Generate Metadata Exif for GPS

GPSExif.swift

//
// Generate EXIF GPS metadata
// Swift 3
// Exif Version 2.2.0.0 supports decimal degrees

import Foundation
import CoreLocation
import ImageIO

extension CLLocation {
    
    func exifMetadata(heading: CLHeading? = nil) -> NSMutableDictionary {

        let GPSMetadata = NSMutableDictionary()
        let altitudeRef = Int(self.altitude < 0.0 ? 1 : 0)
        let latitudeRef = self.coordinate.latitude < 0.0 ? "S" : "N"
        let longitudeRef = self.coordinate.longitude < 0.0 ? "W" : "E"

        // GPS metadata
        GPSMetadata[(kCGImagePropertyGPSLatitude as String)] = abs(self.coordinate.latitude)
        GPSMetadata[(kCGImagePropertyGPSLongitude as String)] = abs(self.coordinate.longitude)
        GPSMetadata[(kCGImagePropertyGPSLatitudeRef as String)] = latitudeRef
        GPSMetadata[(kCGImagePropertyGPSLongitudeRef as String)] = longitudeRef
        GPSMetadata[(kCGImagePropertyGPSAltitude as String)] = Int(abs(self.altitude))
        GPSMetadata[(kCGImagePropertyGPSAltitudeRef as String)] = altitudeRef
        GPSMetadata[(kCGImagePropertyGPSTimeStamp as String)] = self.timestamp.isoTime()
        GPSMetadata[(kCGImagePropertyGPSDateStamp as String)] = self.timestamp.isoDate()
        GPSMetadata[(kCGImagePropertyGPSVersion as String)] = "2.2.0.0"

        if let heading = heading {
            GPSMetadata[(kCGImagePropertyGPSImgDirection as String)] = heading.trueHeading
            GPSMetadata[(kCGImagePropertyGPSImgDirectionRef as String)] = "T"
        }

        return GPSMetadata
    }
}

extension Date {
    
    func isoDate() -> String {
        let f = DateFormatter()
        f.timeZone = TimeZone(abbreviation: "UTC")
        f.dateFormat = "yyyy:MM:dd"
        return f.string(from: self)
    }
    
    func isoTime() -> String {
        let f = DateFormatter()
        f.timeZone = TimeZone(abbreviation: "UTC")
        f.dateFormat = "HH:mm:ss.SSSSSS"
        return f.string(from: self)
    }
}

How to Use this to write in an image?

https://stackoverflow.com/questions/52810822/saving-exif-data-to-jpeg-swift