Wie links oben und rechts unten Breite und Länge von Karte in MapKit zu bekommen? Ich benutze diesen Code, aber es funktioniert nicht richtig. Wie soll ich es beheben?
MKCoordinateRegion region = [map region];
double topL,topG,bottomL,bottomG;
//if latitude=55 and latitudeDelta=126 topL is 118 and it will be not at top, it will be at buttom of screen
topL = region.center.latitude + region.span.latitudeDelta/2;
topG = region.center.longitude - region.span.longitudeDelta/2;
CLLocationCoordinate2D lt;
lt.latitude=topL;
lt.longitude=topG;
annotation = [Annotation new];
annotation.coordinate = lt;
annotation.title = @Left;
[map addAnnotation:annotation];
[annotation release];
//if latitude=55 and latitudeDelta=126 bottomL is -7.23 and it will be not at bottom, it will be at above bottom of screen
bottomL = region.center.latitude - region.span.latitudeDelta/2;
bottomG = region.center.longitude + region.span.longitudeDelta/2;
CLLocationCoordinate2D rb;
rb.latitude=bottomL;
rb.longitude=bottomG;
annotation = [Annotation new];
annotation.coordinate = rb;
annotation.title = @Right;
[map addAnnotation:annotation];
[annotation release];













