?
Solved

Need help displaying GPS location on MAP

Posted on 2010-08-25
4
Medium Priority
?
1,796 Views
Last Modified: 2013-11-25
I'm not to iPhone development... so I'm still learning...

I'm creating a simple iPhone app to display my current location on the map.

I'm using this tutorial to see how I can display the map on the iPhone... but the location (lat, long) is hard coded.

http://blancer.com/tutorials/i-phone/76877/mapkit-example-in-iphone/

Everything works fine...

Now I found another tutorial that gets your location using the GPS..

http://www.vellios.com/2010/08/16/core-location-gps-tutorial/


My question is, since in the second tutorial they display the information on labels I was wondering how can I pass that information back to the map.

Here is the code that I need to update. How can I create a variable to replace the region information with the data collected from the iPhone GPS...

Thanks...

- (void)viewDidLoad {
    [super viewDidLoad];
       
        [mapView setMapType:MKMapTypeStandard];
        [mapView setZoomEnabled:YES];
        [mapView setScrollEnabled:YES];
        MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
        region.center.latitude = 22.569722 ;
        region.center.longitude = 88.369722;
        region.span.longitudeDelta = 0.01f;
        region.span.latitudeDelta = 0.01f;
        [mapView setRegion:region animated:YES];
       
        [mapView setDelegate:self];
       
        DisplayMap *ann = [[DisplayMap alloc] init];
        ann.title = @" Kolkata";
        ann.subtitle = @"Mahatma Gandhi Road";
        ann.coordinate = region.center;
        [mapView addAnnotation:ann];
}

Open in new window

0
Comment
Question by:Medrise
  • 2
  • 2
4 Comments
 
LVL 2

Expert Comment

by:tisaksen
ID: 33520236
You need to do that in the CLLocationManagerDelegate method locationManager:didUpdateToLocation:fromLocation:

Then just use the data you get in that method to create your region struct.
0
 

Author Comment

by:Medrise
ID: 33522528
Thanks, I will try that later today...
0
 

Author Comment

by:Medrise
ID: 33526748
I moved the information to the locationManager:didUpdateToLocation

but now I get the world map, and not the location I need.

Here is the code.
- (void)viewDidLoad {
    [super viewDidLoad];
	
	//GET CURRENT LOCATION
	CLController = [[coreLocationController alloc] init];
	CLController.delegate = self;
	[CLController.locMgr startUpdatingLocation];
}

- (void)locationUpdate:(CLLocation *)location {
	//latitudeLabel = [NSString stringWithFormat:@"%f", location.coordinate.latitude];
	//longitudeLabel = [NSString stringWithFormat:@"%f", location.coordinate.longitude];
	
	[mapView setMapType:MKMapTypeStandard];
	[mapView setZoomEnabled:YES];
	[mapView setScrollEnabled:YES];
	
	MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
	
	region.center.latitude = location.coordinate.latitude;
	region.center.longitude = location.coordinate.longitude;
	region.span.longitudeDelta = 1.04*(126.766667 - 66.95);
	region.span.latitudeDelta = 1.04*(49.384472 - 24.520833);
	
	[mapView setRegion:region animated:YES];
	
	[mapView setDelegate:self];
	
	displayMap *ann = [[displayMap alloc] init];
	ann.title = @" Kolkata";
	ann.subtitle = @"Mahatma Gandhi Road";
	ann.coordinate = region.center;
	
	[mapView addAnnotation:ann];
}

Open in new window

0
 
LVL 2

Accepted Solution

by:
tisaksen earned 2000 total points
ID: 33528132
I guess locationUpdate is called by the delegate method I mentioned.
Anyway try this:

#define kZoomRadius 1000
// create map region
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(location.coordinate, kZoomRadius, kZoomRadius);
// for correcting map aspect view
MKCoordinateRegion adjustRegion = [mapView regionThatFits:region];
// finally set the map region
[self.mapView setRegion:adjustRegion animated:YES];
            
where kZoomRadius is in meters
0

Featured Post

Vote for the Most Valuable Expert

It’s time to recognize experts that go above and beyond with helpful solutions and engagement on site. Choose from the top experts in the Hall of Fame or on the right rail of your favorite topic page. Look for the blue “Nominate” button on their profile to vote.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to take pictures with depth using iOS 10
Is your phone running out of space to hold pictures?  This article will show you quick tips on how to solve this problem.
The goal of this video is to provide viewers with basic examples to understand how to create, access, and change arrays in the C programming language.
The goal of this video is to provide viewers with basic examples to understand and use switch statements in the C programming language.

850 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question