Creating a new CLLocationCoordinate2D at custom Latitude/Longitude

Question

I feel bad for asking this because it seems to be such a simple thing to get hung up on, but I've looked at every relevant resource I could, tried as many of the combinations for solutions that i've seen others use, and nothing has worked...

I am trying to iterate through some XML that I recieve and parse out the Latitude and Longitude of a coordinate in the XML, and store it in an array from which I will then plot it.

My problem is that no matter what type I use, how I cast it, what have you, xcode ALWAYS finds some sort of issue with it.

Relevant part of my .h file:

CLLocationCoordinate2D Coord;
CLLocationDegrees lat;
CLLocationDegrees lon;

@property (nonatomic, readwrite) CLLocationCoordinate2D Coord;
@property (nonatomic, readwrite) CLLocationDegrees lat;
@property (nonatomic, readwrite) CLLocationDegrees lon;

Relevant part of my .m file:

else if ([elementName isEqualToString:@"Lat"]) {
        checkpoint.lat = [[attributeDict objectForKey:@"degrees"] integerValue];
}
else if ([elementName isEqualToString:@"Lon"]) {
    checkpoint.lon = [[attributeDict objectForKey:@"degrees"] integerValue];
}
else if ([elementName isEqualToString:@"Coord"]) {
    checkpoint.Coord = [[CLLocation alloc] initWithLatitude:checkpoint.lat longitude:checkpoint.lon];
}

The current error that I am getting is: "Assigning to 'CLLocationCoordinate2D from incompatible type 'id''. I take that to mean that the return value of the initialization function is incorrect, but I have no idea why since its a built in function...

I have also tried what would make the most sense to me that I saw someone else doing:

checkpoint.Coord = CLLocationCoordinate2DMake(checkpoint.lat, checkpoint.lon);

While that returns no immediate errors, when I try to build and run it gives me:

Undefined symbols for architecture i386: "_CLLocationCoordinate2DMake", referenced from: -[XMLParser parser:didStartElement:namespaceURI:qualifiedName:attributes:] in Checkpoint.o ld: symbol(s) not found for architecture i386 collect2: ld returned 1 exit status

Any help/clarification/nudges in the right direction would be very much appreciated because I am very out of ideas at this point.

Never feel bad for asking such simple questions; that's what we're here for. — Mick Byrne, Feb 13 '13 at 11:13

score 50 · Accepted Answer · answered Jul 18 '11 at 21:19

50

What made the most sense to you (CLLocationCoordinate2DMake) is correct. You just forgot to include the CoreLocation framework in your project.

And, as others have pointed out, your lat/lon in your file are probably not integers.

answered Jul 18 '11 at 21:19

Firoze Lafeer

17,133
4
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Ah that makes sense, I figured that it had to do with a missing framework >.< Thank you! I'm probably going to go with this because trying to set them any other way still gives me errors. – Karoly S Jul 18 '11 at 22:31

Pedro Romão · Answer 2 · 2016-03-02T12:25:32.427

10

what i did was: first create a CLLocationCoordinate2D:

CLLocationCoordinate2D c2D = CLLocationCoordinate2DMake(CLLocationDegrees latitude, CLLocationDegrees longitude);

my latitude and longitude are double types.

in your Imports be sure Mapkit library is imported.

#import <MapKit/MapKit.h>

edited Mar 02 '16 at 12:25

answered Jul 21 '14 at 15:34

Pedro Romão

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28
22

score 4 · Answer 3 · answered Jul 18 '11 at 21:19

4

This should work.

CLLocationCoordinate2D center;
.....
else if ([elementName isEqualToString:@"Lat"]) {
    center.latitude = [[attributeDict objectForKey:@"degrees"] doubleValue];
}
else if ([elementName isEqualToString:@"Lon"]) {
    center.longitude = [[attributeDict objectForKey:@"degrees"] doubleValue];
}

answered Jul 18 '11 at 21:19

Kal

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Hey Kal, thanks for the quick response but unfortunately I'm getting the same error set that Joris's suggestion gets me. If you(or Joris) have any ideas about why, I'd love to give them a shot. Thanks! – Karoly S Jul 18 '11 at 22:34

Joris Mans · Answer 4 · 2011-07-19T10:07:13.940

2

try changing

[[attributeDict objectForKey:@"degrees"] integerValue]

into

[[attributeDict objectForKey:@"degrees"] floatValue]

also

checkpoint.Coord = [[CLLocation alloc] ....

can't be correct as you defined Coord as being CLLocationCoordinate2D, which is

not a CLLocation
not a class but a struct

what you should do is:

    CLLocationCoordinate2D coordinate;    

    else if ([elementName isEqualToString:@"Lat"]) {
        coordinate.latitude = [[attributeDict objectForKey:@"degrees"] floatValue];
    }
    else if ([elementName isEqualToString:@"Lon"]) {
        coordinate.longitude = [[attributeDict objectForKey:@"degrees"] floatValue];
    }

    checkpoint.Coord = coordinate;

edited Jul 19 '11 at 10:07

answered Jul 18 '11 at 21:19

Joris Mans

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Hey Joris, thanks for the quick reply! I appreciate the clarification and it makes quite a bit of sense. I gave the changes you suggested a shot and I ended up getting a "Expression is not assignable" error. My code is identical to what you suggested, I don't really have any idea why xcode doesnt approve. If there is any way I could give you more information let me know, and I'll edit the main question! Thank you! – Karoly S Jul 18 '11 at 22:24
Realize this is pretty old, but the CLLocationDegrees type (which CLLocationCoordinate2d is made up of) is a double rather than a float...depending on how much resolution you need, you want to call doubleValue instead of floatValue. – Reid May 29 '14 at 17:37

Creating a new CLLocationCoordinate2D at custom Latitude/Longitude

4 Answers4