使用Mono droid和slodge mvvmcross从堆栈中删除活动 [英] Remove activity from stack using Mono droid and slodge mvvmcross

问题描述

我正在尝试找到一种从堆栈中删除活动的方法-我们的应用程序中包含以下流程:活动/视图模型a->活动/视图模型b->活动/视图模型c.在c中，用户可以选择日期或返回.如果他回去，他应该回到b.但是，如果他选择日期，则将其转至活动/视图模型b的新实例，活动/视图模型b的旧"实例已过时，应删除.

I am trying to find a way to remove an activity from the stack- We have a flow in our app: activity/viewmodel a -> activity/viewmodel b ->activity/viewmodel c. In c the user have the posibility of choosing a date or go back. If he goes back he should be returned to b. However if he chooses a date he is fowarded to a new instance of activity/viewmodel b and the "old" instance of activity/viewmodel b is obsolete and should be removed.

Stuart Lodge的一个建议(在类似的线程上，仅用于单点触摸)是使用RequestRemoveBackStep()，但我不确定如何使用它，因此找不到示例.

A suggestion from Stuart Lodge (on a similar thread, just for mono touch) was to use RequestRemoveBackStep() but I am not sure how to use it and I cant find an example.

有人能指出我正确的方向吗?

Can anyone point me in the right direction?

致谢

推荐答案

RequestRemoveBackStep()方法是IMvxViewDispatcher接口的成员，并且在某些平台上实现:

The RequestRemoveBackStep() method is a member of the IMvxViewDispatcher interface and is implemented on some platforms:

public interface IMvxViewDispatcher : IMvxMainThreadDispatcher
{
    bool RequestNavigate(MvxShowViewModelRequest request);
    bool RequestClose(IMvxViewModel whichViewModel);
    bool RequestRemoveBackStep();
}

来自 https://github .com/slodge/MvvmCross/blob/vnext/Cirrious/Cirrious.MvvmCross/Interfaces/Views/IMvxViewDispatcher.cs

但是，始终执行此操作并不完全简单...例如，在Droid上，当前实现为:

However, its not entirely simple to always do this... so on Droid, for example, it is currently implemented as:

    public bool RequestRemoveBackStep()
    {
        // not supported on Android? Not sure how to do this currently...
        return false;
    }

来自 https://github .com/slodge/MvvmCross/blob/vnext/Cirrious/Cirrious.MvvmCross.Droid/Views/MvxAndroidViewDispatcher.cs

有关此功能的记录的问题-例如 https://github.com/slodge/MvvmCross/issues/80 -但似乎很有可能该功能可能会从将来的Mvx实现中删除，尤其是因为在每个平台上对每个视图进行此操作都不容易.

There are issues logged about this functionality - e.g. https://github.com/slodge/MvvmCross/issues/80 - but it seems likely that this functionality might simply be dropped from future Mvx implementations - especially as it's not very easy to do for every view on every platform.

如果您现在需要这种类型的功能，那么您将需要找到自己的实现此功能的方式...具体取决于您的特定用例(抱歉，当前用例的详细信息尚不明确)从问题中使我明白).

If you need this type of functionality now, then you'll need to find your own way of implementing this functionality... depending on what your specific use case is (sorry - the details of your current use case aren't clear to me from the question).

有几种可用的技术路线，包括:

There are several technical routes available including:

• 使用NoHistory标志
• 使用RequestClose(oldviewModel)通话
• 向您的Presenter
添加逻辑
• 使用Messenger请求视图关闭自身.

• using NoHistory flags
• using RequestClose(oldviewModel) calls
• adding logic to your Presenter
• using a Messenger to request views close themselves.

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