CODEWITHSUNDEEP
swiftuiimageviewuiimagepickercontroller
neena
neena

Reputation: 365

UIImageView is not showing image selected via UIIMagePickerController

I am trying to select an image using the UIImagePickerController . I have the following code in which there is one IBOutlet of UIImageView.

After selecting the image in didFinishPickingMediaWithInfo I get the image in memory but somehow it is not visible in the imageview. I did try to change a static image in didFinishPickingMediaWithInfo for imageview but it didn't show the image either. The code is as below,

class SnapshotViewController: UIViewController,UINavigationControllerDelegate, UIImagePickerControllerDelegate
{
    @IBOutlet var imageView: UIImageView!
    @IBAction func takePhoto(sender: AnyObject) {
      let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = .PhotoLibrary
        imagePicker.allowsEditing = false
        presentViewController(imagePicker, animated: true, completion: nil)
    }


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

        dismissViewControllerAnimated(true, completion: nil)
        dispatch_async(dispatch_get_main_queue())
        {
            let image = info[UIImagePickerControllerOriginalImage] as? UIImage
            self.imageView.image = image
        }
    }
}

I guess this is general problem that whatever image i am changing for this imageView in didFinishPickingMediaWithInfo is not working. If i change the imageView image in viewDidLoad then it works. Can anyone please help as i need to show the image selected via photo library?

Upvotes: 0

Views: 1435

Answers (3)

Blasanka
Blasanka

Reputation: 22477

In swift 4, I tried various things but non of them work until I just add @objc annotation to didFinishPickingMediaWithInfo override method:

Pressenting UIImagePickerController:

@objc func handleSelectProfileImageView () {
        let pickerController = UIImagePickerController()
        pickerController.delegate = self
        present(pickerController, animated: true, completion: nil)
    }

Extension to get media data (in this one I had to add @objc):

extension MyViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    @objc func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: Any]) {
        if let image = info["UIImagePickerControllerOriginalImage"] as? UIImage {
            selectedImage = image
            profileImage.image = image
        }
        dismiss(animated: true, completion: nil)
    }
}

About @objc from doc:

Apply this attribute to any declaration that can be represented in Objective-C—for example, nonnested classes, protocols, nongeneric enumerations (constrained to integer raw-value types), properties and methods (including getters and setters) of classes, protocols and optional members of a protocol, initializers, and subscripts. The objc attribute tells the compiler that a declaration is available to use in Objective-C code.

Upvotes: 0

Øystein Vaagen
Øystein Vaagen

Reputation: 31

I think this code would solve your problem and make the picture from your photolibrary appear:

class PostViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {



    @IBOutlet var imageToPost: UIImageView!

    @IBAction func chooseAnImage(_ sender: AnyObject) {

        let imagePicker = UIImagePickerController()

        imagePicker.delegate = self

        imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary

        imagePicker.allowsEditing = false

        self.present(imagePicker, animated: true, completion: nil)

    }

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

        if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {

            imageToPost.image = image


        }

        self.dismiss(animated: true, completion: nil)

    }

Upvotes: 0

Roel Koops
Roel Koops

Reputation: 880

It is strongly recommended not to update UI controls from a background thread. This can be the cause of strange behaviour and crashes which are sometimes very hard to identify.

Try to set the image on the main thread instead:

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

    let image = info[UIImagePickerControllerOriginalImage] as? UIImage
    self.imageView.image = image

    dismissViewControllerAnimated(true, completion: nil)
}

Upvotes: 0

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