我有三页,我在第二页上输入数据,并将其传输到第一页,同时返回它,这没有问题,我使用导航,如下所示:
private async void OnSaveTitleButtonCliked(object sender, EventArgs e)
{
var title_data = new LabelViewModel
{
Label = editor.Text,
Date = DateTime.Now
};
var mainpage = new MainPage();
mainpage.BindingContext = title_data;
await Navigation.PushAsync(mainpage);
}
但是我还需要将此数据传输到第三页,以便可以从第一页转到那里,看到我尝试了mvvm,但是到目前为止我还不了解它是如何工作的。请告诉我如何做得更好:)
我在这里让一些例子
在第一页上(称为第二页)
private async void MenuLista(object sender, EventArgs e)
{
var item = (ModelosPPP)((Button)sender).BindingContext;
if (PopupRunnning != false)
return;
var page = new MenuListSV(item);
PopupRunnning = true;
page.Action += async (a, b) =>
{
switch (b)
{
case 1:
await DisplayAlert("PDF", null, "ok");
break;
case 2:
await DisplayAlert("Reenviar", null, "ok");
break;
case 3:
await DisplayAlert("Excluir", null, "ok");
break;
}
};
page.Disappearing += (c, d) =>
{
PopupRunnning = false;
};
await PopupNavigation.Instance.PushAsync(page);
}
第二页
public partial class MenuListSV : PopupPage
{
public MenuListSV(Models.ModelosPPP obj)
{
InitializeComponent();
BindingContext = obj;
}
public EventHandler<int> Action;
public async void MenuChoice(object sender, EventArgs e)
{
var btn = sender as Button;
switch (btn.Text)
{
case "Abrir PDF":
Action?.Invoke(this, 1);
break;
case "Reenviar":
Action?.Invoke(this, 2);
break;
case "Excluir":
Action?.Invoke(this, 3);
break;
}
await PopupNavigation.Instance.PopAsync();
}
}