IOS Map Development

Introduction

IOS maps help us locate positions, and IOS maps use the MapKit framework.

Example Steps

1. Create a simple View-based application.

2. Select the project file, then select the target, and add MapKit.framework.

3. Add CoreLocation.framework.

4. Add a map view to ViewController.xib and create an ibOutlet named mapView.

5. Create a new file via "File -> New -> File... ->" and select Objective-C class, then click Next.

6. Set "subclass of" to NSObject and name the class MapAnnotation.

7. Choose to create.

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
   

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
   

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
    

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 Headquarters" 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 the application is run, the output is as follows: