Selector element does not have valid object type (Cocoa touch)

Question

Hi

I'm trying to iterate over a collection of objects and create an annotation for each object as seen in this code, but at the closing } of the for loop i get this error Selector element does not have valid object type. What does this mean?

    for (POI myPOI in appDelegate.pois){
     CLLocationCoordinate2D location;
     location.latitude=[myPOI.lat doubleValue];
     location.longitude=[myPOI.lon doubleValue];
     region.span=span;
     region.center=location;

     LocationAnnotation *locAnn;

     locAnn = [[LocationAnnotation alloc] initWithCoordinate:location];
     [mapView addAnnotation:locAnn];
     [mapView setRegion:region animated:YES];

     [locAnn release];
    }

Also i get Variable sized object cannot be initialized at the beginning of the loop. And, instance variable lat (and lon too) is declared protected.

What have i done wrong?
Thanks

Answer 1

Is "POI" an object? If so, you're not declaring "myPOI" as a pointer to a POI. You'll want:

POI * myPOI ...

If POI is not an object, you can't use fast enumeration.