Can not get proper firebase image save in document directory in swift 4 iOS

i'm saving firebase image in document directory !! For uniqueness my Document Directory name is firebase image name ! i have check with a condition that if firebase image name is not exists in my document directory then save that image in Document Directory !!

i'm checking if that firebase name means it save in document directory then it get document directory image if not then it get image from Firebase !!

Issue is when i try to get image :- (1) For example :- Firebase Image name is 1.jpg . (2) Document Directory save image with firebase name like 1.jpg . (3) now i change firebase image to other but it save with name 1.jpg . (4) when i try to get image because already 1.jpg is in Document Directory that's why it not return me updated image it show me previous 1.jpg image !!
how can i solved this issue. Thank You

Save And Get Image Code :-

 func saveImageDocumentDirectory(imageName: String){
        let documentPath = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
        let imgURL = documentPath.appendingPathComponent(imageName, isDirectory: true)
        if !FileManager.default.fileExists(atPath: imgURL.path){
            do{
            let image = UIImage(named: imgURL.path)
            try image?.pngData()?.write(to: imgURL)
            }catch let err{
                print("error in save:\(err.localizedDescription)")
            }
        }
    }

    func getDocumentImage(imageName: String, firebaseImgURL: URL, imgView:UIImageView){
        let documentPath = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
        let imgURL = documentPath.appendingPathComponent(imageName, isDirectory: true)
        let image = UIImage(contentsOfFile: imgURL.path)
        if image != nil{
            imgView.image = image
        }else{
            imgView.kf.setImage(with: firebaseImgURL)
        }
    }

Solution

Please try with like below code

 Save Data

 let placeholderURL: URL =
 getDocumentDirectoryPath()!.appendingPathComponent("\(imageName.JPG)/",
 isDirectory: true)
 let fileExists: Bool = FileManager.default.fileExists(atPath: placeholderURL.path )


         if !fileExists {

             let thumbnailImageURL = URL(string: firebaseURL)
             var placeholderData: Data? = nil
             if let url = url {
                 do {

                    placeholderData = try Data(contentsOf: (thumbnailImageURL ?? nil)!)
                 } catch {
                     print("Unable to load data: \(error)")
                 }
             }
             if urlData != nil {
                 do {
                     //saving is done on main thread
                     try placeholderData?.write(to: URL(fileURLWithPath: placeholderURL.path) , options: .atomic)
                 } catch {
                     print(error)
                 }

            }
       }

Retrive image

    let thumbnailURL: URL = getDocumentDirectoryPath()!.appendingPathComponent("\("imageName.JPG")/", isDirectory: true)

    let fileExists: Bool = FileManager.default.fileExists(atPath: thumbnailURL.path)


    var urlThumbnail:URL? = nil
    if fileExists {

        urlThumbnail = URL(fileURLWithPath: thumbnailURL.path)
    } else {

        urlThumbnail = URL(string: firebaseURL)
    }

Sat image in image view

self.imgtemp.sd_setImage(with: urlThumbnail, placeholderImage: UIImage(named: "placeholder.png"))