I am trying to write EXIF data to the image but CGImageDestinationFinalize crashes:
var image = info[UIImagePickerControllerOriginalImage] as! UIImage
let jpeg = UIImageJPEGRepresentation(image, 1.0)
var source: CGImageSource? = nil
source = CGImageSourceCreateWithData((jpeg as CFData?)!, nil)
let metadata = CGImageSourceCopyPropertiesAtIndex(source!, 0, nil) as? [AnyHashable: Any]
var metadataAsMutable = metadata
var EXIFDictionary = (metadataAsMutable?[(kCGImagePropertyExifDictionary as String)]) as? [AnyHashable: Any]
var GPSDictionary = (metadataAsMutable?[(kCGImagePropertyGPSDictionary as String)]) as? [AnyHashable: Any]
GPSDictionary![(kCGImagePropertyGPSLatitude as String)] = 30.21313
GPSDictionary![(kCGImagePropertyGPSLongitude as String)] = 76.22346
EXIFDictionary![(kCGImagePropertyExifUserComment as String)] = "Hello Image"
let UTI: CFString = CGImageSourceGetType(source!)!
let dest_data = NSMutableData()
let destination: CGImageDestination = CGImageDestinationCreateWithData(dest_data as CFMutableData, UTI, 1, nil)!
CGImageDestinationAddImageFromSource(destination, source!, 0, (metadataAsMutable as CFDictionary?))
CGImageDestinationFinalize(destination)
Exchangeable Image File Format (EXIF) is a standard that defines specific information related to an image or other media captured by a digital camera. It is capable of storing such important data as camera exposure, date/time the image was captured, and even GPS location.
You need first to copy the exif files located here google exif to your project, then use the following code : ExifInterface exif = new ExifInterface(); exif.
To write Exif data to a JPEG, you need to write an APP1/Exif segment as part of the normal JIF structure. The EXIFWriter will write the data you should put inside this segment only. Everything else must be provided by you.
On a Windows PC using File Explorer right-click on the file you want to see the data for. You will see a window pop up with various options. Click on Properties and then on Details. This will bring up the EXIF data for that photo.
Please check this below answer. you got error due to nil value on EXIFDictionary and GPSDictionary
var image = info[UIImagePickerControllerOriginalImage] as! UIImage
let jpeg = UIImageJPEGRepresentation(image, 1.0)
var source: CGImageSource? = nil
source = CGImageSourceCreateWithData((jpeg as CFData?)!, nil)
let metadata = CGImageSourceCopyPropertiesAtIndex(source!, 0, nil) as? [AnyHashable: Any]
var metadataAsMutable = metadata
var EXIFDictionary = (metadataAsMutable?[(kCGImagePropertyExifDictionary as String)]) as? [AnyHashable: Any]
var GPSDictionary = (metadataAsMutable?[(kCGImagePropertyGPSDictionary as String)]) as? [AnyHashable: Any]
if !(EXIFDictionary != nil) {
EXIFDictionary = [AnyHashable: Any]()
}
if !(GPSDictionary != nil) {
GPSDictionary = [AnyHashable: Any]()
}
GPSDictionary![(kCGImagePropertyGPSLatitude as String)] = 30.21313
GPSDictionary![(kCGImagePropertyGPSLongitude as String)] = 76.22346
EXIFDictionary![(kCGImagePropertyExifUserComment as String)] = "Hello Image"
let UTI: CFString = CGImageSourceGetType(source!)!
let dest_data = NSMutableData()
let destination: CGImageDestination = CGImageDestinationCreateWithData(dest_data as CFMutableData, UTI, 1, nil)!
CGImageDestinationAddImageFromSource(destination, source!, 0, (metadataAsMutable as CFDictionary?))
CGImageDestinationFinalize(destination)
This could be from your destination definition.
This worked for me
(...)
let source = CGImageSourceCreateWithData(jpgData as CFData, nil)
let finalData = NSMutableData()
let destination = getDestination(finalData:finalData, source:source!)
(...)
// Note that :
// NSMutableData type variable will be cast to CFMutableData
//
fileprivate func getDestination(finalData:CFMutableData, source:CGImageSource)->CGImageDestination?{
guard let destination = CGImageDestinationCreateWithData(finalData,
CGImageSourceGetType(source)!,
1,
nil)else{return nil}
return destination
}
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