Prism和Xamarin。表单:IApplicationLifecycle

我有一个viewmodel,它继承自BindableBase并实现IApplicationLifecycle。但是,IApplicationLifecycle。OnResume()和IApplicationLifecycle。OnSleep()在iOS和android上都没有被调用。

如何使用IApplicationLifecycle?我似乎找不到它的任何文档。提前感谢!

在我的应用程序中。xaml。cs我有:

NavigationService.NavigateAsync("NavigationPage/MainPage");

和我的主页。xaml如下所示:

<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         xmlns:local="clr-namespace:PrismApp.Views;assembly=PrismApp"
         xmlns:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
         prism:ViewModelLocator.AutowireViewModel="True"
         x:Class="PrismApp.Views.MainPage"
         Title="MainPage">

<TabbedPage.Children>
    <local:APage Icon="tabicon_mapspage.png" />
    <local:BPage Icon="tabicon_profilepage.png" />
    <local:CPage Icon="tabicon_statuspage.png" />
</TabbedPage.Children>

最后,我的MainPageViewModel如下所示:

public class MainPageViewModel : BindableBase, IApplicationLifecycle
{
    private string _title;
    public string Title
    {
        get { return _title; }
        set { SetProperty(ref _title, value); }
    }
    public void OnResume()
    {
        var debug = 42;
    }

    public void OnSleep()
    {
        var debug = 42;
    }
}

https://github.com/RandomStuffAndCode/PrismApp