Swift 3 - Unable to pass image from one viewcontroller to second

Question

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

https://stackoverflow.com/questions/31576232/passing-image-to-another-view-controller-swift, and verify data in not nil.You can use if-let to handle nil values. — Tushar Sharma, Nov 10 '17 at 10:56
Check is your segue in storyboard named "selected" and the type of destination view controller (by your code it's "secondVC"). It could be because vc is nil. — Eridana, Nov 10 '17 at 10:56
@Eridana yess i have checked segue named and second vc's name — Yash R, Nov 10 '17 at 11:06

score 0 · Accepted Answer · answered Nov 10 '17 at 10:58

0

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

answered Nov 10 '17 at 10:58

Abhishek Jain

826
8
20

cannot understand – Yash R Nov 10 '17 at 11:12
Just do a nil check before you assign it to your secondvc in this line `vc.img.image = self.imgg.image' – Abhishek Jain Nov 10 '17 at 17:46

score 0 · Answer 2 · answered Nov 10 '17 at 11:20

0

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
}

answered Nov 10 '17 at 11:20

Priya

735
5
10

it doesn't work – Yash R Nov 10 '17 at 11:49
Are you getting same exception after implementing this? – Priya Nov 10 '17 at 11:57
image does not showing on second vc – Yash R Nov 10 '17 at 11:58
Can you upload your code somewhere so that code can be debug? – Priya Nov 10 '17 at 11:59
i can send u code – Yash R Nov 10 '17 at 12:03
Please upload your code on Github or Dropbox and send link – Priya Nov 10 '17 at 12:05

Swift 3 - Unable to pass image from one viewcontroller to second

2 Answers2