[Objective-C] CLLocation から経度緯度標高を取得する

ちょろっと書いて動かしてみたら動いたのでメモ。

これで取得できる内容をEvernote のノート作成時に盛りたい。

// CoreLocation.framework の追加と、ヘッダーインポートをしておくこと
- (NSDictionary *)GPSDictionaryForLocation:(CLLocation *)location
{
    NSMutableDictionary *gps = [NSMutableDictionary new];
    
    NSDateFormatter *formatter = [NSDateFormatter new];
    [formatter setDateFormat:@"HH:mm:ss.SSSSSS"];
    [formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
    [gps setObject:[formatter stringFromDate:location.timestamp] forKey:(NSString *)kCGImagePropertyGPSTimeStamp];
    [formatter setDateFormat:@"yyyy:MM:dd"];
    [gps setObject:[formatter stringFromDate:location.timestamp] forKey:(NSString *)kCGImagePropertyGPSDateStamp];
    
    // 緯度
    CGFloat latitude = location.coordinate.latitude;
    NSString *gpsLatitudeRef;
    if (latitude < 0) {
        latitude = -latitude;
        gpsLatitudeRef = @"S";
    } else {
        gpsLatitudeRef = @"N";
    }
    gps[(NSString *)kCGImagePropertyGPSLatitudeRef] = gpsLatitudeRef;
    gps[(NSString *)kCGImagePropertyGPSLatitude] = @(latitude);
    
    // 経度
    CGFloat longitude = location.coordinate.longitude;
    NSString *gpsLongitudeRef;
    if (longitude < 0) {
        longitude = -longitude;
        gpsLongitudeRef = @"W";
    } else {
        gpsLongitudeRef = @"E";
    }
    gps[(NSString *)kCGImagePropertyGPSLongitudeRef] = gpsLongitudeRef;
    gps[(NSString *)kCGImagePropertyGPSLongitude] = @(longitude);
    
    // 標高
    CGFloat altitude = location.altitude;
    if (!isnan(altitude)){
        NSString *gpsAltitudeRef;
        if (altitude < 0) {
            altitude = -altitude;
            gpsAltitudeRef = @"1";
        } else {
            gpsAltitudeRef = @"0";
        }
        gps[(NSString *)kCGImagePropertyGPSAltitudeRef] = gpsAltitudeRef;
        gps[(NSString *)kCGImagePropertyGPSAltitude] = @(altitude);
    }
    
    return gps;
}