调用iPhone地图显示指定的点

来自文档demo

// open the earthquake info in Maps

            // create a map region pointing to the earthquake location

           CLLocationCoordinate2D location = (CLLocationCoordinate2D) { earthquake.latitude, earthquake.longitude };

           NSValue *locationValue = [NSValuevalueWithMKCoordinate:location];

            MKCoordinateSpan span = (MKCoordinateSpan) {2.0, 2.0 };

           NSValue *spanValue = [NSValuevalueWithMKCoordinateSpan:span];

            NSDictionary *launchOptions =@{ MKLaunchOptionsMapTypeKey :@(MKMapTypeStandard),

                                           MKLaunchOptionsMapCenterKey : locationValue,

                                           MKLaunchOptionsMapSpanKey : spanValue,

                                           MKLaunchOptionsShowsTrafficKey : @(NO),

                                            MKLaunchOptionsDirectionsModeDriving : @(NO)};

            // make sure the map item has a pin placed on it with the title as the earthquake location

           MKPlacemark *placemark = [[MKPlacemarkalloc] initWithCoordinate:location

                                                          addressDictionary:nil];

           MKMapItem *mapItem = [[MKMapItemalloc] initWithPlacemark:placemark];

            [mapItemsetName:earthquake.location];

            [mapItemopenInMapsWithLaunchOptions:launchOptions];