Swift 3 - Unable to pass image from one viewcontroller to second [duplicate] - ios

Question

This question already has answers here:
Passing Image to another View Controller (Swift)
(4 answers)
Closed 5 years ago.
i am trying to pass an image from 1st UIViewController to 2nd UIViewControlleler by prepareforSegue
my code :-
extension ViewController:UIImagePickerControllerDelegate,UINavigationControllerDelegate {
func handleImg() {
let picker = UIImagePickerController()
picker.delegate = self
picker.allowsEditing = true
present(picker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
var selectedImageFromPicer : UIImage?
if let editedImage = info["UIImagePickerControllerEditedImage"] as? UIImage {
selectedImageFromPicer = editedImage
} else if let originalImage = info["UIImagePickerControllerOriginalImage"] as? UIImage {
selectedImageFromPicer = originalImage
}
if let selectedImage = selectedImageFromPicer {
imgg.image = selectedImage
}
guard let imageUrl = info["UIImagePickerControllerImageURL"] as? URL else {
return
}
self.performSegue(withIdentifier: "selected", sender: self)
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
print("canceled picker")
dismiss(animated: true, completion: nil)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "selected" {
let vc = segue.destination as! secondVC
vc.img.image = self.imgg.image
}
}
i am getting the error on line vc.img.image = self.imgg.image
Error
fatal error: unexpectedly found nil while unwrapping an Optional value

Answer 1

You are getting that error because of self.imgg.image is nil. So you are only setting imgg when it is not empty like this:
if let selectedImage = selectedImageFromPicer {
imgg.image = selectedImage
}
but what if this code is never run, then it will throw an error that unexpectedly found nil.
So when you are setting it for second VC, first check if it is not null and then set it like this:
vc.img.image = self.imgg.image

Answer 2

Create variable in secondVC of type UIImage and from your first viewcontroller set image in that variable
You are getting this exception because views of secondVC is not yet created in memory.
So in FirstVC apply following changes
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "selected" {
let vc = segue.destination as! secondVC
vc.image = self.imgg.image
}
}
In secondVC apply following changes
Declare var image: UIImage? = nil
And in viewDidLoad() set image to imageView
override func viewDidLoad() {
super.viewDidLoad()
self.img.image = image
}