Once again thanks to a hint from Geoff, I've pieced a little more of MapKit together. This has been tested with RC2 of MonoTouch. The trick? It ONLY WORKS ON THE DEVICE - the simulator will 'crash' with the Stack Trace shown at the bottom of this post (I'm sure this will be fixed in a future release).
This code in
FinishedLaunchingOnce again, use the 'new' AddAnnotationObject method.
mapView.Delegate = new MapViewDelegate(this);with this
MyAnnotation a = new MyAnnotation(
new CLLocationCoordinate2D(-33.867139,151.207114)
, "Home"
, "is where the heart is"
);
Console.WriteLine(" ### This breaks in the simulator BUT it works on device!!!");
mapView.AddAnnotationObject(a);
MKAnnotation subclassIn MonoTouch
MKAnnotation is an abstract class, but in ObjectiveC it's a @protocol. This kinda explains why everything in the class is read-only - @protocols are akin to interfaces in C#, but they cannot be "modelled" as interfaces in MonoTouch because @protocols members can be optional! The simplest way to get an annotation is therefore this implementation (although I think you could also create your own subclass of NSObject and Export() the MKAnnotation members manually).public class MyAnnotation : MKAnnotationand this
{
private CLLocationCoordinate2D _coordinate;
private string _title, _subtitle;
public override CLLocationCoordinate2D Coordinate {
get { return _coordinate; }
}
public override string Title {
get { return _title; }
}
public override string Subtitle {
get { return _subtitle; }
}
/// <summary>
/// Need this constructor to set the fields, since the public
/// interface of this class is all READ-ONLY
/// <summary>
public MyAnnotation (CLLocationCoordinate2D coord,
string t, string s) : base()
{
_coordinate=coord;
_title=t;
_subtitle=s;
}
}
MKMapViewDelegate implementationpublic class MapViewDelegate : MKMapViewDelegate
{
private AppDelegate _appd;
public MapViewDelegate (AppDelegate appd):base()
{
_appd = appd;
}
///
/// When user moves the map, update lat,long text in label
///
public override void RegionChanged
(MKMapView mapView, bool animated)
{
Console.WriteLine("Region did change");
_appd.labelCurrent.Text = "Map Center "
+ mapView.CenterCoordinate.Latitude + ", "
+ mapView.CenterCoordinate.Longitude;
}
///
/// Seems to work in the Simulator now
///
public override MKAnnotationView GetViewForAnnotation
(MKMapView mapView, NSObject annotation)
{
var anv = mapView.DequeueReusableAnnotation("thislocation");
if (anv == null)
{
Console.WriteLine("creating new MKAnnotationView");
anv = new MKPinAnnotationView(annotation, "thislocation");
}
else
{
anv.Annotation = annotation;
}
anv.AnimatesDrop = true;
anv.PinColor = MKPinAnnotationColor.Green;
anv.CanShowCallout = true;
return anv;
}
}
This Stack Trace (below) is what you'll see in MonoDevelop when using the Simulator - upload to the device to get it working (or if you are using the trial version, you may have to wait for an update to MonoTouch). UPDATE:fixed in MonoTouch 1.1
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0x00004>
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr)
at MonoTouch.UIKit.UIApplication.Main (string[],string,string)
at MonoTouch.UIKit.UIApplication.Main (string[])
at MapKit01.Application.Main (string[])
at (wrapper runtime-invoke).runtime_invoke_void_object (object,intptr,intptr,intptr)
Native stacktrace:
0 MapKit01 0x00092d1a mono_handle_native_sigsegv + 266
1 MapKit01 0x00006f3a mono_sigsegv_signal_handler + 298
2 libSystem.B.dylib 0x90b25b9b _sigtramp + 43
3 ??? 0xffffffff 0x0 + 4294967295
Debug info from gdb:
warning: Trying to remove a section from the ordered section list that did not exist at 0x2d4000.
