Set a location to the Map in a business info page - ios

Question

I'm designing an app for a restaurant (and also, mostly to practice with iOS dev).
For this restaurant info page (address, phone #, etc) I added a smaller Map on the bottom page to display the place where the restaurant is but:
how can I make this small map to display the restaurant location (I know the coordinates) and
how to code that if the user click on the map, it switches to Apple Map app with the same coordinates.
Thank you

Answer 1

You have to use the MKMapViewDelegate in your viewcontroller.h file and use the ma delegate's methods to handle the map.
Try with the code below to add the pin of the restaurant and center the map on it.
MKAnnotationView *point = [[MKAnnotationView alloc] initWithAnnotation:_station reuseIdentifier:#"restaurant"];
[map addAnnotation:point.annotation];
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta = 0.002;
span.longitudeDelta = 0.002;
region.span = span;
region.center = location.coordinate;
[map setRegion:region animated:YES];
After that, implement the didSelectAnnotationView method to recognize the pin pressed. In it you can open the Apple Map with on the restaurant's coordinates:
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
NSString *title = #"title";
float latitude = ...;
float longitude = ...;
int zoom = 13;
NSString *stringURL = [NSString stringWithFormat:#"http://maps.apple.com?q=%##%1.6f,%1.6f&z=%d", title, latitude, longitude, zoom];
NSURL *url = [NSURL URLWithString:stringURL];
[[UIApplication sharedApplication] openURL:url];
}
EDIT:
I'm working to an application similar to your, but in my case is about station.
MDStationController is the controller of the view that contains the map on the top (like yours). MDStation is the station.
// MDStationController.h
#import <UIKit/UIKit.h>
#import "MDStation.h"
#import <MapKit/MapKit.h>
#interface MDStationController : UIViewController <MKMapViewDelegate>
#property (nonatomic, retain) MDStation* station;
#end
// MDStationController.m
#implementation MDStationController
#synthesize station=_station;
[...]
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.title = _station.name;
stationView.map.delegate = self;
[self addAndcenterMapOnLocation:_station.location];
}
- (void) addAndcenterMapOnLocation:(CLLocation*)location {
MKAnnotationView *point = [[MKAnnotationView alloc] initWithAnnotation:_station reuseIdentifier:#"station"];
[stationView.map addAnnotation:point.annotation];
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta = 0.002;
span.longitudeDelta = 0.002;
region.span = span;
region.center = location.coordinate;
[stationView.map setRegion:region animated:YES];
}
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
static NSString *defaultID = #"station";
MKAnnotationView *pinView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultID];
pinView.image = [UIImage imageNamed:#"bike_gray"];
return pinView;
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
NSString *title = _station.name;
float latitude = _station.location.latitude;
float longitude = _station.location.longitude;
int zoom = 13;
NSString *stringURL = [NSString stringWithFormat:#"http://maps.apple.com?q=%##%1.6f,%1.6f&z=%d", title, latitude, longitude, zoom];
NSURL *url = [NSURL URLWithString:stringURL];
[[UIApplication sharedApplication] openURL:url];
}