Core Data and Core Location

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You will have to iterate through them one by one; as far as I know there is no other way to do it.

However, you can make this more efficient by using a bounding box when you get the items from core data – this will reduce the number of objects that will be returned.

i.e. Something like

float latMax = wantedLat + 1;
float latMin = wantedLat - 1;
float lngMax = wantedLng + 1;
float lngMin = wantedLng - 1;
NSPredicate *predicate = [NSPredicate
    predicateWithFormat:@"lat > %f and lat < %f and lng > %f and lng < %f",
    latMin, latMax, lngMin, lngMax];

Though, depending on how much data you have and how closely it’s spaced, you will want to use a different number than 1!

PS Also, I haven’t taken into account the fact that longitude wraps!

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