How do i save and recall a UIImage on the View Controller?

Question

I am using Swift 3 and have been following apples https://developer.apple.com/library/content/referencelibrary/GettingStarted/DevelopiOSAppsSwift/Lesson4.html have created 20 different UIImage views on 20 different UIViewcontroller

They are called photoImageView1 photoImageView2 etc. currently you are able to click on each generic image and input your own image.

I would like the user to be able to input their image but also save it and when they re-open that same viewcontroller the image they inputed is there.

I have looked at many different methods however have been unsuccessful i have attempted following this question Save images in NSUserDefaults? and was once again unsuccessful. Any help would be much appreciated, Thanks.

When you are "imput" you own Image, you must be using UIImagePickerController. So Save those Images you selected, In DocumentDirectory (Make sure you uniquely name them) and Store there path in ARRAY / .PLIST / Or MODEL. — Wolverine, Oct 25 '16 at 10:30

score 1 · Accepted Answer · answered Mar 22 '17 at 11:36

i ended up using this method it may not be the best but its easy and it works.

import UIKit


class timetable: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

@IBOutlet var imageviewtimetable: UIImageView!

@IBAction func saveMyImage(_ sender: UIBarButtonItem) {

    let myTimeTableImage = imageviewtimetable.image
    let theImageData:NSData = UIImagePNGRepresentation(myTimeTableImage!)! as NSData

    UserDefaults.standard.set(theImageData, forKey: "mySavedImage")

    let data = UserDefaults.standard.object(forKey: "mySavedImage")
    imageviewtimetable.image = UIImage(data: data as! Data)



}




   override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.



    let data = UserDefaults.standard.object(forKey: "mySavedImage")
    imageviewtimetable.image = UIImage(data: data as! Data)

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func selectImageFromPhotoLibrary(_ sender: Any) {

    let imagePickerController = UIImagePickerController()
    imagePickerController.sourceType = .photoLibrary
    imagePickerController.delegate = self
    present(imagePickerController, animated: true, completion: nil)


}



func imagePickerControllerDidCancel(_ picker: UIImagePickerController){
    dismiss(animated: true, completion:nil)
}


func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

    let selectedImage = info[UIImagePickerControllerOriginalImage] as! UIImage
    imageviewtimetable.image = selectedImage

    dismiss(animated: true,completion:nil)
}



/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/

}

Josh Homann · Answer 2 · 2016-10-25T21:33:21.553

0

You can store the image name in a database, iCloud, a plist or even Userdefaults. To save an image to disk, but not the photo library, use:

    import PlaygroundSupport
    import UIKit

    func save(image: UIImage, name: String) -> Bool {
        guard var path = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first,
            let imageData = UIImagePNGRepresentation(image) else {
                return false
        }
        path = path.appendingPathComponent(name)
        do {
            try imageData.write(to: path)
        } catch {
            return false
        }
        return true
    }

    func loadImage(name: String) -> UIImage? {
        guard var path = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else {
            return nil
        }
        path = path.appendingPathComponent(name)
        return UIImage(contentsOfFile: path.relativePath)
    }

    let image = UIImage(named: "test.png")!
    save(image: image, name: "test2.png")
    let loadedImage = loadImage(name: "test2.png")
    PlaygroundPage.current.liveView = UIImageView(image: loadedImage)

EDIT: I changed the source code to a full playground so you can copy and paste it into a playground and run it. The only thing you need to do is drag a file named test.png into the Resources folder.

edited Oct 25 '16 at 21:33

answered Oct 25 '16 at 14:52

Josh Homann

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am i meant to change then the (let imageData = UIImagePNGRepresentation(image) else {) image part? and if so what to? it comes up with the error missing parameter when i use the functions and when i change it to what else i would imagine it would be i get the error cannot use type of UIImageView on type UIImage. – Yellow Oct 25 '16 at 20:21
i think i have to declear it under a name dont i? then put that name there. where image is.... then under (name) put in the name to save it under file directory – Yellow Oct 25 '16 at 20:32
name is the file name. it gets saved in the documents directory. You could make your own directory under the documents directory, but this example doesn't do t hat. The code works as is; I tested it in a playground. You can change UIImagePNGRepresentation to UIImageJPGRepresentation if you don't mind lossy compression. – Josh Homann Oct 25 '16 at 21:20
Works so far ill try adding it to the program later, thanks – Yellow Oct 25 '16 at 23:34

How do i save and recall a UIImage on the View Controller?

2 Answers2