Question

I made a very basic dictionary that just stores a username in it, and I also want to store dynamically generated latlngs in it as well. I can already get the current latlng, and am working on how to track the location and store the new latlngs, which updates based on either distance or time.

How would I go about storing multiple latitudes under the key ‘latitude’ and the same for longitude?

My dictionary with the username is here:

username = Textbox.text;

    NSMutableDictionary *mydata = [[NSMutableDictionary alloc] init ];

    [mydata setObject:username forKey:@"username"];
    NSLog(@"%@", [mydata objectForKey:@"username"]);

My current location code is here:

locationManager =[[CLLocationManager alloc] init];

locationManager.delegate = self; 
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = 100.0f;
[locationManager startUpdatingLocation];

CLLocation *location = [locationManager location];
CLLocationCoordinate2D coordinate = [location coordinate];
NSString *latitude = [NSString stringWithFormat:@"%f", coordinate.latitude];
NSString *longitude = [NSString stringWithFormat:@"%f", coordinate.longitude];

Any help would be greatly appreciated.

Answer 1

If you have two latitudes…

float latitudeA;
float latitudeB;

that you’d like to put in an array, first “wrap” them up as NSNumbers…

NSNumber *numLatitudeA = [NSNumber numberWithFloat:latitudeA];
NSNumber *numLatitudeB = [NSNumber numberWithFloat:latitudeB];

which will let you put them in an array…

NSArray *myLatitudes = [NSArray arrayWithObjects:numLatitudeA, numLatitudeB, nil];

which can be placed in your dictionary (under the key @”latitude” if you want)…

[myData setValue:myLatitudes forKey:@"latitude"];

Though, you might want to associate several latitude arrays with different unique longitudes. If so, instead of using the string @”latitude” as the key, the longitude itself (if it’s an NSNumber) can be a perfectly good key.

NSNumber *numLongitude = [NSNumber numberWithFloat:longitude];
[myData setObject:myLatitudes forKey:numLongitude];