问题描述
我创建了新的ContentView。
[XamlCompilation(XamlCompilationoptions.Compile)]
public partial class LoadingOverlay : MvxContentView<LoadingOverlayviewmodel> {
public LoadingOverlay()
{
InitializeComponent();
}
}
XAML:
<?xml version="1.0" encoding="utf-8" ?>
<views:MvxContentView x:TypeArguments="viewmodels:LoadingOverlayviewmodel"
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:views="clr-namespace:MvvmCross.Forms.Views;assembly=MvvmCross.Forms"
xmlns:mvx="clr-namespace:MvvmCross.Forms.Bindings;assembly=MvvmCross.Forms"
xmlns:local="clr-namespace:SomeApp.UI.Pages"
x:Class="SomeApp.UI.Layout.LoadingOverlay"
NavigationPage.HasNavigationBar="False"
xmlns:viewmodels="clr-namespace:SomeApp.Core.viewmodels;assembly=SomeApp.Core">
<ContentView.Content>
</ContentView.Content>
</views:MvxContentView>
当我尝试从另一个viewmodel导航到该视图时,出现NullReferenceException。
public Homeviewmodel(IMvxNavigationService navigationService)
{
navigationService.Navigate<LoadingOverlayviewmodel>();
}
LoadingOverlayviewmodel看起来像:
public class LoadingOverlayviewmodel : Mvxviewmodel
{
private bool _isVisible;
public bool IsVisible
{
get => _isVisible;
set => SetProperty(ref _isVisible,value);
}
public LoadingOverlayviewmodel()
{
}
public override async Task Initialize()
{
await base.Initialize();
await Task.Yield();
}
}
解决方法
暂无找到可以解决该程序问题的有效方法,小编努力寻找整理中!
如果你已经找到好的解决方法,欢迎将解决方案带上本链接一起发送给小编。
小编邮箱:dio#foxmail.com (将#修改为@)