Serialize mkcoordinateregion to store in core data?

Question

Hi all,

What is the best way to store an MKCoordinateRegion using core data? I assume there is a way to convert this to binary data somehow??

Many thanks

Jules

Answer 1

Sorry.... I just found the transformable type in core data, I believe this should do the trick.

Answer 2

My suggestion is to simply store the MKCoordinateRegion's struct values (latitude, longitude, latitudeDelta, and longitudeDelta) as separate properties, and then on your model class provide a custom accessor that assembles these into a MKCoordinateRegion object.

For example:

// Snip...boilerplate CoreData code goes here...
@dynamic latitude;
@dynamic longitude;
@dynamic latitudeDelta;
@dynamic longitudeDelta;

- (MKCoordinateRegion)region {
    CLLocationCoordinate2D center = {
        [self.latitude floatValue],
        [self.longitude floatValue]
    };
    MKCoordinateSpan span = {
        [self.latitudeDelta floatValue],
        [self.longitudeDelta floatValue]
    };

    return MKCoordinateRegionMake(center, span);
}

If you want to be extra clever, you can create a custom read-only property that exposes the internal data as above.