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iOS Accessing Maps

Maps are useful for everyone in locating places. Maps are integrated in iOS using the MapKit framework.

Steps Involved

  • Step 1.We need to create a simple view-based application.
  • Step 2. We need toselect your project file, then select targets and then add MapKit.framework.
  • Step 3. We should also add Corelocation.framework.
  • Step 4.We need toadd a MapView to ViewController.xib and create an ibOutlet and name it as mapView.
  • Step 5.We need tocreate 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. We need toupdate MapAnnotation.h as stated below:

#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