[Mono-bugs] [Bug 686788] New: MKMapView with a MKAnnotation crashes when pin is dragged then dropped (MonoTouch 4)

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Mon Apr 11 22:59:57 EDT 2011



           Summary: MKMapView with a MKAnnotation crashes when pin is
                    dragged then dropped (MonoTouch 4)
    Classification: Mono
           Product: MonoTouch
           Version: unspecified
          Platform: All
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Class Libraries
        AssignedTo: gnorton at novell.com
        ReportedBy: andrewdyoung at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; en-US)
AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.204 Safari/534.16

MKMapView with a MKAnnotation crashes when pin is dragged then dropped. Crash
results in an exception being thrown.

Failed to find selector _original_setCoordinate: on
  at MonoTouch.ObjCRuntime.Runtime.GetMethod (IntPtr klass, IntPtr selptr)
[0x0001c] in /Users/plasma/Source/iphone/monotouch/ObjCRuntime/Runtime.cs:111 
  at (wrapper native-to-managed) MonoTouch.ObjCRuntime.Runtime:GetMethod
  at (wrapper managed-to-native)
MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String
principalClassName, System.String delegateClassName) [0x00038] in
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args) [0x00000] in
  at Saambaa.iPhone.Application.Main (System.String[] args) [0x00000] in

Reproducible: Always

Steps to Reproduce:
1. Add an MKMapView onto a ViewController
2. Add a MKAnnotation with a corresponding MKAnnotationView of type
MKPinAnnotationView set to draggable.
3. Run the app, drag and drop the pin in a different location.
4. See exception report as described in the details.
Actual Results:  
Exception is thrown as described in the details.

Expected Results:  
Coordinate should be set on the annotation object.

In order to work around this issue, I had to manually bind (Export) the
setCoordinate method with the following code in my class that inherits from

private CLLocationCoordinate2D _coord;

public void SetCoordinate(CLLocationCoordinate2D coord)
   _coord = coord;

Looks like this binding is missing in MonoTouch 4. Overriding the Coordinate
property did not fix the problem. The following did not work. Neither did using
the non-shorthand version of overriding the property.

public override CLLocationCoordinate2D Coordinate { get; set; }

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