UIImagePickerController editing view circle overlay

Question

I\'ve been able to get pretty far with what I\'ve been wanting to accomplish, and that\'s to replicate iOS\'s built in circular photo cropper for the built in contacts app.

Answer 1

Swift 3 version (also with rounded edit layer for pictures taken by camera):

// Insert this code to your view controller
private var editLayer: CAShapeLayer!
private var label: UILabel!


override func viewDidLoad()
{
    super.viewDidLoad()

    // Rounded edit layer
    navigationController?.delegate = self
    NotificationCenter.default.addObserver(self, selector: #selector(pictureCaptured), name: NSNotification.Name(rawValue: "_UIImagePickerControllerUserDidCaptureItem"), object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(pictureRejected), name: NSNotification.Name(rawValue: "_UIImagePickerControllerUserDidRejectItem"), object: nil)
}


@objc private func pictureCaptured()
{
    addRoundedEditLayer(to: ...your UIImagePickerController..., forCamera: true)
}


@objc private func pictureRejected()
{
    editLayer.removeFromSuperlayer()
    label.removeFromSuperview()
}


deinit
{
    NotificationCenter.default.removeObserver(self)
}    



// MARK: Navigation controller delegate

func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool)
{
    // Image picker in edit mode
    if let imageVC = NSClassFromString("PUUIImageViewController")
    {
        if viewController.isKind(of: imageVC) {
            addRoundedEditLayer(to: viewController, forCamera: false)
        }
    }
}


private func addRoundedEditLayer(to viewController: UIViewController, forCamera: Bool)
{
    hideDefaultEditOverlay(view: viewController.view)

    // Circle in edit layer - y position
    let bottomBarHeight: CGFloat = 72.0
    let position = (forCamera) ? viewController.view.center.y - viewController.view.center.x - bottomBarHeight/2 : viewController.view.center.y - viewController.view.center.x

    let viewWidth = viewController.view.frame.width
    let viewHeight = viewController.view.frame.height

    let emptyShapePath = UIBezierPath(ovalIn: CGRect(x: 0, y: position, width: viewWidth, height: viewWidth))
    emptyShapePath.usesEvenOddFillRule = true

    let filledShapePath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: viewWidth, height: viewHeight - bottomBarHeight), cornerRadius: 0)
    filledShapePath.append(emptyShapePath)
    filledShapePath.usesEvenOddFillRule = true

    editLayer = CAShapeLayer()
    editLayer.path = filledShapePath.cgPath
    editLayer.fillRule = kCAFillRuleEvenOdd
    editLayer.fillColor = UIColor.black.cgColor
    editLayer.opacity = 0.5
    viewController.view.layer.addSublayer(editLayer)

    // Move and Scale label
    label = UILabel(frame: CGRect(x: 0, y: 10, width: viewWidth, height: 50))
    label.text = "Move and Scale"
    label.textAlignment = .center
    label.textColor = UIColor.white
    viewController.view.addSubview(label)
}


private func hideDefaultEditOverlay(view: UIView)
{
    for subview in view.subviews
    {
        if let cropOverlay = NSClassFromString("PLCropOverlayCropView")
        {
            if subview.isKind(of: cropOverlay) {
                subview.isHidden = true
                break
            }
            else {
                hideDefaultEditOverlay(view: subview)
            }
        }
    }
}