如何从Multiplatform iOS Xamarin项目中的多个选项卡访问数据

Question

I created a new project by doing File -> New Solution -> Multiplatform -> App -> Native -> Native App in Visual Studio. I am focusing on the iOS side of things.

I am trying to modify this project. In the second tab of the generated app, I need to access all of the Items. Reusing ItemsViewModel seemed like a logical choice. However, the problem is that when I update the data in the second tab, changes are not reflected in the first tab, which is using a separate instance of ItemsViewModel in its respective ViewController.

My questions are:

1. Is there an easy way to have changes in one tab appear in the other?
2. Is it possible for the two tabs to share the same instance of the ItemsViewModel?
3. Is there a completely different solution?

Answer 1

I solved this by creating a single instance of the ViewModel in the TabBarController. In ViewDidLoad for each of the two ViewControllers where I needed the instance, I accessed the TabBarController's instance.