-
-
Save hjue/6067606 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#import <CoreLocation/CoreLocation.h> | |
#import <ImageIO/ImageIO.h> | |
@interface CLLocation (EXIFGPS) | |
- (NSDictionary*) EXIFMetadataWithHeading:(CLHeading*)heading; | |
@end | |
@interface NSDate (EXIFGPS) | |
- (NSString*) ISODate; | |
- (NSString*) ISOTime; | |
@end |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#import "CLLocation+EXIFGPS.h" | |
NSString * const ISODateFormat = @"yyyy-MM-dd"; | |
NSString * const ISOTimeFormat = @"HH:mm:ss.SSSSSS"; | |
@implementation CLLocation (EXIFGPS) | |
- (NSDictionary*) EXIFMetadataWithHeading:(CLHeading*)heading | |
{ | |
NSMutableDictionary *GPSMetadata = [NSMutableDictionary dictionary]; | |
NSNumber *altitudeRef = [NSNumber numberWithInteger: self.altitude < 0.0 ? 1 : 0]; | |
NSString *latitudeRef = self.coordinate.latitude < 0.0 ? @"S" : @"N"; | |
NSString *longitudeRef = self.coordinate.longitude < 0.0 ? @"W" : @"E"; | |
NSString *headingRef = @"T"; // T: true direction, M: magnetic | |
// GPS metadata | |
[GPSMetadata setValue:[NSNumber numberWithDouble:ABS(self.coordinate.latitude)] forKey:(NSString*)kCGImagePropertyGPSLatitude]; | |
[GPSMetadata setValue:[NSNumber numberWithDouble:ABS(self.coordinate.longitude)] forKey:(NSString*)kCGImagePropertyGPSLongitude]; | |
[GPSMetadata setValue:latitudeRef forKey:(NSString*)kCGImagePropertyGPSLatitudeRef]; | |
[GPSMetadata setValue:longitudeRef forKey:(NSString*)kCGImagePropertyGPSLongitudeRef]; | |
[GPSMetadata setValue:[NSNumber numberWithDouble:ABS(self.altitude)] forKey:(NSString*)kCGImagePropertyGPSAltitude]; | |
[GPSMetadata setValue:altitudeRef forKey:(NSString*)kCGImagePropertyGPSAltitudeRef]; | |
[GPSMetadata setValue:[self.timestamp ISOTime] forKey:(NSString*)kCGImagePropertyGPSTimeStamp]; | |
[GPSMetadata setValue:[self.timestamp ISODate] forKey:(NSString*)kCGImagePropertyGPSDateStamp]; | |
if (heading) { | |
[GPSMetadata setValue:[NSNumber numberWithDouble:heading.trueHeading] forKey:(NSString*)kCGImagePropertyGPSImgDirection]; | |
[GPSMetadata setValue:headingRef forKey:(NSString*)kCGImagePropertyGPSImgDirectionRef]; | |
} | |
return [GPSMetadata copy]; | |
} | |
@end | |
#pragma mark - | |
@implementation NSDate (EXIFGPS) | |
- (NSString*) ISODate | |
{ | |
NSDateFormatter *f = [[NSDateFormatter alloc] init]; | |
[f setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; | |
[f setDateFormat:ISODateFormat]; | |
return [f stringFromDate:self]; | |
} | |
- (NSString*) ISOTime | |
{ | |
NSDateFormatter *f = [[NSDateFormatter alloc] init]; | |
[f setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; | |
[f setDateFormat:ISOTimeFormat]; | |
return [f stringFromDate:self]; | |
} | |
@end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment