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I had exactly the same problem. I think the documentation on this topic isn't great, so I solved it in the end by looking at the metadata of a photo taken by the Camera app and trying to replicate it. Here's a run down of the properties the Camera app saves: <ul> <li>kCGImagePropertyGPSLatitude (NSNumber) (Latitude in decimal format)</li> <li>kCGImagePropertyGPSLongitude (NSNumber) (Longitude in decimal format)</li> <li>kCGImagePropertyGPSLatitudeRef (NSString) (Either N or S)</li> <li>kCGImagePropertyGPSLongitudeRef (NSString) (Either E or W)</li> <li>kCGImagePropertyGPSTimeStamp (NSString) (Of the format 04:30:51.71 (UTC timestamp))</li> </ul> If you stick to these you should be fine. Here's a sample: <pre><code>CFDictionaryRef metaDict = CMCopyDictionaryOfAttachments(NULL, imageDataSampleBuffer, kCMAttachmentMode_ShouldPropagate); CFMutableDictionaryRef mutable = CFDictionaryCreateMutableCopy(NULL, 0, metaDict); NSDictionary *gpsDict = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat:self.currentLocation.coordinate.latitude], kCGImagePropertyGPSLatitude, @"N", kCGImagePropertyGPSLatitudeRef, [NSNumber numberWithFloat:self.currentLocation.coordinate.longitude], kCGImagePropertyGPSLongitude, @"E", kCGImagePropertyGPSLongitudeRef, @"04:30:51.71", kCGImagePropertyGPSTimeStamp, nil]; CFDictionarySetValue(mutable, kCGImagePropertyGPSDictionary, gpsDict); // Get the image NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer]; UIImage *image = [[UIImage alloc] initWithData:imageData]; // Get the assets library ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; [library writeImageToSavedPhotosAlbum:[image CGImage] metadata:mutable completionBlock:captureComplete]; </code></pre> This is all in the completionHandler of the captureStillImageAsynchronouslyFromConnection method of your AVCaptureConnection object, and self.currentLocation is just a CLLocation. I hardcoded the timestamp and Lat/Lng Refs for the example to keep things simple. Hope this helps!
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