ImagePagingViewCell

class ImagePagingViewCell : UICollectionViewCell

A custom cell for the ImagePagingCollectionViewController. It present an image in full screen and the background turns black/white when the image is tapped. The user can pinch or double-tap to zoom and then pan around within the zoomed-in view.

Todo

for dark mode, always keep the background black - just hide the nav bar

  • The image to display full screen.

    Declaration

    Swift

    var image: UIImage? { get set }

  • The view controller that gets notified if the cell is tapped.

    Declaration

    Swift

    weak var delegate: PagingViewWasTappedDelegate?

  • The scroll view for zooming and panning.

    Declaration

    Swift

    @IBOutlet
var scrollView: UIScrollView!

  • The image view that holds the image.

    Declaration

    Swift

    @IBOutlet
var imageView: UIImageView!

  • The factor by which the view zooms in when double-tapped.

    Declaration

    Swift

    var zoomFactor: CGFloat

  • A Boolean to track if the view cell has been turned black (or not)

    Todo

    rename to not confuse with iOS 13 Dark Mode

    Declaration

    Swift

    var isInBlackMode: Bool { get set }

  • Undocumented

    Declaration

    Swift

    override init(frame: CGRect)

  • Undocumented

    Declaration

    Swift

    required init?(coder aDecoder: NSCoder)

  • Configure the cell for a new image.

    Todo

    rename this configureFor(image:animated:) instead of having the VC edit the image and it being called indirectly Just a change in API, not actual function or style.

    Declaration

    Swift

    func configureForNewImage(animated: Bool = true)

tap gestures

  • Called when a user double-taps on an image to zoom in or out.

    Todo

    make private

    Declaration

    Swift

    @objc
func doubleTapAction(_ gestureRecognizer: UIGestureRecognizer)

    Parameters

    gestureRecognizer

    The gesture that called the function.

  • Called when a user single-taps on an image. Toggles the dark background and hiding of navigation bar.

    Todo

    make private

    Declaration

    Swift

    @objc
func singleTapAction(_ gestureRecognizer: UIGestureRecognizer)

    Parameters

    gestureRecognizer

    The gesture that called the function.

tap gestures

  • Undocumented

    Declaration

    Swift

    func scrollViewDidZoom(_ scrollView: UIScrollView)

  • Undocumented

    Declaration

    Swift

    func viewForZooming(in scrollView: UIScrollView) -> UIView?

  • Calculates the minimum zoom scale of the scroll view based on the size of the image and view frame.

    Declaration

    Swift

    func setZoomScale()