是一開始想象到使用WPF帶有的導(dǎo)航系統(tǒng)，通過(guò)Frame和Page進(jìn)行頁(yè)面跳轉(zhuǎn)，然后通過(guò)導(dǎo)航日志的GoBack和GoForward實(shí)現(xiàn)后退和前進(jìn)，其實(shí)這是通過(guò)使用Prism的導(dǎo)航框架實(shí)現(xiàn)的,下面我們來(lái)看看如何在Prism的MVVM模式下實(shí)現(xiàn)該功能

1.注冊(cè)區(qū)域

LoginWindow.xaml：

<Window x:Class="PrismMetroSample.Shell.Views.Login.LoginWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:PrismMetroSample.Shell.Views.Login"
        xmlns:region="clr-namespace:PrismMetroSample.Infrastructure.Constants;assembly=PrismMetroSample.Infrastructure"
        mc:Ignorable="d"
        xmlns:prism="http://prismlibrary.com/"
        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
         Height="600" Width="400" prism:ViewModelLocator.AutoWireViewModel="True" ResizeMode="NoResize" WindowStartupLocation="CenterScreen"
        Icon="pack://application:,,,/PrismMetroSample.Infrastructure;Component/Assets/Photos/Home, homepage, menu.png" >
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="Loaded">
            <i:InvokeCommandAction Command="{Binding LoginLoadingCommand}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
    <Grid>
        <ContentControl prism:RegionManager.RegionName="{x:Static region:RegionNames.LoginContentRegion}" Margin="5"/>
    </Grid>
</Window>

2.注冊(cè)導(dǎo)航

App.cs：

  protected override void RegisterTypes(IContainerRegistry containerRegistry)
  {
        containerRegistry.Register<IMedicineSerivce, MedicineSerivce>();
        containerRegistry.Register<IPatientService, PatientService>();
        containerRegistry.Register<IUserService, UserService>();

        //注冊(cè)全局命令
        containerRegistry.RegisterSingleton<IApplicationCommands, ApplicationCommands>();
        containerRegistry.RegisterInstance<IFlyoutService>(Container.Resolve<FlyoutService>());

        //注冊(cè)導(dǎo)航
        containerRegistry.RegisterForNavigation<LoginMainContent>();
        containerRegistry.RegisterForNavigation<CreateAccount>();
  }

public class LoginWindowViewModel:BindableBase { private readonly IRegionManager _regionManager; private readonly IUserService _userService; private DelegateCommand _loginLoadingCommand; public DelegateCommand LoginLoadingCommand => _loginLoadingCommand ?? (_loginLoadingCommand = new DelegateCommand(ExecuteLoginLoadingCommand)); void ExecuteLoginLoadingCommand() { //在LoginContentRegion區(qū)域?qū)Ш降絃oginMainContent _regionManager.RequestNavigate(RegionNames.LoginContentRegion, "LoginMainContent"); Global.AllUsers = _userService.GetAllUsers(); } public LoginWindowViewModel(IRegionManager regionManager, IUserService userService) { _regionManager = regionManager; _userService = userService; } }

LoginMainContentViewModel.cs：

public class LoginMainContentViewModel : BindableBase
{
    private readonly IRegionManager _regionManager;

    private DelegateCommand _createAccountCommand;
    public DelegateCommand CreateAccountCommand =>
            _createAccountCommand ?? (_createAccountCommand = new DelegateCommand(ExecuteCreateAccountCommand));

    //導(dǎo)航到CreateAccount
    void ExecuteCreateAccountCommand()
    {
         Navigate("CreateAccount");
    }

    private void Navigate(string navigatePath)
    {
         if (navigatePath != null)
              _regionManager.RequestNavigate(RegionNames.LoginContentRegion, navigatePath);
        
    }


    public LoginMainContentViewModel(IRegionManager regionManager)
    {
         _regionManager = regionManager;
    }

 }

效果如下：

這里我們可以看到我們調(diào)用RegionMannager的RequestNavigate方法，其實(shí)這樣看不能很好的說(shuō)明是基于區(qū)域的做法，如果將換成下面的寫法可能更好理解一點(diǎn)：

   //在LoginContentRegion區(qū)域?qū)Ш降絃oginMainContent
  _regionManager.RequestNavigate(RegionNames.LoginContentRegion, "LoginMainContent");

換成

 //在LoginContentRegion區(qū)域?qū)Ш降絃oginMainContent
 IRegion region = _regionManager.Regions[RegionNames.LoginContentRegion];
 region.RequestNavigate("LoginMainContent");

其實(shí)RegionMannager的RequestNavigate源碼也是大概實(shí)現(xiàn)也是大概如此，就是去調(diào)Region的RequestNavigate的方法，而Region的導(dǎo)航是實(shí)現(xiàn)了一個(gè)INavigateAsync接口：

public interface INavigateAsync
{
   void RequestNavigate(Uri target, Action<NavigationResult> navigationCallback);
   void RequestNavigate(Uri target, Action<NavigationResult> navigationCallback, NavigationParameters navigationParameters);
    
}

我們可以看到有RequestNavigate方法三個(gè)形參：

  • target：表示將要導(dǎo)航的頁(yè)面Uri
  • navigationCallback:導(dǎo)航后的回調(diào)方法
  • navigationParameters:導(dǎo)航傳遞參數(shù)(下面會(huì)詳解)

那么我們將上述加上回調(diào)方法：

 //在LoginContentRegion區(qū)域?qū)Ш降絃oginMainContent
 IRegion region = _regionManager.Regions[RegionNames.LoginContentRegion];
 region.RequestNavigate("LoginMainContent", NavigationCompelted);

 private void NavigationCompelted(NavigationResult result)
 {
     if (result.Result==true)
     {
         MessageBox.Show("導(dǎo)航到LoginMainContent頁(yè)面成功");
     }
     else
     {
         MessageBox.Show("導(dǎo)航到LoginMainContent頁(yè)面失敗");
     }
 }

效果如下：

二.View和ViewModel參與導(dǎo)航過(guò)程

1.INavigationAware

我們經(jīng)常在兩個(gè)頁(yè)面之間導(dǎo)航需要處理一些邏輯，例如，LoginMainContent頁(yè)面導(dǎo)航到CreateAccount頁(yè)面時(shí)候，LoginMainContent退出頁(yè)面的時(shí)刻要保存頁(yè)面數(shù)據(jù)，導(dǎo)航到CreateAccount頁(yè)面的時(shí)刻處理邏輯(例如獲取從LoginMainContent頁(yè)面的信息)，Prism的導(dǎo)航系統(tǒng)通過(guò)一個(gè)INavigationAware接口：

    public interface INavigationAware : Object
    {
        Void OnNavigatedTo(NavigationContext navigationContext);

        Boolean IsNavigationTarget(NavigationContext navigationContext);

        Void OnNavigatedFrom(NavigationContext navigationContext);
    }
  • OnNavigatedFrom：導(dǎo)航之前觸發(fā),一般用于保存該頁(yè)面的數(shù)據(jù)
  • OnNavigatedTo：導(dǎo)航后目的頁(yè)面觸發(fā)，一般用于初始化或者接受上頁(yè)面的傳遞參數(shù)
  • IsNavigationTarget：True則重用該View實(shí)例，F(xiàn)lase則每一次導(dǎo)航到該頁(yè)面都會(huì)實(shí)例化一次

我們用代碼來(lái)演示這三個(gè)方法：

LoginMainContentViewModel.cs：

public class LoginMainContentViewModel : BindableBase, INavigationAware
{
     private readonly IRegionManager _regionManager;

     private DelegateCommand _createAccountCommand;
     public DelegateCommand CreateAccountCommand =>
            _createAccountCommand ?? (_createAccountCommand = new DelegateCommand(ExecuteCreateAccountCommand));

     void ExecuteCreateAccountCommand()
     {
         Navigate("CreateAccount");
     }

     private void Navigate(string navigatePath)
     {
         if (navigatePath != null)
            _regionManager.RequestNavigate(RegionNames.LoginContentRegion, navigatePath);
     }

     public LoginMainContentViewModel(IRegionManager regionManager)
     {
          _regionManager = regionManager;
     }

     public bool IsNavigationTarget(NavigationContext navigationContext)
     {            
          return true;
     }

     public void OnNavigatedFrom(NavigationContext navigationContext)
     {
          MessageBox.Show("退出了LoginMainContent");
     }

     public void OnNavigatedTo(NavigationContext navigationContext)
     {
          MessageBox.Show("從CreateAccount導(dǎo)航到LoginMainContent");
     }
 }

CreateAccountViewModel.cs:

public class CreateAccountViewModel : BindableBase,INavigationAware
{
     private DelegateCommand _loginMainContentCommand;
     public DelegateCommand LoginMainContentCommand =>
            _loginMainContentCommand ?? (_loginMainContentCommand = new DelegateCommand(ExecuteLoginMainContentCommand));

     void ExecuteLoginMainContentCommand()
     {
         Navigate("LoginMainContent");
     }

     public CreateAccountViewModel(IRegionManager regionManager)
     {
         _regionManager = regionManager;
     }

     private void Navigate(string navigatePath)
     {
        if (navigatePath != null)
            _regionManager.RequestNavigate(RegionNames.LoginContentRegion, navigatePath);
     }

     public bool IsNavigationTarget(NavigationContext navigationContext)
     {
         return true;
     }

     public void OnNavigatedFrom(NavigationContext navigationContext)
     {
         MessageBox.Show("退出了CreateAccount");
     }

     public void OnNavigatedTo(NavigationContext navigationContext)
     {
         MessageBox.Show("從LoginMainContent導(dǎo)航到CreateAccount");
     }

 }

效果如下：

修改IsNavigationTarget為false：

public class LoginMainContentViewModel : BindableBase, INavigationAware
{
     public bool IsNavigationTarget(NavigationContext navigationContext)
     {            
          return false;
     }
}

public class CreateAccountViewModel : BindableBase,INavigationAware
{
     public bool IsNavigationTarget(NavigationContext navigationContext)
     {
         return false;
     }
 }

效果如下:

我們會(huì)發(fā)現(xiàn)LoginMainContent和CreateAccount頁(yè)面的數(shù)據(jù)不見了，這是因?yàn)榈诙螌?dǎo)航到頁(yè)面的時(shí)候當(dāng)IsNavigationTarget為false時(shí)，View將會(huì)重新實(shí)例化，導(dǎo)致ViewModel也重新加載,因此所有數(shù)據(jù)都清空了

2.IRegionMemberLifetime

同時(shí)，Prism還可以通過(guò)IRegionMemberLifetime接口的KeepAlive布爾屬性控制區(qū)域的視圖的生命周期,我們?cè)谏弦黄P(guān)于區(qū)域管理器說(shuō)到，當(dāng)視圖添加到區(qū)域時(shí)候，像ContentControl這種單獨(dú)顯示一個(gè)活動(dòng)視圖，可以通過(guò)Region的Activate和Deactivate方法激活和失效視圖，像ItemsControl這種可以同時(shí)顯示多個(gè)活動(dòng)視圖的，可以通過(guò)Region的Add和Remove方法控制增加活動(dòng)視圖和失效視圖，而當(dāng)視圖的KeepAlive為false，Region的Activate另外一個(gè)視圖時(shí)，則該視圖的實(shí)例則會(huì)去除出區(qū)域，為什么我們不在區(qū)域管理器講解該接口呢？因?yàn)楫?dāng)導(dǎo)航的時(shí)候，同樣的是在觸發(fā)了Region的Activate和Deactivate，當(dāng)有IRegionMemberLifetime接口時(shí)則會(huì)觸發(fā)Region的Add和Remove方法，這里可以去看下Prism的RegionMemberLifetimeBehavior源碼

我們將LoginMainContentViewModel實(shí)現(xiàn)IRegionMemberLifetime接口，并且把KeepAlive設(shè)置為false，同樣的將IsNavigationTarget設(shè)置為true

LoginMainContentViewModel.cs:

public class LoginMainContentViewModel : BindableBase, INavigationAware，IRegionMemberLifetime
{

     public bool KeepAlive => false;
     
     private readonly IRegionManager _regionManager;

     private DelegateCommand _createAccountCommand;
     public DelegateCommand CreateAccountCommand =>
            _createAccountCommand ?? (_createAccountCommand = new DelegateCommand(ExecuteCreateAccountCommand));

     void ExecuteCreateAccountCommand()
     {
         Navigate("CreateAccount");
     }

     private void Navigate(string navigatePath)
     {
         if (navigatePath != null)
            _regionManager.RequestNavigate(RegionNames.LoginContentRegion, navigatePath);
     }

     public LoginMainContentViewModel(IRegionManager regionManager)
     {
          _regionManager = regionManager;
     }

     public bool IsNavigationTarget(NavigationContext navigationContext)
     {            
          return true;
     }

     public void OnNavigatedFrom(NavigationContext navigationContext)
     {
          MessageBox.Show("退出了LoginMainContent");
     }

     public void OnNavigatedTo(NavigationContext navigationContext)
     {
          MessageBox.Show("從CreateAccount導(dǎo)航到LoginMainContent");
     }
 }

效果如下：

我們會(huì)發(fā)現(xiàn)跟沒(méi)實(shí)現(xiàn)IRegionMemberLifetime接口和IsNavigationTarget設(shè)置為false情況一樣，當(dāng)KeepAlive為false時(shí)，通過(guò)斷點(diǎn)知道，重新導(dǎo)航回LoginMainContent頁(yè)面時(shí)不會(huì)觸發(fā)IsNavigationTarget方法，因此可以

知道判斷順序是：KeepAlive -->IsNavigationTarget

3.IConfirmNavigationRequest

Prism的導(dǎo)航系統(tǒng)還支持再導(dǎo)航前允許是否需要導(dǎo)航的交互需求，這里我們?cè)贑reateAccount注冊(cè)完用戶后尋問(wèn)是否需要導(dǎo)航回LoginMainContent頁(yè)面，代碼如下：

CreateAccountViewModel.cs:

public class CreateAccountViewModel : BindableBase, INavigationAware，IConfirmNavigationRequest
{
     private DelegateCommand _loginMainContentCommand;
     public DelegateCommand LoginMainContentCommand =>
            _loginMainContentCommand ?? (_loginMainContentCommand = new DelegateCommand(ExecuteLoginMainContentCommand));
    
     private DelegateCommand<object> _verityCommand;
     public DelegateCommand<object> VerityCommand =>
            _verityCommand ?? (_verityCommand = new DelegateCommand<object>(ExecuteVerityCommand));

     void ExecuteLoginMainContentCommand()
     {
         Navigate("LoginMainContent");
     }

     public CreateAccountViewModel(IRegionManager regionManager)
     {
         _regionManager = regionManager;
     }

     private void Navigate(string navigatePath)
     {
        if (navigatePath != null)
            _regionManager.RequestNavigate(RegionNames.LoginContentRegion, navigatePath);
     }

     public bool IsNavigationTarget(NavigationContext navigationContext)
     {
         return true;
     }

     public void OnNavigatedFrom(NavigationContext navigationContext)
     {
         MessageBox.Show("退出了CreateAccount");
     }

     public void OnNavigatedTo(NavigationContext navigationContext)
     {
         MessageBox.Show("從LoginMainContent導(dǎo)航到CreateAccount");
     }
    
     //注冊(cè)賬號(hào)
     void ExecuteVerityCommand(object parameter)
     {
         if (!VerityRegister(parameter))
         {
                return;
         }
         MessageBox.Show("注冊(cè)成功!");
         LoginMainContentCommand.Execute();
     }
    
     //導(dǎo)航前詢問(wèn)
     public void ConfirmNavigationRequest(NavigationContext navigationContext, Action<bool> continuationCallback)
     {
         var result = false;
         if (MessageBox.Show("是否需要導(dǎo)航到LoginMainContent頁(yè)面?", "Naviagte?",MessageBoxButton.YesNo) ==MessageBoxResult.Yes)
         {
             result = true;
         }
         continuationCallback(result);
      }
 }

效果如下：

三.導(dǎo)航期間傳遞參數(shù)

Prism提供NavigationParameters類以幫助指定和檢索導(dǎo)航參數(shù)，在導(dǎo)航期間，可以通過(guò)訪問(wèn)以下方法來(lái)傳遞導(dǎo)航參數(shù)：

  • INavigationAware接口的IsNavigationTarget，OnNavigatedFrom和OnNavigatedTo方法中IsNavigationTarget，OnNavigatedFrom和OnNavigatedTo中形參NavigationContext對(duì)象的NavigationParameters屬性
  • IConfirmNavigationRequest接口的ConfirmNavigationRequest形參NavigationContext對(duì)象的NavigationParameters屬性
  • 區(qū)域?qū)Ш降?strong>INavigateAsync接口的RequestNavigate方法賦值給其形參navigationParameters
  • 導(dǎo)航日志IRegionNavigationJournal接口CurrentEntry屬性的NavigationParameters類型的Parameters屬性(下面會(huì)介紹導(dǎo)航日志)

這里我們CreateAccount頁(yè)面注冊(cè)完用戶后詢問(wèn)是否需要用當(dāng)前注冊(cè)用戶來(lái)作為登錄LoginId，來(lái)演示傳遞導(dǎo)航參數(shù)，代碼如下：

CreateAccountViewModel.cs(修改代碼部分):

private string _registeredLoginId;
public string RegisteredLoginId
{
    get { return _registeredLoginId; }
    set { SetProperty(ref _registeredLoginId, value); }
}

public bool IsUseRequest { get; set; }

void ExecuteVerityCommand(object parameter)
{
    if (!VerityRegister(parameter))
    {
        return;
    }
    this.IsUseRequest = true;
    MessageBox.Show("注冊(cè)成功!");
    LoginMainContentCommand.Execute();
}   

public void ConfirmNavigationRequest(NavigationContext navigationContext, Action<bool> continuationCallback)
{
    if (!string.IsNullOrEmpty(RegisteredLoginId) && this.IsUseRequest)
    {
         if (MessageBox.Show("是否需要用當(dāng)前注冊(cè)的用戶登錄?", "Naviagte?", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
         {
              navigationContext.Parameters.Add("loginId", RegisteredLoginId);
         }
    }
    continuationCallback(true);
}

LoginMainContentViewModel.cs(修改代碼部分):

public void OnNavigatedTo(NavigationContext navigationContext)
{
     MessageBox.Show("從CreateAccount導(dǎo)航到LoginMainContent");
            
     var loginId= navigationContext.Parameters["loginId"] as string;
     if (loginId!=null)
     {
         this.CurrentUser = new User() { LoginId=loginId};
     }
            
 }

效果如下：

四.導(dǎo)航日志

Prism導(dǎo)航系統(tǒng)同樣的和WPF導(dǎo)航系統(tǒng)一樣，都支持導(dǎo)航日志，Prism是通過(guò)IRegionNavigationJournal接口來(lái)提供區(qū)域?qū)Ш饺罩竟δ埽?/p> 

    public interface IRegionNavigationJournal
    {
        bool CanGoBack { get; }

        bool CanGoForward { get; }

        IRegionNavigationJournalEntry CurrentEntry {get;}

        INavigateAsync NavigationTarget { get; set; }

        void GoBack();

        void GoForward();

        void RecordNavigation(IRegionNavigationJournalEntry entry, bool persistInHistory);

        void Clear();
    }

我們將在登錄界面接入導(dǎo)航日志功能,代碼如下:

LoginMainContent.xaml(前進(jìn)箭頭代碼部分):

<TextBlock Width="30" Height="30" HorizontalAlignment="Right" Text="&#xe624;" FontWeight="Bold" FontFamily="pack://application:,,,/PrismMetroSample.Infrastructure;Component/Assets/Fonts/#iconfont" FontSize="30" Margin="10" Visibility="{Binding IsCanExcute,Converter={StaticResource boolToVisibilityConverter}}">
      <i:Interaction.Triggers>
           <i:EventTrigger EventName="MouseLeftButtonDown">
                 <i:InvokeCommandAction Command="{Binding GoForwardCommand}"/>
            </i:EventTrigger>
      </i:Interaction.Triggers>
      <TextBlock.Style>
           <Style TargetType="TextBlock">
                <Style.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                          <Setter Property="Background" Value="#F9F9F9"/>
                    </Trigger>
                 </Style.Triggers>
            </Style>
      </TextBlock.Style>
 </TextBlock>

BoolToVisibilityConverter.cs:

public class BoolToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
          if (value==null)
          {
              return DependencyProperty.UnsetValue;
          }
          var isCanExcute = (bool)value;
          if (isCanExcute)
          {
              return Visibility.Visible;
          }
          else
          {
              return Visibility.Hidden;
          }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
            throw new NotImplementedException();
    }
 }

LoginMainContentViewModel.cs(修改代碼部分):

IRegionNavigationJournal _journal;

private DelegateCommand<PasswordBox> _loginCommand;
public DelegateCommand<PasswordBox> LoginCommand =>
            _loginCommand ?? (_loginCommand = new DelegateCommand<PasswordBox>(ExecuteLoginCommand, CanExecuteGoForwardCommand));

private DelegateCommand _goForwardCommand;
public DelegateCommand GoForwardCommand =>
            _goForwardCommand ?? (_goForwardCommand = new DelegateCommand(ExecuteGoForwardCommand));

private void ExecuteGoForwardCommand()
{
    _journal.GoForward();
}

private bool CanExecuteGoForwardCommand(PasswordBox passwordBox)
{
    this.IsCanExcute=_journal != null && _journal.CanGoForward;
    return true;
}

public void OnNavigatedTo(NavigationContext navigationContext)
{
     //MessageBox.Show("從CreateAccount導(dǎo)航到LoginMainContent");
     _journal = navigationContext.NavigationService.Journal;

     var loginId= navigationContext.Parameters["loginId"] as string;
     if (loginId!=null)
     {
                this.CurrentUser = new User() { LoginId=loginId};
     }
     LoginCommand.RaiseCanExecuteChanged();
}

CreateAccountViewModel.cs(修改代碼部分):

IRegionNavigationJournal _journal;

private DelegateCommand _goBackCommand;
public DelegateCommand GoBackCommand =>
            _goBackCommand ?? (_goBackCommand = new DelegateCommand(ExecuteGoBackCommand));

void ExecuteGoBackCommand()
{
     _journal.GoBack();
}

 public void OnNavigatedTo(NavigationContext navigationContext)
 {
     //MessageBox.Show("從LoginMainContent導(dǎo)航到CreateAccount");
     _journal = navigationContext.NavigationService.Journal;
 }

效果如下：

選擇退出導(dǎo)航日志

如果不打算將頁(yè)面在導(dǎo)航過(guò)程中不加入導(dǎo)航日志，例如LoginMainContent頁(yè)面，可以通過(guò)實(shí)現(xiàn)IJournalAware并從PersistInHistory（）返回false

    public class LoginMainContentViewModel : IJournalAware
    {
        public bool PersistInHistory() => false;
    }

五.小結(jié)：

prism的導(dǎo)航系統(tǒng)可以跟wpf導(dǎo)航并行使用，這是prism官方文檔也支持的，因?yàn)閜rism的導(dǎo)航系統(tǒng)是基于區(qū)域的，不依賴于wpf，不過(guò)更推薦于單獨(dú)使用prism的導(dǎo)航系統(tǒng)，因?yàn)樵贛VVM模式下更靈活，支持依賴注入,通過(guò)區(qū)域管理器能夠更好的管理視圖View,更能適應(yīng)復(fù)雜應(yīng)用程序需求，wpf導(dǎo)航系統(tǒng)不支持依賴注入模式，也依賴于Frame元素，而且在導(dǎo)航過(guò)程中也是容易強(qiáng)依賴View部分，下一篇將會(huì)講解Prism的對(duì)話框服務(wù)

六.源碼

?最后，附上整個(gè)demo的源代碼：PrismDemo源碼

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