Centering Annotations in mkmapview and objective-c

mapcenter.txt

#define MAP_PADDING 2.5
#define MINIMUM_VISIBLE_LATITUDE 0.01
- (void)zoomToAnnotations:(NSArray*)annotationArray{
    
    if (annotationArray.count>0) {
        
        CGFloat maxLongitude = -180;
        CGFloat maxLatitude = -90;
        CGFloat minLongitude = 180;
        CGFloat minLatitude = 90;
        
        for(StationAnnotation* annotation in annotationArray){
            CGFloat lat = annotation.coordinate.latitude;
            CGFloat lon = annotation.coordinate.longitude;
            NSLog(@"lat: %f, lon: %f",lat,lon);
            if (maxLatitude<lat) {
                maxLatitude = lat;
            }
            if(lat<minLatitude){
                minLatitude = lat;
            }
            if(maxLongitude<lon){
                maxLongitude = lon;
            }
            if (lon<minLongitude) {
                minLongitude = lon;
            }
        }
        
        NSLog(@"maxLat: %f minLat: %f maxLon: %f minLon: %f",maxLatitude,minLatitude,maxLongitude,minLongitude);
        if (maxLatitude>90) {
            NSLog(@"maxLat  %f",maxLatitude);
            maxLatitude = 90;
        }
        if(minLatitude<-90){
            NSLog(@"minLat  %f",minLatitude);
            minLatitude = -90;
        }
        if(minLongitude<-180){
            NSLog(@"minLon  %f",maxLongitude);
            minLongitude = -180;
        }
        if(maxLongitude>180){
            NSLog(@"minLon  %f",minLongitude);
            maxLongitude = 180;
        }
        
        MKCoordinateRegion region;
        region.center.latitude = (minLatitude + maxLatitude) / 2;
        region.center.longitude = (minLongitude + maxLongitude) / 2;
        
        region.span.latitudeDelta = (maxLatitude - minLatitude) * MAP_PADDING;
        
        region.span.latitudeDelta = (region.span.latitudeDelta < MINIMUM_VISIBLE_LATITUDE)
        ? MINIMUM_VISIBLE_LATITUDE
        : region.span.latitudeDelta;
        
        region.span.longitudeDelta = (maxLongitude - minLongitude) * MAP_PADDING;
        
        MKCoordinateRegion scaledRegion = [self.mapView regionThatFits:region];
        
        @try {
            [self.mapView setRegion:scaledRegion animated:YES];
        } @catch (NSException *exception) {
            NSLog(@"Exception: %@",exception);
        } @finally {
            
        }
        
    }
}