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copied!<p>Following code is use for the zooming par as the distance of the pin.</p> <pre><code>-(void) centerMap { MKCoordinateRegion region; CLLocationDegrees maxLat = -90; CLLocationDegrees maxLon = -180; CLLocationDegrees minLat = 120; CLLocationDegrees minLon = 150; NSArray *temp=self.AS; // NSArray *temp=[NSArray arrayWithArray:[NSArray arrayWithArray:[reports objectAtIndex:0]]]; for (int i=0; i<[temp count];i++) { Place* home = [[[Place alloc] init] autorelease]; home.latitude = [[[temp objectAtIndex:i] valueForKey:@"latitude"]floatValue]; home.longitude =[[[temp objectAtIndex:i] valueForKey:@"longitude"]floatValue]; PlaceMark* from = [[[PlaceMark alloc] initWithPlace:home] autorelease]; CLLocation* currentLocation = (CLLocation*)from ; if(currentLocation.coordinate.latitude > maxLat) maxLat = currentLocation.coordinate.latitude; if(currentLocation.coordinate.latitude < minLat) minLat = currentLocation.coordinate.latitude; if(currentLocation.coordinate.longitude > maxLon) maxLon = currentLocation.coordinate.longitude; if(currentLocation.coordinate.longitude < minLon) minLon = currentLocation.coordinate.longitude; region.center.latitude = (maxLat + minLat) / 2; region.center.longitude = (maxLon + minLon) / 2; region.span.latitudeDelta = maxLat - minLat; region.span.longitudeDelta = maxLon - minLon; } [mapView setRegion:region animated:YES]; } - (MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation { if (annotation == mapView.userLocation) return nil; MKPinAnnotationView *pin = (MKPinAnnotationView *) [mapView dequeueReusableAnnotationViewWithIdentifier: @"asdf"]; if (pin == nil) pin = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier: @"asdf"] autorelease]; else pin.annotation = annotation; pin.userInteractionEnabled = YES; UIButton *disclosureButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; [disclosureButton setFrame:CGRectMake(0, 0, 30, 30)]; pin.rightCalloutAccessoryView = disclosureButton; pin.pinColor = MKPinAnnotationColorRed; //pin.animatesDrop = YES; [pin setEnabled:YES]; [pin setCanShowCallout:YES]; return pin; } </code></pre> <p>This code may help to create new application,</p>

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