Pass Value by PopAsync

Warwenczack

There's any way to pass value with an PopAsync ?

AlessandroCaliaro

I think no...

You can use MessagingCenter to send data from B (send) to A (receive)

Otherwise you can pass A's ViewModel to B, modify it so it should result modified after PopAsync

AlessandroCaliaro

I think no...

You can use MessagingCenter to send data from B (send) to A (receive)

Otherwise you can pass A's ViewModel to B, modify it so it should result modified after PopAsync

NMackay

Not that I know off, If your looking at an MVVM Framework at some stage then Prism makes this really easy and allows you to pass parameters back to the previous page/viewmodel.

Warwenczack

@NMackay said:
Not that I know off, If your looking at an MVVM Framework at some stage then Prism makes this really easy and allows you to pass parameters back to the previous page/viewmodel.

with Bindings ?

Warwenczack

Let me explain better my situation...

I Have two pages (A) and (B),
in a (A) page, i click on a searchBox and send to the page (B) with the value to search,
at my (B) page, load a listView with the searched items,
i want to select a value in the (B) page and confirm,
after this at my (A) page the comboBox will be setted with the value...

AlessandroCaliaro

Pass A's ViewModel to B

in A's ViewModel should exist a Property in Binding with the ComboBox

B should set to "true" the Property

It should work

NMackay

@Warwenczack

Yes, I pass bound objects as parameters via the navigation service to other view models, just look at the parameters dictionary when the VM A is navigated back to and set whatever binding you want.

You can pass the entire view model I guess but that can get pretty heavy.

NMackay

I'm not plugging Prism btw, I just know it makes this kind of scenario really easy and clean to implement.

Warwenczack

@NMackay said:

@Warwenczack

Yes, I pass bound objects as parameters via the navigation service to other view models, just look at the parameters dictionary when the VM A is navigated back to and set whatever binding you want.

You can pass the entire view model I guess but that can get pretty heavy.

I'm trying to understand some concepts, there's no much time that I work with Xamarin ...

Velocity

You could also use RX observables aka Reactive UI.
If you are desperate, you could probably extend NavigationPage and write a custom PopAsync method which accepts arguments to pass back to the next page. But, I wouldn't recommend this.

Warwenczack

@AlessandroCaliaro said:
I think no...

You can use MessagingCenter to send data from B (send) to A (receive)

Otherwise you can pass A's ViewModel to B, modify it so it should result modified after PopAsync

Thanks!