User115237 postedHi @adamkemp,
I got the same exception in my project. I read all of the comment, but the problem is I am not the author of the project I am working on and I have a hard time fixing this issue. So my exception comes from a custom map renderer in iOS. In my OnElementChanged function.
protected override void OnElementChanged(Xamarin.Forms.Platform.iOS.ElementChangedEventArgs<View> e)
{
base.OnElementChanged(e);
if (e.NewElement != null) {
var mapView = (MKMapView)Control;
mapView.WeakDelegate = new MyMapDelegate((MyMap)Element);
}
}
Here a new MKMapViewDelegate subclass is assigned to the WeakDelegate of the mapView as per in this recipe HERE.
And this is how my delegate is looking:
protected class MyMapDelegate : MKMapViewDelegate {
public MyMapDelegate(MyMap map) {
// some stuff
}
public override void DidSelectAnnotationView(MKMapView mapView, MKAnnotationView view)
{
// some stuff
}
public override void DidDeselectAnnotationView(MKMapView mapView, MKAnnotationView view)
{
// some stuff
}
public override MKAnnotationView GetViewForAnnotation (MKMapView mapView, IMKAnnotation annotation)
{
// some stuff
}
protected override void Dispose(bool disposing)
{
// some stuff
}
// as an optimization, you should override this method to add or remove annotations as the
// map zooms in or out.
public override void RegionChanged (MKMapView mapView, bool animated) {}
}
The fix, again, is to pick: either always use events with that object or never use events. Don't mix them at all, even if you don't ever use them at the same time.
As I understood I should not mix events and delegates but here in the code I see only a delegate and no events. Why is it throwing an error when I don't use any events?
Thanks in advice :)
