mkcoordinatespan - Developer IT

MKCoordinateRegion and MKCoordinateSpan in MapKit Framework

- by Biranchi

Hi all, How to zoom out the map using MKCoordinateRegion and MKCoordinateSpan , so that it is always displayed in the center of the screen ? Thanks

iPhone dev - showing two locations on the map

Now I have the coordinate of two locations, let say locationA with latitude 40 and longitude -80, locationB with latitude 30 and longitude -70, I want to create a mapView that I can see both locations with appropriate viewing distance. I got the new coordinate by finding the midpoint (in this example, {35, -75}), but the question is, How can I get an appropriate viewing distance? In particular, how can I calculate CLLocationDistance (if I'm using MKCoordinateRegionMakeWithDistance) or MKCoordinateSpan (if I'm using MKCoordinateSpanMake). Thanks in advance.

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iPhone MKMapView : the map can’t load completely.

- by Tattat

I don't know what's make wrong, my map can load, but the image on the map is not completely load. plx help. thz a lot. Here is the simulate map from the iPhone: (Added more example image.) http://img689.imageshack.us/img689/8476/screenshot20100309at841.jpg Here is the code: MKCoordinateRegion theRegion; MKCoordinateSpan theSpan; theSpan.latitudeDelta = 0.005; theSpan.longitudeDelta = 0.005; theRegion.center = manager.location.coordinate; theRegion.span = theSpan; myMap.scrollEnabled = YES; myMap.zoomEnabled = YES; [myMap setRegion:theRegion]; [myMap regionThatFits:theRegion];

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MkMapView Zoom Level

- by meetS

I m using MkMapView with google maps.I succeed to show map view and address with annotation pin.But I want increased zoom level.How Can I Set it programmatically?? (void) showMyAddress { //Hide the keypad MKCoordinateRegion region; MKCoordinateSpan span; span.latitudeDelta=0.2; span.longitudeDelta=0.2; CLLocationCoordinate2D location = [self addressLocation]; region.span=span; region.center=location; if(addAnnotation != nil) { [mapView removeAnnotation:addAnnotation]; [addAnnotation release]; addAnnotation = nil; } addAnnotation = [[AddAnnotation alloc] initWithCoordinate:location ]; [addAnnotation setMTitle:@"abc"]; [addAnnotation setMSubTitle:@"def."] [mapView addAnnotation:addAnnotation]; [mapView setRegion:region animated:TRUE]; [mapView regionThatFits:region]; } -(CLLocationCoordinate2D) addressLocation { NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", [@"abc" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString] encoding:NSStringEncodingConversionAllowLossy error:nil]; NSArray *listItems = [locationString componentsSeparatedByString:@","]; double latitude = 0.0; double longitude = 0.0; if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) { latitude = [[listItems objectAtIndex:2] doubleValue]; longitude = [[listItems objectAtIndex:3] doubleValue]; } else { } CLLocationCoordinate2D location; location.latitude = latitude; location.longitude = longitude; return location; }

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iPhone SDK: How to center map around a particular point?

- by buzzappsoftware

New to MapKit. Having problems centering map around a specified point. Here is the code. Not sure why this is not working. We are expecting to see a map centered around Cincinnati, OH. What we are seeing is the default google map of the world. Any help appreciated. / Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; CLLocationCoordinate2D mapCoords[2]; mapCoords[0].latitude = 39.144057; mapCoords[0].latitude = -84.505484; mapCoords[1].latitude = 39.142984; mapCoords[1].latitude = -84.502534; MKCoordinateSpan span; span.latitudeDelta = 0.2; span.longitudeDelta = 0.2; MKCoordinateRegion region; region.center = mapCoords[0]; region.span = span; [mapView setRegion:region animated:YES]; }

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An offscreen MKMapView behaves differently in 3.2, 4.0

- by Duane Fields

In 3.1 I've been using an "offscreen" MKMapView to create map images that I can rotate, crop and so forth before presenting them the user. In 3.2 and 4.0 this technique no longer works quite right. Here's some code that illustrates the problem, followed by my theory. // create map view _mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, MAP_FRAME_SIZE, MAP_FRAME_SIZE)]; _mapView.zoomEnabled = NO; _mapView.scrollEnabled = NO; _mapView.delegate = self; _mapView.mapType = MKMapTypeSatellite; // zoom in to something enough to fill the screen MKCoordinateRegion region; CLLocationCoordinate2D center = {30.267222, -97.763889}; region.center = center; MKCoordinateSpan span = {0.1, 0.1 }; region.span = span; _mapView.region = region; // set scrollview content size to full the imageView _scrollView.contentSize = _imageView.frame.size; // force it to load #ifndef __IPHONE_3_2 // in 3.1 we can render to an offscreen context to force a load UIGraphicsBeginImageContext(_mapView.frame.size); [_mapView.layer renderInContext:UIGraphicsGetCurrentContext()]; UIGraphicsEndImageContext(); #else // in 3.2 and above, the renderInContext trick doesn't work... // this at least causes the map to render, but it's clipped to what appears to be // the viewPort size, plus some padding [self.view addSubview:_mapView]; #endif when the map is done loading, I snap picture of it and stuff it in my scrollview - (void)mapViewDidFinishLoadingMap:(MKMapView *)mapView { NSLog(@"[MapBuilder] mapViewDidFinishLoadingMap"); // render the map to a UIImage UIGraphicsBeginImageContext(mapView.bounds.size); // the first sub layer is just the map, the second is the google layer, this sublayer structure might change of course [[[mapView.layer sublayers] objectAtIndex:0] renderInContext:UIGraphicsGetCurrentContext()]; // we are done with the mapView at this point, we need its ram! _mapView.delegate = nil; [_mapView release]; [_mapView removeFromSuperview]; _mapView = nil; UIImage* mapImage = [UIGraphicsGetImageFromCurrentImageContext() retain]; UIGraphicsEndImageContext(); _imageView.image = mapImage; [mapImage release], mapImage = nil; } The first problem is that in 3.1 rendering to a context would trigger the map to begin loading. This no longer works in 3.2, 4.0. The only thing I have found would trigger the load is to temporarily add the map to the view (i.e. make it visible). The problem being that the map only renders to the visible area of the screen, plus a little padding. The frame/bounds are fine, but it appears to be "helpfully" optimizes the loading to limit the tiles to those visible on the screen or close to it. Any ideas how to force the map to load at full size? Anyone else have this issue?

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MKMapView memory usage grows out of control with setRegion: calls

- by Kurt

Hi, I have a single MKMapView instance that I have programmatically added to a UIView. As part of the UI, the user can cycle through a list of addresses and the map view is updated to show the correct map for each address as the user goes through them. I create the map view once, and simply change what it displays with setRegion:animated:. The problem is that each time the map is changed to show a new address, the memory usage of my program increases by 200K-500K (as reported by Memory Monitor in Instruments). According to Object Allocations, it appears that a lot of 1.0K Mallocs are happening each time, and the Extended Detail pane for these 1.0K allocations shows that the Responsible Caller is convert_image_data and the Extended Detail pane shows that this is the result of [MKMapTileView drawLayer:inContext:]. So, seems likely to me that the memory usage is due to MKMapView not freeing memory it uses to redraw the map each time. In fact, when I don't display the map at all (by not even adding it as a subview of my main UIView) but still cycle through the addresses (which changes various UILabels and other displayed info) the memory usage for the app does NOT increase. If I add the map view but never update it with setRegion:, the memory also does NOT increase when changing to a new address. One more bit of info: if I go to a new address (and therefore ask the map to display the new address) the memory jumps as described above. However, if I go back to an address that was already displayed, the memory does not jump when the map redraws with the old address. Also, this happens on iPad (real device) with 3.2 and on iPhone (again, real device) with 3.1.2. Here's how I initialize the MKMapView (I only do this once): CGRect mapFrame; mapFrame.origin.y = 460; // yes, magic numbers. just for testing. mapFrame.origin.x = 0; mapFrame.size.height = 500; mapFrame.size.width = 768; mapView = [[MKMapView alloc] initWithFrame:mapFrame]; mapView.delegate = self; [self.view insertSubview:mapView atIndex:0]; And in response to the user selecting an address, I set the map like so: MKCoordinateRegion region; MKCoordinateSpan span; span.latitudeDelta=kStreetMapSpan; // 0.003 span.longitudeDelta=kStreetMapSpan; // 0.003 region.center = address.coords; // coords is CLLocationCoordinate2D region.span = span; mapView.region.span = span; [mapView setRegion:region animated:NO]; Any thoughts? I've scoured the net but haven't seen mention of this problem, and I've reached the limits of my Instruments knowledge. Thanks for any ideas.

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Storing an subtitle on an annotation with NSUserDefualts

- by Krismutt

Hey everybody! Basically: what i try to do is to save the street address of an annotation so that when I quit the application and launch it again the street address still will be there...see the following code: SavePosition.m -(NSString *)subtitle{ if (!subtitle) { return @"Ingen gata i närheten"; } else { return subtitle; } } -(NSString *)title{ return @"Sparad Position"; } -(id)initWithCoordinate:(CLLocationCoordinate2D) coor{ self.coordinate=coor; NSLog(@"%f,%f",coor.latitude,coor.longitude); return self; } - (void)setCoordinate:(CLLocationCoordinate2D)koor { MKReverseGeocoder *geocoder = [[[MKReverseGeocoder alloc] initWithCoordinate:koor] autorelease]; geocoder.delegate = self; coordinate = koor; [geocoder start]; } - (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error { NSLog(@"fail %@", error); } - (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark { self.subtitle = [placemark.addressDictionary valueForKey:@"Street"]; } -(void)applicationWillTerminate:(UIApplication *)application { NSUserDefaults *userDef = [NSUserDefaults standardUserDefaults]; [userDef setValue:subtitle forKey:@"SavedAddress"]; [userDef setBool:YES forKey:@"Street"]; [userDef synchronize]; } @end mainViewController.m -(void)viewDidLoad { [super viewDidLoad]; NSUserDefaults *userDef = [NSUserDefaults standardUserDefaults]; if ([userDef boolForKey:@"sparadKoordinat-existerar"]) { CLLocationCoordinate2D savedCoordinate; savedCoordinate.latitude = [userDef doubleForKey:@"sparadKoordinat-latitud"]; savedCoordinate.longitude = [userDef doubleForKey:@"sparadKoordinat-longitud"]; SparaPosition *position=[[SparaPosition alloc] initWithCoordinate:savedCoordinate]; [mapView addAnnotation:position]; savedPosition = savedCoordinate; raderaSparad.enabled=YES; skickaMaps.enabled=YES; mStoreLocationButton.enabled=NO; friZoom = NO; NSString *savedAddress = [[NSUserDefaults standardUserDefaults] objectForKey:@"SavedAddress"]; if (savedAddress) { savedAddress.subtitle = [userDef valueForKey:@"Street"]; // what code should I add here? } MKCoordinateRegion region; region.center.latitude = savedCoordinate.latitude; region.center.longitude= savedCoordinate.longitude; MKCoordinateSpan span; span.latitudeDelta = 0.01; span.longitudeDelta = 0.01; region.span = span; region = [mapView regionThatFits:region]; [mapView setRegion:region animated:YES]; [mapView setRegion:region animated:TRUE]; }

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Zooming out to fit all annotations in MapKit

- by Krismutt

Hey everybody!! I wanna zoom out so that all my annotations(my location and one more annotation) fit to the screen...what do I do wrong?? I get the following warning: "'getDistanceFrom:' is deprecated".... -(void)viewDidLoad { [super viewDidLoad]; mapView = [[MKMapView alloc] initWithFrame:self.view.bounds]; mapView.showsUserLocation = TRUE; mapView.delegate = self; mapView.mapType = MKMapTypeStandard; mapView.zoomEnabled = YES; mapView.scrollEnabled = YES; mapView.userInteractionEnabled = YES; [mapView.userLocation setTitle:@"Nuvarande plats"]; [mapView.userLocation setSubtitle:@"Du är här"]; [self.view insertSubview:mapView atIndex:0]; self.locationManager = [[[CLLocationManager alloc] init] autorelease]; locationManager.delegate = self; locationManager.desiredAccuracy = kCLLocationAccuracyBest; [locationManager startUpdatingLocation]; [mapView release]; } -(void) locationManager: (CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{ NSLog (@"Position uppdateras" ); location = newLocation.coordinate; if (friZoom) { MKCoordinateRegion region; region.center.latitude = location.latitude; region.center.longitude= location.longitude; MKCoordinateSpan span; span.latitudeDelta = 0.01; span.longitudeDelta = 0.01; region.span = span; [mapView setRegion:region animated:TRUE];} } - (MKAnnotationView *)mapView:(MKMapView *)mapview viewForAnnotation:(id <MKAnnotation>)knappnal { if ([knappnal isKindOfClass:MKUserLocation.class]) { return nil; } MKPinAnnotationView *knappnalView = (MKPinAnnotationView*)[mapview dequeueReusableAnnotationViewWithIdentifier:@"annot"]; if (!knappnalView) { knappnalView = [[[MKPinAnnotationView alloc] initWithAnnotation:knappnal reuseIdentifier:@"annot"] autorelease]; knappnalView.pinColor = MKPinAnnotationColorRed; knappnalView.animatesDrop = YES; knappnalView.canShowCallout = YES; } else { knappnalView.annotation = knappnal; } return knappnalView; } - (IBAction)storeLocationInfo:(id) sender{ SparaPosition *position=[[SparaPosition alloc] initWithCoordinate:location]; [mapView addAnnotation:position]; savedPosition = location; } - (IBAction)visaPosition:(id)sender{ CLLocationCoordinate2D southWest =location; CLLocationCoordinate2D northEast =savedPosition; southWest.latitude = MIN(southWest.latitude, location.latitude); southWest.longitude = MIN(southWest.longitude, location.longitude); northEast.latitude = MAX(northEast.latitude, savedPosition.latitude); northEast.longitude = MAX(northEast.longitude, savedPosition.longitude); CLLocation *locSouthWest = [[CLLocation alloc] initWithLatitude:southWest.latitude longitude:southWest.longitude]; CLLocation *locNorthEast = [[CLLocation alloc] initWithLatitude:northEast.latitude longitude:northEast.longitude]; CLLocationDistance meters = [locSouthWest getDistanceFrom:locNorthEast]; MKCoordinateRegion region; region.center.latitude = (southWest.latitude + northEast.latitude) / 2.0; region.center.longitude = (southWest.longitude + northEast.longitude) / 2.0; region.span.latitudeDelta = meters / 111319.5; region.span.longitudeDelta = 0.0; region = [mapView regionThatFits:region]; [mapView setRegion:region animated:YES]; [locSouthWest release]; [locNorthEast release]; } Would really appreciate an answer!

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