I have

1. Page1.xaml

   <Label x:Name="getPreferences" />
   <Button x:Name="one" Clicked="one_Clicked"/>
   

2. Page1.xaml.cs

   public Page1()
   {
       string getpre = Preferences.Get("PreOne", "defaultpre");
       getPreferences.Text = getpre;
   }
   private async void one_Clicked(object sender, EventArgs e)
   {
      PopupNavigation.Instance.PushAsync(new Popup());
   }
   

3. Popup.xaml (using Rg Popup)

   <popup:PopupPage
     ....
     <StackLayout x:Name="ss">
                    <Image Source="img"/>
                    <Label Text="Testtttt" />
                    <StackLayout.GestureRecognizers>
                        <TapGestureRecognizer Tapped="ss_Tapped" />
                    </StackLayout.GestureRecognizers>
                </StackLayout>
   </popup:PopupPage>
   

4. Popup.xaml.cs

   private void ss_Tapped(object sender, EventArgs e)
   {
      string setone = "01";
      Preferences.Set("PreOne", setone);
   }
   

How can I get the value of Preferences to assign to the Label getPreferences without me having to reload the page Page1. Please help. Thank you

CodePudding user response：

Try using ViewModels and bindings so that all these things happen automatically

CodePudding user response：

Preferences Essential package have no event for changing preferences , so you have to get your value every time you change it . i suggest you to create your own event in popup and fire it when your value changed

1.PopUp.xaml.cs

    public event EventHandler PreOneChanged; 
    private void ss_Tapped(object sender, EventArgs e)
    {
        string setone = "01";
        Preferences.Set("PreOne", setone);
        PreOneChanged?.Invoke(setone,EventArgs.Empty);
    }

2.Page1.xaml.cs

    public Page1()
    {
        Init();
    }

    private void Init()
    {
        string getpre = Preferences.Get("PreOne", "defaultpre");
        getPreferences.Text = getpre;
    }
    private async void one_Clicked(object sender, EventArgs e)
    {
        var popUp = new Popup();
        popUp.PreOneChanged  = (ss, ee) =>
        {
            Init();
        };
        PopupNavigation.Instance.PushAsync(popUp);

    }

Now when your value changed in PopUp your event call and in page will change that