I'm trying to set the map region (center and span) so that the map shows all pin-annotations at the same time.
I'm having trouble converting the long/lat coordinates from NSString to double, resp. make calculations with them. Here is the code I'm using:
- (void)updateMemberPins{
//calculate new region to show on map
double center_long = 0.0f;
double center_lat = 0.0f;
double max_long = 0.0f;
double min_long = 0.0f;
double max_lat = 0.0f;
double min_lat = 0.0f;
for (Member *member in members) {
//find min and max values
if ([member.locLat doubleValue] > max_lat) {max_lat = [member.locLat doubleValue];}
if ([member.locLat doubleValue] < min_lat) {min_lat = [member.locLat doubleValue];}
if ([member.locLong doubleValue] > max_long) {max_long = [member.locLong doubleValue];}
if ([member.locLong doubleValue] < min_long) {min_long = [member.locLong doubleValue];}
//sum up long and lang to get average later
center_lat = center_lat + [member.locLat doubleValue];
center_long = center_long + [member.locLong doubleValue];
}
//calculate average long / lat
center_lat = center_lat / [members count];
center_long = center_long / [members count];
NSLog(@"center long: %d, center lat: %d", center_long, center_lat);
NSLog(@"max_long: %d, min_long: %d, max_lat: %d, min_lat: %d", max_long, min_long, max_lat, min_lat);
//create new region and set map
CLLocationCoordinate2D coord = {latitude: center_lat, longitude: center_long};
MKCoordinateSpan span = MKCoordinateSpanMake(abs(max_lat) + abs(min_lat), abs(max_long) + abs(min_long));
MKCoordinateRegion region = {coord, span};
[resultMapView setRegion:region];
//remove all pins from map
[resultMapView removeAnnotations:resultMapView.annotations];
//show member pins
for (id member in members) {
[resultMapView addAnnotation:(Member *) member];
}
}
The result of the log-output is:
center long: -1946827116, center lat: 1075651472
max_long: -6267216, min_long: 1076018553, max_lat: 0, min_lat: 0
I think the problem comes from (wrongly) converting values from NSString to double, however I cannot find a way to make it work... The format of the location-strings is like '43.5686473'.
Any hints? Cheerz