Fix a warning: [Camera] Attempted to change to mode Portrait with an unsupported device (BackDual)

Question

I have a UICollectionView with a CameraCell in it as a first cell, it displays a camera preview.

I want to fix a warning in XCode console on iOS 16, iPhone XS Max with dual rear camera:

[Camera] Attempted to change to mode Portrait with an unsupported device (BackDual). Auto device for both positions unsupported, returning Auto device for same position anyway (BackAuto).

It appears after UICollectionViewCell with camera preview is displayed on a screen (not when CameraCell is created). I tried to subclass UIImagePickerController and prevent any orientation changes - didn't help.

My CameraCell code:

final class CameraCell: UICollectionViewCell {
    static var reuseIdentifier: String {
        String(describing: CameraCell.self)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)

        setupView()
        NSLogIfDebug("[CameraCell] Init")
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    deinit {
        NSLogIfDebug("[CameraCell] Deinit")
    }

    private lazy var imagePickerController: UIImagePickerController = {
        let imgPicker = UIImagePickerController()
        imgPicker.delegate = self
        imgPicker.sourceType = .camera
        imgPicker.cameraDevice = .rear
        imgPicker.allowsEditing = false
        imgPicker.showsCameraControls = false
        imgPicker.cameraViewTransform = Constants.cameraViewTransform

        return imgPicker
    }()

    private lazy var cameraContainerView: UIView = {
        let view = UIView(frame: .zero)
        view.clipsToBounds = true
        view.translatesAutoresizingMaskIntoConstraints = false
        view.isUserInteractionEnabled = true

        return view
    }()

    private lazy var cameraView: UIView = {
        // Used to return a dummy view on iPhone Simulator
        let isCameraDeviceAvailable = UIImagePickerController.isCameraDeviceAvailable(UIImagePickerController.CameraDevice.rear)

        guard isCameraDeviceAvailable, let view = imagePickerController.view else {
            let dummyView = UIView(frame: .zero)
            dummyView.translatesAutoresizingMaskIntoConstraints = false
            return dummyView
        }
        
        view.frame = .zero
        view.translatesAutoresizingMaskIntoConstraints = false

        return view
    }()

    private lazy var cameraImageView: UIImageView = {
        let imageView = UIImageView(frame: .zero)
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.contentMode = .center
        imageView.clipsToBounds = true
        imageView.image = Constants.cameraImage
        imageView.backgroundColor = .surface8Color.withAlphaComponent(Constants.cameraImageViewAlpha)
        imageView.isUserInteractionEnabled = true

        return imageView
    }()
}

// MARK: - Private

private extension CameraCell {
    enum Constants {
        static let cameraImageViewAlpha = 0.4 as CGFloat
        static let cameraImage = UIImage(named: "photo-camera")
        static let cameraViewTransform = CGAffineTransform(scaleX: 2.0, y: 2.0)
    }

    func setupView() {
        setupCameraContainerView()
    }

    func setupCameraContainerView() {
        addSubview(cameraContainerView)

        addConstraints([
            cameraContainerView.leadingAnchor.constraint(equalTo: leadingAnchor),
            cameraContainerView.trailingAnchor.constraint(equalTo: trailingAnchor),
            cameraContainerView.topAnchor.constraint(equalTo: topAnchor),
            cameraContainerView.bottomAnchor.constraint(equalTo: bottomAnchor)
        ])

        setupCameraView()
        setupCameraImageView()
    }

    func setupCameraView() {
        cameraContainerView.addSubview(cameraView)

        addConstraints([
            cameraView.leadingAnchor.constraint(equalTo: cameraContainerView.leadingAnchor),
            cameraView.trailingAnchor.constraint(equalTo: cameraContainerView.trailingAnchor),
            cameraView.topAnchor.constraint(equalTo: cameraContainerView.topAnchor),
            cameraView.bottomAnchor.constraint(equalTo: cameraContainerView.bottomAnchor)
        ])
    }

    func setupCameraImageView() {
        cameraContainerView.addSubview(cameraImageView)

        addConstraints([
            cameraImageView.leadingAnchor.constraint(equalTo: cameraContainerView.leadingAnchor),
            cameraImageView.trailingAnchor.constraint(equalTo: cameraContainerView.trailingAnchor),
            cameraImageView.topAnchor.constraint(equalTo: cameraContainerView.topAnchor),
            cameraImageView.bottomAnchor.constraint(equalTo: cameraContainerView.bottomAnchor)
        ])
    }
}

// MARK: - UIImagePickerControllerDelegate

extension CameraCell: UIImagePickerControllerDelegate {}

// MARK: - UINavigationControllerDelegate

extension CameraCell: UINavigationControllerDelegate {}

Fix a warning: [Camera] Attempted to change to mode Portrait with an unsupported device (BackDual)

Answers (1)

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