Xamarin.iOS ReactiveUI ReactiveTableViewCell Not Binding

Question

I am working on a Xamarin.iOS app and I am new to ReactiveUI.

I'm trying to bind some properties in a custom table cell that implements ReactiveTableViewCell and IViewFor<> .

The examples I have seen just show binding to the TextLabel.Text , which works fine for me, but when trying to bind to other properties on the table cell that was generated in the UI designer, nothing binds/displays.

The setup is very similar to ReactiveTableViewSource-Sample however I am trying to bind to a label I placed using the designer rather than the default TextLabel.Text .

Here is my call to bind the table to the custom tablecell.

ViewModel.WhenAnyValue(vm => vm.SearchResults)
    .BindTo<AgentSearchResult, AgentSearchResultsTableCell>
    (agentsTableView, 64, cell => cell.Initialize());

Here is my Initialize method in the custom tablecell.

public void Initialize()
{
    this.WhenAnyValue(v => v.ViewModel.Name).BindTo
        (this, v => v.lblName.Text); // Doesn't Work
    this.WhenAnyValue(v => v.ViewModel.Name).BindTo
        (this, v => v.TextLabel.Text); // Works
    this.WhenAnyValue(v => v.ViewModel.Agency).BindTo
        (this, v => v.lblCompany.Text);
    this.WhenAnyValue(v => v.ViewModel.Phone).BindTo
        (this, v => v.lblPhone.Text);
    this.WhenAnyValue(v => v.ViewModel.Email).BindTo
        (this, v => v.lblEmail.Text);

}

• Default TextLabel.Text binds, but additional properties won't bind/display on table view.

Answer 1

Ok, I was able to get this working. It was a rather simple fix but I just didn't see any examples/documentation for it.

The issue was that any items added with the designer were null.

Here is how I fixed it with Storyboards using the designer:

1. Ensure you set an Identifier for the prototype cell that you mocked up.
   Set TableViewCell Identifier

2. Update the binding in your ViewController for the TableView to include the CellKey.

    ViewModel.WhenAnyValue(vm => vm.SearchResults).BindTo<AgentSearchResult, AgentSearchResultsTableCell>(agentsTableView, new NSString("AgentSearchResultsCell"), 64, cell => cell.Initialize()); 

After making these changes the databinding worked perfectly.