Saving image and then loading it in Swift (iOS)

Question

I am saving an image using saveImage.

func saveImage (image: UIImage, path: String ) -> Bool{      let pngImageData = UIImagePNGRepresentation(image)     //let jpgImageData = UIImageJPEGRepresentation(image, 1.0)   // if you want to save as JPEG      print("!!!saving image at:  \(path)")      let result = pngImageData!.writeToFile(path, atomically: true)      return result } 

New info:

Saving file does not work properly ("[-] ERROR SAVING FILE" is printed)--

            // save your image here into Document Directory         let res = saveImage(tempImage, path: fileInDocumentsDirectory("abc.png"))         if(res == true){             print ("[+] FILE SAVED")         }else{             print ("[-] ERROR SAVING FILE")         } 

Why doesn't the saveImage function save the image? Access rights?

Older info:

The debug info says:

!!!saving image at:  file:///var/mobile/Applications/BDB992FB-E378-4719-B7B7-E9A364EEE54B/Documents/tempImage 

Then I retrieve this location using

fileInDocumentsDirectory("tempImage") 

The result is correct.

Then I am loading the file using this path

    let image = UIImage(contentsOfFile: path)      if image == nil {          print("missing image at: \(path)")     }else{         print("!!!IMAGE FOUND at: \(path)")     } 

The path is correct, but the message is "missing image at..". Is the file somehow inaccessible or not stored? What can be a reason for this behavior?

I am testing this code on iphone 4 with ios 7 and iphone 5 with ios 7 simulator.

Edit: 1. The fileInDocumentsDirectory function

func fileInDocumentsDirectory(filename: String) -> String {      let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]     let fileURL = documentsURL.URLByAppendingPathComponent(filename).absoluteString     return fileURL         } 

Answer 1

This function will save an image in the documents folder:

func saveImage(image: UIImage) -> Bool {     guard let data = UIImageJPEGRepresentation(image, 1) ?? UIImagePNGRepresentation(image) else {         return false     }     guard let directory = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false) as NSURL else {         return false     }     do {         try data.write(to: directory.appendingPathComponent("fileName.png")!)         return true     } catch {            print(error.localizedDescription)         return false     } } 

To use:

let success = saveImage(image: UIImage(named: "image.png")!) 

---

This function will get that image:

func getSavedImage(named: String) -> UIImage? {     if let dir = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false) {         return UIImage(contentsOfFile: URL(fileURLWithPath: dir.absoluteString).appendingPathComponent(named).path)     }     return nil } 

To use:

if let image = getSavedImage(named: "fileName") {     // do something with image } 

Answer 2

iOS 13+ Swift 5.1

iOS 12 introduced some API Changes.

func saveImage(imageName: String, image: UIImage) {    guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }      let fileName = imageName     let fileURL = documentsDirectory.appendingPathComponent(fileName)     guard let data = image.jpegData(compressionQuality: 1) else { return }      //Checks if file exists, removes it if so.     if FileManager.default.fileExists(atPath: fileURL.path) {         do {             try FileManager.default.removeItem(atPath: fileURL.path)             print("Removed old image")          } catch let removeError {             print("couldn't remove file at path", removeError)         }      }      do {         try data.write(to: fileURL)     } catch let error {         print("error saving file with error", error)      }  }    func loadImageFromDiskWith(fileName: String) -> UIImage? {    let documentDirectory = FileManager.SearchPathDirectory.documentDirectory      let userDomainMask = FileManager.SearchPathDomainMask.userDomainMask     let paths = NSSearchPathForDirectoriesInDomains(documentDirectory, userDomainMask, true)      if let dirPath = paths.first {         let imageUrl = URL(fileURLWithPath: dirPath).appendingPathComponent(fileName)         let image = UIImage(contentsOfFile: imageUrl.path)         return image      }      return nil }