Signed-off-by: Guy Cohen <[email protected]>

First Commit

Sources/ExifModifier/ExifData.swift

@@ -0,0 +1,127 @@
+//
+//  File.swift
+//  
+//
+//  Created by Guy Cohen on 20/09/2021.
+//
+
+import Foundation
+import ImageIO
+import CoreLocation
+
+public class ExifData {
+
+    var imageMetaData = [String: Any]()
+
+    public func exifData() -> [String: Any] { imageMetaData }
+
+    public func addDescripton(_ description: String) { tiffDictionary[kCGImagePropertyTIFFImageDescription as String] = description }
+
+    public func addProjection(_ projection: String) { exifDictionary[Self.kCGImagePropertyProjection as String] = projection }
+
+    public func addCreationDate(_ date: Date?) {
+        guard let dateStr = getUTCFormattedDate(date) else { return }
+        exifDictionary[kCGImagePropertyExifDateTimeOriginal as String] = dateStr
+    }
+
+    public func addUserComment(_ comment: String){ exifDictionary[kCGImagePropertyExifUserComment as String] = comment }
+
+    public func add(_ currentLocation: CLLocation?) {
+
+        var latitude = currentLocation?.coordinate.latitude ?? 0
+        var longitude = currentLocation?.coordinate.longitude ?? 0
+
+        var latitudeRef: String? = nil
+        var longitudeRef: String? = nil
+
+        if latitude < 0.0 {
+            latitude *= CLLocationDegrees(-1)
+            latitudeRef = "S"
+        } else {
+            latitudeRef = "N"
+        }
+
+        if longitude < 0.0 {
+            longitude *= CLLocationDegrees(-1)
+            longitudeRef = "W"
+        } else {
+            longitudeRef = "E"
+        }
+
+        gpsDictionary[kCGImagePropertyGPSTimeStamp as String] = getUTCFormattedDate(currentLocation?.timestamp)
+
+        gpsDictionary[kCGImagePropertyGPSLatitudeRef as String] = latitudeRef ?? ""
+        gpsDictionary[kCGImagePropertyGPSLatitude as String] = NSNumber(value: Float(latitude))
+
+        gpsDictionary[kCGImagePropertyGPSLongitudeRef as String] = longitudeRef ?? ""
+        gpsDictionary[kCGImagePropertyGPSLongitude as String] = NSNumber(value: Float(longitude))
+
+        gpsDictionary[kCGImagePropertyGPSDOP as String] = NSNumber(value: Float(currentLocation?.horizontalAccuracy ?? 0.0))
+        gpsDictionary[kCGImagePropertyGPSAltitude as String] = NSNumber(value: Float(currentLocation?.altitude ?? 0.0))
+    }
+
+}
+
+fileprivate extension ExifData {
+
+    func dictionaryForKey(key: String) -> [String: Any] {
+        if let existedDict = imageMetaData[key] as? [String: Any] {
+            return existedDict
+        }
+        let dic =  [String: Any]()
+        imageMetaData[key] = dic
+        return dic
+    }
+
+    func getUTCFormattedDate(_ localDate: Date?) -> String? {
+        if let localDate = localDate {
+            return Self.getUTCDateFormatter?.string(from: localDate)
+        }
+        return nil
+    }
+
+    var exifDictionary: [AnyHashable : Any] {
+        get {
+            if let existedDict = imageMetaData[kCGImagePropertyExifDictionary as String] as? [String: Any] {
+                return existedDict
+            }
+            let dic =  [String: Any]()
+            imageMetaData[kCGImagePropertyExifDictionary as String] = dic
+            return dic
+        }
+        set { imageMetaData[kCGImagePropertyExifDictionary as String] = newValue }
+    }
+
+    var tiffDictionary: [AnyHashable : Any] {
+        get {
+            if let existedDict = imageMetaData[kCGImagePropertyTIFFDictionary as String] as? [String: Any] {
+                return existedDict
+            }
+            let dic =  [String: Any]()
+            imageMetaData[kCGImagePropertyTIFFDictionary as String] = dic
+            return dic
+        }
+        set { imageMetaData[kCGImagePropertyTIFFDictionary as String] = newValue }
+    }
+
+    var gpsDictionary: [AnyHashable : Any] {
+        get {
+            if let existedDict = imageMetaData[kCGImagePropertyGPSDictionary as String] as? [String: Any] {
+                return existedDict
+            }
+            let dic =  [String: Any]()
+            imageMetaData[kCGImagePropertyGPSDictionary as String] = dic
+            return dic
+        }
+        set { imageMetaData[kCGImagePropertyGPSDictionary as String] = newValue }
+    }
+
+    static let getUTCDateFormatter: DateFormatter? = {
+        var dateFormatter = DateFormatter()
+        dateFormatter.dateFormat = "yyyy:MM:dd HH:mm:ss"
+        return dateFormatter
+    }()
+
+    static let kCGImagePropertyProjection = "ProjectionType"
+
+}

Sources/ExifModifier/Extensions.swift

@@ -0,0 +1,56 @@
+//
+//  File.swift
+//  
+//
+//  Created by Guy Cohen on 20/09/2021.
+//
+
+import UIKit
+
+public extension UIImage {
+
+    func addExif(_ container: ExifData) -> Data? {
+
+        let imageData = self.jpegData(compressionQuality: 1.0)
+
+        // create an imagesourceref
+        var source: CGImageSource? = nil
+        if let data = imageData as CFData? {
+            source = CGImageSourceCreateWithData(data, nil)
+        }
+
+        // this is the type of image (e.g., public.jpeg)
+        var UTI: CFString? = nil
+        if let source = source {
+            UTI = CGImageSourceGetType(source)
+        }
+
+        // create a new data object and write the new image into it
+        let dest_data = Data()
+        var destination: CGImageDestination? = nil
+        if let UTI = UTI {
+            destination = CGImageDestinationCreateWithData(dest_data as! CFMutableData, UTI, 1, nil)
+        }
+
+        if destination == nil {
+            print("Error: Could not create image destination")
+        }
+
+        // add the image contained in the image source to the destination, overidding the old metadata with our modified metadata
+        if let destination = destination, let source = source {
+            CGImageDestinationAddImageFromSource(destination, source, 0, container.exifData as! CFDictionary?)
+        }
+        var success = false
+        if let destination = destination {
+            success = CGImageDestinationFinalize(destination)
+        }
+
+        if !success {
+            print("Error: Could not create data from image destination")
+        }
+
+
+        return dest_data
+    }
+
+}