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POProblem in writing metadata to image
 

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    <p>I am using AvFoundation to take still image and adding gps info to metadata and saving to a photo album using Asset library but gps info is not saving at all. </p> <p>here is my code...</p> <pre><code>[self.stillImageTaker captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) { if (imageDataSampleBuffer != NULL) { CFDictionaryRef exifAttachments = CMGetAttachment(imageDataSampleBuffer,kCGImagePropertyExifDictionary, NULL); CFDictionaryRef metadataDict = CMCopyDictionaryOfAttachments(NULL, imageDataSampleBuffer, kCMAttachmentMode_ShouldPropagate); NSDictionary *gpsDict = [NSDictionary dictionaryWithObjectsAndKeys:@"1",kCGImagePropertyGPSVersion, @"78.4852",kCGImagePropertyGPSLatitude,@"32.1456",kCGImagePropertyGPSLongitude, nil]; CMSetAttachment(imageDataSampleBuffer,kCGImagePropertyGPSDictionary,gpsDict,kCMAttachmentMode_ShouldPropagate); CFDictionaryRef newMetadata = CMCopyDictionaryOfAttachments(NULL, imageDataSampleBuffer, kCMAttachmentMode_ShouldPropagate); CFDictionaryRef gpsAttachments = CMGetAttachment(imageDataSampleBuffer,kCGImagePropertyGPSDictionary, NULL); if (exifAttachments) { // Attachments may be read or additional ones written } NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer]; UIImage *image = [[UIImage alloc] initWithData:imageData]; ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; / NSDictionary *newDict = (NSDictionary *)newMetadata; [library writeImageToSavedPhotosAlbum:[image CGImage] metadata:newDict completionBlock:^(NSURL *assetURL, NSError *error) { if (error) { } }]; [library release]; [image release]; CFRelease(metadataDict); CFRelease(newMetadata); } else if (error) { } }]; </code></pre>
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    1. COI have the same issue as you. Did you ever find a solution to write exif metadata to a photo? It looks like there are additional exig tags in the attachment, but they never get written out to the photo.
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