SOLVED: Day 58: Animation not working when UIImagePickerController sourceType is camera

@AtinAgnihotri

Aug '21

So I've been stuck at the 2nd challenge in UIImagePickerController, i.e., doing a Fade in when an image is imported in InstaFilter app.

I have these two functions,

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        guard let image = info[.editedImage] as? UIImage else { return }
        imageView.alpha = 0
        dismiss(animated: true)

        currentImage = image
        print("S : \(Date())")

        setupForProcessing()
    }

    func setupForProcessing() {
        let beginImage = CIImage(image: currentImage)
        currentFilter.setValue(beginImage, forKey: kCIInputImageKey)

        applyProcessing()

        UIView.animate(withDuration: 1 , delay: 0, options: [.layoutSubviews], animations: {
            self.imageView.alpha = 1
//            self.imageView.layoutIfNeeded()
        }) { fin in
            print("F : \(Date())")
        }
    }

And I added the two prints just to see who much time elasped between setting the alpha to 0 and then back to 1.

This is working fine when I import an image from Photo Library, but not when clicking a picture through camera. Case if point, here is the output when importing image with sourceType == .photoLibrary

S : 2021-08-01 05:11:36 +0000
F : 2021-08-01 05:11:37 +0000

And here's the output with .camera

S : 2021-08-01 05:11:23 +0000
F : 2021-08-01 05:11:23 +0000

I am at my wit's end, and either my google-fu is weaker than I think, or there just isn't much out there on this problem. Any help on this is greatly appreciated!

You can find the repo for this project here: https://github.com/AtinAgnihotri/FilterIt

@AtinAgnihotri

Aug '21

It seems the dismissal of UIImagePicker was disrupting the animations. A simple solve then was to put the code to happen after the dismissal in dismiss method's completion block, like so:

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        guard let image = info[.editedImage] as? UIImage else { return }
        imageView.alpha = 0
        print("Reached Here")
        dismiss(animated: true) { [weak self] in
            self?.currentImage = image
            self?.setupForProcessing()
        }
    }

Hope this helps someone going forward!

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