Merge pull request #849 from techinpark/feature/exif

Extract EXIF-only metadata for image cropping

Author: NikKovIos

Source/Helpers/Extensions/PHCachingImageManager+Extensions.swift

@@ -39,20 +39,24 @@ extension PHCachingImageManager {
                                             height: targetSize.height)
                 if let imageRef = image.cgImage?.cropping(to: scaledCropRect) {
                     let croppedImage = UIImage(cgImage: imageRef)
-                    let exifs = self.metadataForImageData(data: data)
+                    let exifs = self.exifDataForImageData(data: data)
                     callback(croppedImage, exifs)
                 }
             }
         }
     }
 
-    private func metadataForImageData(data: Data) -> [String: Any] {
+    private func exifDataForImageData(data: Data) -> [String: Any] {
+        var exifData: [String: Any] = [:]
+
         if let imageSource = CGImageSourceCreateWithData(data as CFData, nil),
-        let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil),
-        let metaData = imageProperties as? [String: Any] {
-            return metaData
+            let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil),
+            let propertiesDict = imageProperties as? [String: Any],
+            let exifDict = propertiesDict[kCGImagePropertyExifDictionary as String] as? [String: Any] {
+            exifData = exifDict
         }
-        return [:]
+
+        return exifData
     }
 
     func fetchPreviewFor(video asset: PHAsset, callback: @escaping (UIImage) -> Void) {