How to transfer data from one page to another xamarin - xamarin

Question

I have three pages, I enter the data on the second page and transfer it to page number one, returning to it at the same time, there is no problem with this, I use navigation, like this:
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);
}
But I also need to transfer this data to page number three, so that I can go there from the first page and see, I tried the mvvm, but so far I have not understood how it works.
Please tell me how to do it better:)

Answer 1

Pass data by constructor:
In Page1:
private async void GoToPage2(object sender, EventArgs e)
{
var title_data = new LabelViewModel
{
Label = editor.Text,
Date = DateTime.Now
};
//Pass the model here
var Page2 = new Page2(title_data);
await Navigation.PushAsync(Page2);
}
In Page2:
public partial class Page2 : ContentPage
{
public LabelViewModel model;
public Page2(LabelViewModel m) {
InitializeComponent();
this.model = m;
//You can use your model here
}
}
Pass data by public property:
In Page1:
private async void GoToPage2(object sender, EventArgs e)
{
var title_data = new LabelViewModel
{
Label = editor.Text,
Date = DateTime.Now
};
var Page2 = new Page2();
//Pass the model here
Page2.model = title_data;
await Navigation.PushAsync(Page2);
}
In Page2:
public partial class Page2 : ContentPage
{
public LabelViewModel model;
public Page2()
{
InitializeComponent();
//You can use your model here
Console.WriteLine(model.Label);
Console.WriteLine(model.Date);
}
}
Let me know if you have any questions.

Answer 2

I'll let some examples here
On the first page (who calls the second one)
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);
}
in Second Page
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();
}
}