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INSTALL
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Copy all files under 'Classes/ARC' or 'Classes/NonARC' directory into your project.
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USAGE
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#import "GeoHash.h"
/* Get GetHash by latitude, longitude, and hash-length */
NSString *hash = [GeoHash hashForLatitude:35.6894875
longitude:139.6917064
length:13];
/* hash equals to @"xn774c06kdtve" */
/* Decode GeoHash and get an area which the hash indicates */
GHArea *area = [GeoHash areaForHash:@"c216ne"];
area.latitude.max
area.latitude.min
area.longitude.max
area.longitude.min
/* Adjacent */
NSString *adjacentHash = [GeoHash adjacentForHash:@"dqcjq"
direction:GHDirectionNorth];
/* @"dqcjw" */
GHNeighbors *neighbors = [GeoHash neighborsForHash:@"dqcw5"];
neighbors.north
neighbors.south
neighbors.east
neighbors.west
neighbors.northEast
neighbors.northWest
neighbors.southEast
neighbors.southWest
/* check invalid hash */
if (![GeoHash verifyHash:@"abw!@"])
{
...
}