如何将ViewModel绑定到MvvmCross中的Windows 8“设置"窗格? [英] How do you bind a ViewModel to the Windows 8 Settings pane in MvvmCross?

问题描述

我一直在寻找用于跨平台移动开发的MvvmCross.

I've been looking at MvvmCross for cross platform mobile development.

由于视图导航是通过调用ShowViewModel<>()完成的，因此您将如何在Windows 8中使用MvvmCross创建设置窗格(是用户控件)?

Since navigation of views is done by calling ShowViewModel<>(), how would you create the settings pane (which is a user control) in Windows 8 using MvvmCross?

推荐答案

MvvmCross提供了一种通用的ShowViewModel<T>导航机制，该机制使用Presenter在View上显示和设置DataContext.以这种方式显示的视图通常会覆盖整个屏幕"，并受益于使用CIRS自动构建的ViewModel(请参见

MvvmCross provides a general ShowViewModel<T> navigation mechanism which uses a Presenter to display and set the DataContext on Views. Views that are shown this way typically cover the 'whole screen' and benefit from automatically constructed ViewModels using CIRS (see http://slodge.blogspot.co.uk/2013/03/v3-new-viewmodel-lifecycle.html)

但是，仅因为导航通常是使用ShowViewModel<T>完成的，所以这并不妨碍您以其他方式使用ViewModels. ShowViewModel<T>机制的常见例外是诸如iOS Tabbed和SplitView子代，WindowsPhone Pivot/全景项，Android子片段和对话框以及Windows8子窗格(如弹出按钮)之类的东西.

However, just because navigation is typically done using ShowViewModel<T> this doesn't prevent you from using ViewModels in other ways. Common exceptions to the ShowViewModel<T> mechanism are things like iOS Tabbed and SplitView children, WindowsPhone Pivot/Panorama items, Android sub-Fragments and Dialogs, and Windows8 sub-panes such as flyouts.

在Windows8的实践水平上，每个XAML UserControl都有一个DataContext属性，可以在代码中进行设置-这样您就可以始终:

At a practical level in Windows8, every XAML UserControl has a DataContext property which you can set in code - so you can always:

• 在代码中创建任何UserControl
• 然后创建一个ViewModel
  • 使用new，
  • 使用Mvx.IoCConstruct<TViewModel>()
  • 或使用Mvx.Resolve<IMvxViewModelLoader>().LoadViewModel(request, state)
  • create any UserControl in code
  • then create a ViewModel
    • using new,
    • using Mvx.IoCConstruct<TViewModel>()
    • or using Mvx.Resolve<IMvxViewModelLoader>().LoadViewModel(request, state)

    在代码中执行此操作的位置...无论使用后台代码，某些Messenger-Message接收器还是其他机制-完全由您决定-但这是适合放入UI代码中的方法项目-绝对是View的关注点.

    Where you do this in your code... whether you use page code-behind, some Messenger-Message receiver or some other mechanism - well that's up to you - but this is something which is appropriate to put into the UI code project - it's definitely a View concern.

    最后要说的是...虽然设置窗格确实是UserControl，但LayoutAwarePage也是UserControl-因此您也可以在弹出菜单中使用LayoutAwarePage-但不要希望看到在执行时调用的OnNavigatedTo调用-例如请参见 http://code.msdn.microsoft.com/中的SettingsFlyout windowsapps/App-settings-sample-1f762f49

    One final aside... while it is true that the settings pane is a UserControl, a LayoutAwarePage is also a UserControl too - so you can use LayoutAwarePage in flyouts too - but don't expect to see the OnNavigatedTo calls invoked when you do - e.g. see SettingsFlyout in http://code.msdn.microsoft.com/windowsapps/App-settings-sample-1f762f49

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