iOS - Accessing Maps

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Maps are always helpful for us to locate places. Maps are integrated in iOS using the MapKit framework.

Steps Involved

Step 1 − Create a simple view-based application.

Step 2 − Select your project file, then select targets and then add MapKit.framework.

Step 3 − We should also add Corelocation.framework.

Step 4 − Add a MapView to ViewController.xib and create an ibOutlet and name it as mapView.

Step 5 − Create a new file by selecting File → New → File... → select Objective C class and click next.

Step 6 − Name the class as MapAnnotation with "sub class of" as NSObject.

Step 7 − Select create.

Step 8 − Update MapAnnotation.h as follows −

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface MapAnnotation : NSObject<MKAnnotation>
@property (nonatomic, strong) NSString *title;
@property (nonatomic, readwrite) CLLocationCoordinate2D coordinate;

- (id)initWithTitle:(NSString *)title andCoordinate:
   (CLLocationCoordinate2D)coordinate2d;

@end

Step 9 − Update MapAnnotation.m as follows −

#import "MapAnnotation.h"

@implementation MapAnnotation
-(id)initWithTitle:(NSString *)title andCoordinate:
   (CLLocationCoordinate2D)coordinate2d {
  
   self.title = title;
   self.coordinate =coordinate2d;
   return self;
}
@end

Step 10 − Update ViewController.h as follows −

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>

@interface ViewController : UIViewController<MKMapViewDelegate> {
   MKMapView *mapView;
}
@end

Step 11 − Update ViewController.m as follows −

#import "ViewController.h"
#import "MapAnnotation.h"

@interface ViewController ()
@end

@implementation ViewController

- (void)viewDidLoad {
   [super viewDidLoad];
   mapView = [[MKMapView alloc]initWithFrame:
   CGRectMake(10, 100, 300, 300)];
   mapView.delegate = self;
   mapView.centerCoordinate = CLLocationCoordinate2DMake(37.32, -122.03);
   mapView.mapType = MKMapTypeHybrid;
   CLLocationCoordinate2D location;
   location.latitude = (double) 37.332768;
   location.longitude = (double) -122.030039;
   
   // Add the annotation to our map view
   MapAnnotation *newAnnotation = [[MapAnnotation alloc]
   initWithTitle:@"Apple Head quaters" andCoordinate:location];
   [mapView addAnnotation:newAnnotation];
   CLLocationCoordinate2D location2;
   location2.latitude = (double) 37.35239;
   location2.longitude = (double) -122.025919;
   MapAnnotation *newAnnotation2 = [[MapAnnotation alloc] 
   initWithTitle:@"Test annotation" andCoordinate:location2];
   [mapView addAnnotation:newAnnotation2];
   [self.view addSubview:mapView];
}

// When a map annotation point is added, zoom to it (1500 range)
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views {
   MKAnnotationView *annotationView = [views objectAtIndex:0];
   id <MKAnnotation> mp = [annotationView annotation];
   MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance
   ([mp coordinate], 1500, 1500);
   [mv setRegion:region animated:YES];
   [mv selectAnnotation:mp animated:YES];
}

- (void)didReceiveMemoryWarning {
   [super didReceiveMemoryWarning];
   // Dispose of any resources that can be recreated.
}
@end

Output

When we run the application, we'll get the output as shown below −

When we scroll the map up, we will get the output as shown below −