iOS - iOS - Accessing Maps


iOS - Accessing Maps



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 âˆ'
 
  #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 âˆ'
 
 #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 âˆ'
 
 #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  




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