iOS API 2.1 envelope to visibleArea deprication

Question

The iOS API 2.1 says:

"The envelope property on AGSMapView has been deprecated and replaced by visibleArea to take into account map rotation."

When I change to :

AGSEnvelope *env = self.mapView.visibleArea;

I get this error:

Incompatible pointer types initializing 'AGSEnvelope *' with an expression of type 'AGSPolygon *'

Nimesh : Your answer was

The visibleArea returns AGSPolygon and you are trying to save it as AGSEnvelope. Hence the error. If you want envelope then change code line as following,

AGSEnvelope *env = self.mapView.visibleArea.envelope;

I tried this, and now I get an EXC Bad Access error on the zoom to envelope call.

I do this:
    AGSEnvelope *env = self.mapView.visibleArea.envelope;
then this:

// remove all layers from the mapView
    
    [self.mapView reset];

// add the layers back in with the correct order
    if (_currentTMS.loaded == YES){
        [self.mapView addMapLayer:_currentTMS withName:@tiledLayer];
    }
    [self.mapView addMapLayer:baseLayer withName:@baseLayer];
    [self.mapView addMapLayer:_currentFMS withName:@featureLayer];
    [self.mapView addMapLayer:_currentGL withName:@Parcel Outline Graphics Layer];
    [self.mapView zoomToEnvelope:env animated:NO];

the error is onthe zoomToEnvelope.

This all worked fine when it was just AGSEnvelope *env = self.mapView.envelope;

Any suggestions?

DarrenMackiewicz · Answer

Thanks Nimesh !
That helps big time!
Problem solved

NimeshJarecha · Answer

Hi Darren,1) I'm grabbing the envelope before I use the mapView.refresh (so that I have it before the mapview gets reset)

When you do "AGSEnvelope *env = self.mapView.visibleArea.envelope" means env is nothing but a reference pointer to the self.mapView.visibleArea.envelope. So, if visibleArea.envelope is gone means env gone too.

You can do this..

AGSEnvelope *env = [[self.mapView.visibleArea.envelope copy] autorelease];2) This worked in the iOS 4.2 and 4.3 API just fine.

It worked doesn't mean it was right. It's a timing thing, by the time you reach to a zoom function and base layer is loaded and mapView's envelope is available for the zoom function then it works otherwise EXE Bad Access.

Hope this helps!

Regards,
Nimesh

DarrenMackiewicz · Answer

Hi Nimesh

2 things.  
1) I'm grabbing the envelope before I use the mapView.refresh (so that I have it before the mapview gets reset)
2) This worked in the iOS 4.2 and 4.3 API just fine.  No other code changed.  But, now, when I change

AGSEnvelope *env = self.mapView.envelope 
to
AGSEnvelope *env = self.mapView.visibleArea.envelope
it now throws the error.