The image is not from one VC to another VC - ios

Question

The image is not from one VC to another VC.
The problem is displaying it to the image view in the main UIViewController. I have everything hooked up correctly in the Storyboard.
Click here to view my storyboard layout.
Please note some of my unnecessary code has been removed from both ViewController classes.
Here is my first UIViewController:
import UIKit
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
var imagePicker: UIImagePickerController!
#IBAction func editPhoto(_ sender: UIButton) {
let ViewController2 = storyboard?.instantiateViewController(withIdentifier: "AddNewEaterySegue") as! ViewController2
ViewController2.imageForEdit = imageView.image!
print(imageView)
print(imageView.image!)
navigationController?.pushViewController(ViewController2, animated: true)
}
#IBOutlet weak var imageView: UIImageView! {
didSet {
imageView.contentMode = .scaleAspectFill
imageView.clipsToBounds = true
}
}
}
Here is my second UIViewController:
import UIKit
class ViewController2: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
var filter : CIFilter!
var imageForEdit = UIImage()
var imagePicker: UIImagePickerController!
#IBOutlet weak var select: UISegmentedControl!
#IBOutlet weak var imageLabel: UIImageView!
#IBOutlet weak var textField: UITextField!
#IBAction func saveButtonPressed(_ sender: UIImage) {
if textField.text == "" {
print("Не все поля заполнены")
} else {
}
performSegue(withIdentifier: "unwindSegueFromViewController", sender: sender)
}
override func viewDidLoad() {
super.viewDidLoad()
imageLabel.image = imageForEdit
print(imageLabel)
// Do any additional setup after loading the view.
}
#IBAction func tappedEnter(_ sender: Any) {
if textField.text?.isEmpty ?? true {
return
} else {
if let texttxt = textField.text {
let data = texttxt.data(using: .ascii, allowLossyConversion: false)
if select.selectedSegmentIndex == 0
{
filter = CIFilter(name: "CICode128BarcodeGenerator")
} else {
filter = CIFilter(name: "CIQRCodeGenerator")
}
filter.setValue(data, forKey: "inputMessage")
let transform = CGAffineTransform(scaleX: 5, y: 5)
let image = UIImage(ciImage: filter.outputImage!.transformed(by: transform))
imageLabel.image = image
}
}
}
}

Answer 1

When you are pushing to ViewController2 your imageView in ViewController is empty.
Where exactly are you setting the image for imageView?
In your storyboard, the imageView in ViewController is empty and also in the didSet method for imageView in ViewController you have not set any image to the imageView.
Try this in ViewController:
#IBOutlet weak var imageView: UIImageView! {
didSet {
//Add a test image to your project.
imageView.image = UIImage(named: "YOUR_TEST_IMAGE_NAME.jpeg")
imageView.contentMode = .scaleAspectFill
imageView.clipsToBounds = true
}
}
EDIT: Ok I guess I was not clear on your question. So in order to send the image from "ViewController2" back to "ViewController", you can use many methods but the way I would do it is by using Protocols.
I have done it in a generic way but you can apply this to send any kind of data from one view controller back to the previous view controller.
Try this in ViewController:
import UIKit
protocol ImageViewProtocol{
func sendImageToViewController(theImage: UIImage)
}
class ViewController: UIViewController, ImageViewProtocol {
func sendImageToViewController(theImage: UIImage) {
imageView.image = theImage
}
#IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let viewcontroller2 = storyboard?.instantiateViewController(withIdentifier: "viewcontroller2") as! ViewController2
viewcontroller2.delegate = self
self.navigationController?.pushViewController(viewcontroller2, animated: true)
}
}
Try this in ViewController2:
import UIKit
class ViewController2: UIViewController {
var delegate: ImageViewProtocol!
#IBOutlet weak var barcodeImageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
barcodeImageView.image = UIImage(named: "test_image.jpg")
}
#IBAction func saveButtonAction(_ sender: Any) {
delegate.sendImageToViewController(theImage: barcodeImageView.image!)
self.navigationController?.popViewController(animated: true)
}
}