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iOS Sort XML Data Coordinates (Example: SeismicXML)
- Thread starter Darkroom
- Start date
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i assume you parse your xml data such that you create several objects from the same class, and you store them in an array. i also assume you have a CLLocationCoordinate2D property that stores each object's latitude / longitude. instead of using @synthesize for setting this property, implement your own setter function, that would also create a "distance from here" member variable:
so you reduced the problem to sorting the array of objects by the member called distanceFromHere. in your object's class create an ordering function that you can use for sorting:
and finally, considering you added all your objects to a mutable array while parsing, you can use
Code:
distanceFromHere = [crtLocation getDistanceFrom:[[CLLocation alloc] initWithLatitude:myObjectsCoordinate.latitude longitude:myObjectsCoordinate.longitude]];
Code:
- (NSComparisonResult)compareByDistanceFromHere:(MyClass *)objectICompareWith {
return (distanceFromHere < objectICompareWith.distanceFromHere) ? NSOrderedAscending : NSOrderedDescending;
}
Code:
[allMyObjects sortUsingSelector:@selector(compareByDistanceFromHere:)];
thanks for your help. a few minutes after i posted i actually found this little project where a developer is seasoning apple's SeismicXML example with distance sorting, with plans to include mapkit annotations. his work seems pretty involved for such a simplistic idea, but i guess that's development at its finest.
[EDIT] ouf! your solution seems much more streamlined. this project i am trying to study is a bit crazy and doesn't even seem to work.
[EDIT] ouf! your solution seems much more streamlined. this project i am trying to study is a bit crazy and doesn't even seem to work.
yeah... in the end i simply created a @property float distanceFromUser; and assigned it the distance between the user's current location and another location with CLLocation's getDistanceFrom: method, and then sorted the array with an NSSortDescriptor before adding it to the tableview.
as usual, in hindsight the solution is quite simple. 😱