Question

I’m in the process of trying to create a binding for the WikitudeAPI in order to provide AR capabilities in my app.

So far I’ve tried to keep it very simple, I’m just binding a few of the methods and the minimum of classes. One of the classes is declared as such

@interface WTPoi : NSObject<MKAnnotation> {

}

To create the binding I’ve declared my binding as

using MonoTouch.Foundation;
using MonoTouch.MapKit;
namespace AR {
  [BaseType(typeof(MKAnnotation))]
  interface WTPoi {
  }
}

When I run btouch against it I get the an abort trap error
“line 2: 1959 Abort trap”

I’ve tried using other types as the BaseType just to see and they mostly work, any ideas as to what I’m doing wrong?

Answer 1

Turns out that its a bug in the [Model] inheritance in btouch.

Declaring the interface as:

namespace AR {
    [BaseType(typeof(NSObject))]
    public interface WTPoi {
        [Export ("coordinate")]
        CLLocationCoordinate2D Coordinate { get; set; }

        [Export ("title")]
        string Title { get; }

        [Export ("subtitle")]
        string Subtitle { get; }
    }  
}

Works fine but you lose the inheritance from MKAnnotation.