Storing high precision latitude/longitude numbers in iOS Core Data
- by Bryan
I'm trying to store Latitude/Longitudes in core data. These end up being anywhere from 6-20 digit precision.
And for whatever reason, i had them as floats in Core Data, its rounding them and not giving me the exact values back. I tried "decimal" type, with no luck either.
Are NSStrings my only other option?
EDIT
NSManagedObject:
@interface Event : NSManagedObject
{
}
@property (nonatomic, retain) NSDecimalNumber * dec;
@property (nonatomic, retain) NSDate * timeStamp;
@property (nonatomic, retain) NSNumber * flo;
@property (nonatomic, retain) NSNumber * doub;
Here's the code for a sample number that I store into core data:
NSNumber *n = [NSDecimalNumber decimalNumberWithString:@"-97.12345678901234567890123456789"];
Code to access it again:
NSNumber *n = [managedObject valueForKey:@"dec"];
NSNumber *f = [managedObject valueForKey:@"flo"];
NSNumber *d = [managedObject valueForKey:@"doub"];
Printed values:
Printing description of n:
-97.1234567890124
Printing description of f:
<CFNumber 0x603f250 [0xfef3e0]>{value = -97.12345678901235146441, type = kCFNumberFloat64Type}
Printing description of d:
<CFNumber 0x6040310 [0xfef3e0]>{value = -97.12345678901235146441, type = kCFNumberFloat64Type}
