FreshMvvm | FreshMvvm is a super light Mvvm Framework | Form library

I need to set two ViewModels from the code behind in the xaml code. Or if there is better way doing would be great to.

When I do it like this way the application crashes. When I set ProductDetailViewModel in the code behind (BindingContext = ViewModel) everything works fine.

update It's not an good idea to pass viewModels as parameters. I have now one class "ViewModelLocator" which contains all the ViewModels as static properties. Use Google for more info. This way things are way easier.

example ViewModelLocator

I have a mobile app with Xamarin.Forms and FreshMvvm. Every page uses a control template defined in App.xaml:

I have a Xamarin.Forms application using FreshMVVM. Can anybody tell me if I can use binding to handle changing the PageModel in Page's code-behind? E.g. if an event happens in the PageModel like this:

I am trying to implement a xamarin app that will have a MainPage like a container that will host the rest of my pages(as content view?).

MainPage.xaml

I have implemented tabbed navigation using FreshMVVM. When my app launches, I could notice that the 'ViewIsAppearing' method is getting invoked for all the tabs. However, if I switch to one tab, the 'ViewIsAppearing' method in its ViewModel is not getting called. If go to some other tab and switch back to this same tab, then it works. i.e. 'ViewIsAppearing' is not getting invoked in the initial tab change click. How do I make it invoke in the first attempt itself. I have come across a github issue similar to this. Just adding for reference https://github.com/xamarin/Xamarin.Forms/issues/3855

I have a Xamarin.Forms app with FreshMvvm, and I use secondary ToolbarItems. To do it in iOS, I had to make a custom renderer (unlike in Android). I was given a solution on how to implement it here: ToolbarItems do not look right in iOS

This solution works perfectly for me. But by now, the toolbar menu grew longer, and some of its elements do not fit the iPhone's screen. I can slide the menu and see all the elements, but as soon as I release the screen, the view jumps back up, and while it is held by a finger, the elements are not clickable. How can this be solved? Can the menu made to wrap, or something else? On Android, the menu stays where I scroll and I can click every item. Can it made stay where scrolled on iOS, too?

Here is my renderer's code:

I have a Xamarin.Forms application, and it uses FreshMvvm. I have two picker controls for selecting countries and states/provinces. The picker of countries is populated initially, but the list of states/provinces should be populated on the fly based on the selected country. I cannot find how it can be done using command and not code-behind event handling. Here are my controls in MyPage.xaml:

• FreshMVVM 3.0.0
• Xamarin Forms 4.2

A number of our input pages are loaded modally and when the user presses Save we execute a Command like this

With WPF I use "MVVM Light Toolkit from galasoft" but with Xamarin does it bring more functionality or simplicity to use a MVVM framework ?

And which framework is best all by being simple ?

I saw that there was "freshmvvm" but it seems that there are quite a few basic things.