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POStore data in MKAnnotation?
 

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    <p>So I'm pretty new to Xcode and Objective-C. I have several ArtPiece objects with various attributes stored in an array. I then add them as MKAnnotations to the mapview. What I need to be able to do is send a reference to the array position they came from on click. I believe MKAnnotations only have the data members title, image, and location, so when I make an MKAnnotation from the objects, the annotation does not keep any of the other attributes. So, my question is, how can I manage to keep a reference to the array position of the object the annotation was created from so that I can send it to other methods so they can retrieve the additional information about the object from the array for detail views etc. Is there any way to store a single int value in an annotation? I don't think there is so any other ideas?</p> <p>Here is my ArtPiece.h:</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import &lt;MapKit/MapKit.h&gt; @interface ArtPiece : NSObject &lt;MKAnnotation&gt;{ NSString *title; NSString *artist; NSString *series; NSString *description; NSString *location; NSString *area; NSNumber *latitude; NSNumber *longitude; UIImage *image; } @property (nonatomic, retain) NSString *title; @property (nonatomic, retain) NSString *artist; @property (nonatomic, retain) NSString *series; @property (nonatomic, retain) NSString *description; @property (nonatomic, retain) NSString *location; @property (nonatomic, retain) NSString *area; @property (nonatomic, retain) NSNumber *latitude; @property (nonatomic, retain) NSNumber *longitude; @property (nonatomic, retain) UIImage *image; @end </code></pre> <p>and here is the .m:</p> <pre><code>#import "ArtPiece.h" #import "FindArtController.h" #import "ArtPiece.h" #import &lt;MapKit/MapKit.h&gt; @implementation ArtPiece - (NSString *)description{ return [NSString stringWithFormat:@"title: %@",title]; } @synthesize title, artist, series, description, latitude, longitude, location, area, image; - (CLLocationCoordinate2D)coordinate { CLLocationCoordinate2D theCoordinate; theCoordinate.latitude = [self.latitude doubleValue]; theCoordinate.longitude = [self.longitude doubleValue]; return theCoordinate; } @end </code></pre> <p>I then go on to make objects of that class, set their values, and add them to an array in the AppDelegate. Then, in another class, I use:</p> <pre><code>[self.mapView addAnnotations:mainDelegate.mapAnnotations]; </code></pre> <p>to add the annotations to the map. However, when I try to set the "artist" attribute in the viewforannotation method, I get "request for member artist in something not a structure or union." </p> <p>Obviously, I must be doing this subclassing thing wrong, but what do I change?</p> <p>Here is the viewforannotation method I have now. The test.artist... line is not working.</p> <pre><code>- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id &lt;MKAnnotation&gt;)annotation{ MKAnnotationView *test=[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"reuse"]; test.image = [UIImage imageNamed:@"pao_pin.png"]; [test setCanShowCallout:YES]; [test setUserInteractionEnabled:YES]; test.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; test.artist = annotation.artist; return test; } </code></pre> <p>So, should I: <code>annotation = (ArtPiece *)annotation</code> In short, my goal is to be able to store a reference to the array position of the object in this annotation was made from so that I can send that to other methods who can access that object for detail views etc. </p>
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