Xamarin Forms - passing value from Xaml.cs to custom renderer

Question

I have a page called MapPage.Xaml.cs and on that page's constructor I have an argument called bool isFireHazard. In my Custom Renderer CustomMapRenderer.cs in my Android project, I want to check that boolean to see whether it is true.

How do I reference this boolean from my custom renderer?

Where are you use CustomMapRenderer - before MapPage or on this page? — FetFrumos, Jul 28 '17 at 06:59
You will have to show some more code if you want us to be able to help you — Gerald Versluis, Jul 28 '17 at 07:30

score 3 · Answer 1 · answered Jul 30 '17 at 19:25

You need to store isFireHazard passed to constructor in CustomMap object member. Then in CustomMapRenderer you can access it as

protected override void OnElementChanged (ElementChangedEventArgs<xxx> e)
    {
       base.OnElementChanged(e);

       if (e.NewElement != null)
       {
          var formsMap = (CusomMap)e.NewElement;
          if(formsMap.isFireHazard)
          {
          }
       }
    }

Xamarin Forms - passing value from Xaml.cs to custom renderer

1 Answers1