MapKit: Comment puis-je effectuer un panoramique et un zoom pour ajuster toutes mes annotations?

Question

J'ai donc un tas d'annotations étalées sur ma carte ... tout est juste dandy. Maintenant, je dois être en mesure de définir la position et le zoom de la carte afin qu'ils s'adaptent parfaitement. Comment puis-je faire ceci?

Answer 1

Des forums d'Apple ...

- (void)recenterMap { 

     NSArray *coordinates = [self.mapView valueForKeyPath:@"annotations.coordinate"]; 



     CLLocationCoordinate2D maxCoord = {-90.0f, -180.0f}; 

     CLLocationCoordinate2D minCoord = {90.0f, 180.0f}; 



     for(NSValue *value in coordinates) { 

       CLLocationCoordinate2D coord = {0.0f, 0.0f}; 

       [value getValue:&coord]; 

       if(coord.longitude > maxCoord.longitude) { 

        maxCoord.longitude = coord.longitude; 

       } 

       if(coord.latitude > maxCoord.latitude) { 

        maxCoord.latitude = coord.latitude; 

       } 

       if(coord.longitude < minCoord.longitude) { 

        minCoord.longitude = coord.longitude; 

       } 

       if(coord.latitude < minCoord.latitude) { 

        minCoord.latitude = coord.latitude; 

       } 

     } 

     MKCoordinateRegion region = {{0.0f, 0.0f}, {0.0f, 0.0f}}; 

     region.center.longitude = (minCoord.longitude + maxCoord.longitude)/2.0; 

     region.center.latitude = (minCoord.latitude + maxCoord.latitude)/2.0; 

     region.span.longitudeDelta = maxCoord.longitude - minCoord.longitude; 

     region.span.latitudeDelta = maxCoord.latitude - minCoord.latitude; 

     [self.mapView setRegion:region animated:YES]; 

    } 

Answer 2

@interface MKMapView (zoomToFit) 

- (void)zoomToFitOverlays; //Animation defaults to YES 
- (void)zoomToFitOverlay:(id<MKOverlay>)anOverlay; 
- (void)zoomToFitOverlays:(NSArray *)someOverlays; 

- (void)zoomToFitOverlaysAnimated:(BOOL)animated; 
- (void)zoomToFitOverlay:(id<MKOverlay>)anOverlay animated:(BOOL)animated; 
- (void)zoomToFitOverlays:(NSArray *)someOverlays animated:(BOOL)animated; 

- (void)zoomToFitOverlays:(NSArray *)someOverlays animated:(BOOL)animated insetProportion:(CGFloat)insetProportion; //inset 0->1, defaults in other methods to .1 (10%) 

@end 

@implementation MKMapView (zoomToFit) 


#pragma mark - 
#pragma mark Zoom to Fit 

- (void)zoomToFitOverlays { 
    [self zoomToFitOverlaysAnimated:YES]; 
} 

- (void)zoomToFitOverlay:(id<MKOverlay>)anOverlay { 
    [self zoomToFitOverlay:[NSArray arrayWithObject:anOverlay] animated:YES]; 
} 

- (void)zoomToFitOverlays:(NSArray *)someOverlays { 
    [self zoomToFitOverlays:someOverlays animated:YES]; 
} 

- (void)zoomToFitOverlaysAnimated:(BOOL)animated { 
    [self zoomToFitOverlays:self.overlays animated:animated]; 
} 

- (void)zoomToFitOverlay:(id<MKOverlay>)anOverlay animated:(BOOL)animated { 
    [self zoomToFitOverlays:[NSArray arrayWithObject:anOverlay] animated:YES]; 
} 

- (void)zoomToFitOverlays:(NSArray *)someOverlays animated:(BOOL)animated { 
    [self zoomToFitOverlays:someOverlays animated:animated insetProportion:.1]; 
} 

- (void)zoomToFitOverlays:(NSArray *)someOverlays animated:(BOOL)animated insetProportion:(CGFloat)insetProportion { 
    //Check 
    if (!someOverlays || !someOverlays.count) { 
     return; 
    } 

    //Union 
    MKMapRect mapRect = MKMapRectNull; 
    if (someOverlays.count == 1) { 
     mapRect = ((id<MKOverlay>)someOverlays.lastObject).boundingMapRect; 
    } else { 
     for (id<MKOverlay> anOverlay in someOverlays) { 
      mapRect = MKMapRectUnion(mapRect, anOverlay.boundingMapRect); 
     } 
    } 

    //Inset 
    CGFloat inset = (CGFloat)(mapRect.size.width*insetProportion); 
    mapRect = [self mapRectThatFits:MKMapRectInset(mapRect, inset, inset)]; 

    //Set 
    MKCoordinateRegion region = MKCoordinateRegionForMapRect(mapRect); 
    [self setRegion:region animated:animated]; 
} 

@end