Clash Royale CLAN TAG#URR8PPP

SwiftyCam capture session is not running

I have created my camera view following the demo project on GitHub from SwiftyCam Everything lays out correctly and is going well; however, when the camera button is pushed I get a message in the console saying "[SwiftyCam]: Cannot take photo. Capture session is not running". There have been other people having this problem with swift 4 and you can find that here. I have gone through the whole framework line by line but for some reason I can't figure it out. I would really appreciate it if someone could look at the framework and the documentation and help me out. The way I'm doing it is just about exactly how it's done in the Swift 4 demo project so that would be the code reference.

Thank you in advance

EDIT: Below is the code when setting up the SwipeNavigationController after the WelcomeVC

let swipeNavigationController = SwipeNavigationController(centerViewController: CameraViewController())

swipeNavigationController.topViewController = BlueView()
swipeNavigationController.bottomViewController = PinkView()
swipeNavigationController.leftViewController = OrangeView()
swipeNavigationController.rightViewController = GreenView()



cameraView.navigationController?.setNavigationBarHidden(true, animated: false)


orangeView.navigationController?.setNavigationBarHidden(false, animated: false)

greenView.navigationController?.setNavigationBarHidden(false, animated: false)





let navController = UINavigationController(rootViewController: swipeNavigationController)

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


Below is all the code in the CameraVC

class CameraViewController: SwiftyCamViewController, SwiftyCamViewControllerDelegate, SwipeNavigationControllerDelegate




let orangeVC = OrangeView()

let greenVC = GreenView()
let blueVC = BlueView()
let pinkVC = PinkView()



let flipCameraButton: UIButton =
let button = UIButton()
let image = UIImage(named: "cameraSwitch")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(cameraSwitchTapped), for: .touchUpInside)

return button
()

let captureButton: SwiftyRecordButton =
let button = SwiftyRecordButton(frame: CGRect(x: 150, y: 572, width: 75, height: 75))
//let image = UIImage(named: "focus")
//button.setImage(image, for: .normal)
//button.addTarget(self, action: #selector(cameraTapped), for: .touchUpInside)




return button
()



let orangeButton: UIButton =
let button = UIButton()
let image = UIImage(named: "OrangeIcon")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(goToOrange), for: .touchUpInside)

return button
()

let greenButton: UIButton =
let button = UIButton()
let image = UIImage(named: "GreenIcon")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(goToGreen), for: .touchUpInside)

return button
()

let pinkButton: UIButton =
let button = UIButton()
let image = UIImage(named: "pinkCameraIcon")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(goToPink), for: .touchUpInside)

return button
()

override func viewDidLoad()
super.viewDidLoad()

view.addSubview(flipCameraButton)
view.addSubview(captureButton)
view.addSubview(orangeButton)
view.addSubview(greenButton)
view.addSubview(pinkButton)

shouldPrompToAppSettings = true
cameraDelegate = self
maximumVideoDuration = 10.0
shouldUseDeviceOrientation = true
allowAutoRotate = true
audioEnabled = true


// disable capture button until session starts
captureButton.buttonEnabled = false

navigationController?.isNavigationBarHidden = true

UIApplication.shared.statusBarStyle = .lightContent
navigationController?.isNavigationBarHidden = true

setupViews()




override func viewWillAppear(_ animated: Bool)
UIApplication.shared.statusBarStyle = .lightContent
navigationController?.isNavigationBarHidden = true



override func viewDidAppear(_ animated: Bool)
super.viewDidAppear(animated)
captureButton.delegate = self




//


@objc func goToOrange()


orangeVC.navigationController?.setNavigationBarHidden(false, animated: true)

self.containerSwipeNavigationController?.showEmbeddedView(position: .left)


@objc func goToGreen()


greenVC.navigationController?.setNavigationBarHidden(false, animated: true)

self.containerSwipeNavigationController?.showEmbeddedView(position: .right)




@objc func goToPink()


self.containerSwipeNavigationController?.showEmbeddedView(position: .bottom)


@objc func cameraSwitchTapped()
switchCamera()


@objc func cameraTapped()
print("CAMERA TAPPED")

takePhoto()





func setupViews()

flipCameraButton.anchor(top: view.topAnchor, left: nil, bottom: nil, right: view.rightAnchor, paddingTop: 25, paddingLeft: 0, paddingBottom: 0, paddingRight: 12, width: 35, height: 35)

captureButton.anchor(top: nil, left: nil, bottom: pinkButton.topAnchor, right: nil, paddingTop: 0, paddingLeft: 0, paddingBottom: 10, paddingRight: 0, width: 75, height: 75)
captureButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true

orangeButton.anchor(top: nil, left: view.leftAnchor, bottom: view.bottomAnchor, right: nil, paddingTop: 0, paddingLeft: 10, paddingBottom: 0, paddingRight: 0, width: 75, height: 75)

greenButton.anchor(top: nil, left: nil, bottom: view.bottomAnchor, right: view.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 10, width: 75, height: 75)

pinkButton.anchor(top: nil, left: nil, bottom: view.bottomAnchor, right: nil, paddingTop: 0, paddingLeft: 0, paddingBottom: -10, paddingRight: 0, width: 75, height: 75)
pinkButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true

view.addSubview(flipCameraButton)
view.addSubview(captureButton)
view.addSubview(orangeButton)
view.addSubview(greenButton)
view.addSubview(pinkButton)




//MARK: Camera Protocols

func swiftyCamSessionDidStartRunning(_ swiftyCam: SwiftyCamViewController)
print("Session did start running")
captureButton.buttonEnabled = true


func swiftyCamSessionDidStopRunning(_ swiftyCam: SwiftyCamViewController)
print("Session did stop running")
captureButton.buttonEnabled = false



func swiftyCam(_ swiftyCam: SwiftyCamViewController, didTake photo: UIImage)
let newVC = AfterPhotoTakenView(image: photo)
self.present(newVC, animated: true, completion: nil)


func swiftyCam(_ swiftyCam: SwiftyCamViewController, didBeginRecordingVideo camera: SwiftyCamViewController.CameraSelection)
print("Did Begin Recording")
captureButton.growButton()
hideButtons()


func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFinishRecordingVideo camera: SwiftyCamViewController.CameraSelection)
print("Did finish Recording")
captureButton.shrinkButton()
showButtons()


func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFinishProcessVideoAt url: URL)
let newVC = VideoView(videoURL: url)
self.present(newVC, animated: true, completion: nil)


func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFocusAtPoint point: CGPoint)
print("Did focus at point: (point)")
focusAnimationAt(point)


func swiftyCamDidFailToConfigure(_ swiftyCam: SwiftyCamViewController)
let message = NSLocalizedString("Unable to capture media", comment: "Alert message when something goes wrong during capture session configuration")
let alertController = UIAlertController(title: "AVCam", message: message, preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Alert OK button"), style: .cancel, handler: nil))
present(alertController, animated: true, completion: nil)


func swiftyCam(_ swiftyCam: SwiftyCamViewController, didChangeZoomLevel zoom: CGFloat)
print("Zoom level did change. Level: (zoom)")
print(zoom)


func swiftyCam(_ swiftyCam: SwiftyCamViewController, didSwitchCameras camera: SwiftyCamViewController.CameraSelection)
print("Camera did change to (camera.rawValue)")
print(camera)


func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFailToRecordVideo error: Error)
print(error)









override var preferredStatusBarStyle: UIStatusBarStyle
return .lightContent








extension CameraViewController

fileprivate func hideButtons()
UIView.animate(withDuration: 0.25)

self.flipCameraButton.alpha = 0.0



fileprivate func showButtons()
UIView.animate(withDuration: 0.25)

self.flipCameraButton.alpha = 1.0



fileprivate func focusAnimationAt(_ point: CGPoint)
let focusView = UIImageView(image: #imageLiteral(resourceName: "focus"))
focusView.center = point
focusView.alpha = 0.0
view.addSubview(focusView)

UIView.animate(withDuration: 0.25, delay: 0.0, options: .curveEaseInOut, animations:
focusView.alpha = 1.0
focusView.transform = CGAffineTransform(scaleX: 1.25, y: 1.25)
) (success) in
UIView.animate(withDuration: 0.15, delay: 0.5, options: .curveEaseInOut, animations:
focusView.alpha = 0.0
focusView.transform = CGAffineTransform(translationX: 0.6, y: 0.6)
) (success) in
focusView.removeFromSuperview()




fileprivate func toggleFlashAnimation()
if flashEnabled == true
//flashButton.setImage(#imageLiteral(resourceName: "flash"), for: UIControlState())
else
//flashButton.setImage(#imageLiteral(resourceName: "flashOutline"), for: UIControlState())





This is what it looks like when a user swipes to another view, as well as the buttons aren't responsive and the user can't swipe up or down for those views either.

Here is an example of a view I'm trying to present when the user swipes from left to right or clicks the pink messages button.

class MessagesView: UITableViewController

override func viewDidLoad()
super.viewDidLoad()


view.backgroundColor = UIColor.white

setupNavBar()

navigationController?.isNavigationBarHidden = false

if #available(iOS 11.0, *)
navigationController?.navigationBar.prefersLargeTitles = true
self.navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
else
// Fallback on earlier versions





override func viewWillAppear(_ animated: Bool)

if #available(iOS 11.0, *)
navigationController?.navigationBar.prefersLargeTitles = true
self.navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
setupNavBar()
else
setupNavBar()



func setupNavBar()
UIApplication.shared.statusBarStyle = .lightContent
self.navigationController?.isNavigationBarHidden = false
self.navigationController?.navigationBar.topItem?.title = "Messages"
self.navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
self.navigationController?.navigationBar.barTintColor = UIColor.pinkNeonColor
self.navigationController?.navigationBar.tintColor = UIColor.white



1 Answer
1

public enum Position
case center
case top
case bottom
case left
case right


enum ActivePanDirection
case undefined
case horizontal
case vertical



public protocol SwipeNavigationControllerDelegate: class

func swipeNavigationController(_ controller: SwipeNavigationController, willShowEmbeddedViewForPosition position: Position)

func swipeNavigationController(_ controller: SwipeNavigationController, didShowEmbeddedViewForPosition position: Position)


open class SwipeNavigationController: SwiftyCamViewController, SwiftyCamViewControllerDelegate

@IBOutlet fileprivate var currentXOffset: NSLayoutConstraint!
@IBOutlet fileprivate var currentYOffset: NSLayoutConstraint!

open fileprivate(set) weak var activeViewController: UIViewController!

public weak var delegate: SwipeNavigationControllerDelegate?

open fileprivate(set) var centerViewController: UIViewController!

open var topViewController: UIViewController?
willSet(newValue)
self.shouldShowTopViewController = newValue != nil
guard let viewController = newValue else

return

addEmbeddedViewController(viewController, previousViewController: topViewController, position: .top)


open var bottomViewController: UIViewController?
willSet(newValue)
self.shouldShowBottomViewController = newValue != nil
guard let viewController = newValue else
return

addEmbeddedViewController(viewController, previousViewController: bottomViewController, position: .bottom)


open var leftViewController: UIViewController?
willSet(newValue)
self.shouldShowLeftViewController = newValue != nil
guard let viewController = newValue else
return

addEmbeddedViewController(viewController, previousViewController: leftViewController, position: .left)


open var rightViewController: UIViewController?
willSet(newValue)
self.shouldShowRightViewController = newValue != nil
guard let viewController = newValue else
return

addEmbeddedViewController(viewController, previousViewController: rightViewController, position: .right)



open override var shouldAutomaticallyForwardAppearanceMethods: Bool
get
return false



@IBOutlet fileprivate var mainPanGesture: UIPanGestureRecognizer!
fileprivate var previousNonZeroDirectionChange = CGVector(dx: 0.0, dy: 0.0)
fileprivate var activePanDirection = ActivePanDirection.undefined
fileprivate let verticalSnapThresholdFraction: CGFloat = 0.15
fileprivate let horizontalSnapThresholdFraction: CGFloat = 0.15

fileprivate var centerContainerOffset: CGVector!
fileprivate var topContainerOffset: CGVector!
fileprivate var bottomContainerOffset: CGVector!
fileprivate var leftContainerOffset: CGVector!
fileprivate var rightContainerOffset: CGVector!

open var shouldShowTopViewController = true
open var shouldShowBottomViewController = true
open var shouldShowLeftViewController = true
open var shouldShowRightViewController = true
open var shouldShowCenterViewController = true

fileprivate let swipeAnimateDuration = 0.2

public init(centerViewController: UIViewController)
super.init(nibName: nil, bundle: nil)
shouldShowTopViewController = false
shouldShowBottomViewController = false
shouldShowLeftViewController = false
shouldShowRightViewController = false
self.centerViewController = centerViewController
addChildViewController(centerViewController)
centerViewController.didMove(toParentViewController: self)



public func swiftyCamSessionDidStartRunning(_ swiftyCam: SwiftyCamViewController)
print("Session did start running")
captureButton.buttonEnabled = true


public func swiftyCamSessionDidStopRunning(_ swiftyCam: SwiftyCamViewController)
print("Session did stop running")
captureButton.buttonEnabled = false


public func swiftyCam(_ swiftyCam: SwiftyCamViewController, didTake photo: UIImage)
let newVC = PhotoViewController(image: photo)
self.present(newVC, animated: true, completion: nil)


public func swiftyCam(_ swiftyCam: SwiftyCamViewController, didBeginRecordingVideo camera: SwiftyCamViewController.CameraSelection)
print("Did Begin Recording")
captureButton.growButton()
hideButtons()


public func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFinishRecordingVideo camera: SwiftyCamViewController.CameraSelection)
print("Did finish Recording")
captureButton.shrinkButton()
showButtons()


public func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFinishProcessVideoAt url: URL)
let newVC = VideoViewController(videoURL: url)
self.present(newVC, animated: true, completion: nil)


public func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFocusAtPoint point: CGPoint)
print("Did focus at point: (point)")
focusAnimationAt(point)


public func swiftyCamDidFailToConfigure(_ swiftyCam: SwiftyCamViewController)
let message = NSLocalizedString("Unable to capture media", comment: "Alert message when something goes wrong during capture session configuration")
let alertController = UIAlertController(title: "AVCam", message: message, preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Alert OK button"), style: .cancel, handler: nil))
present(alertController, animated: true, completion: nil)


public func swiftyCam(_ swiftyCam: SwiftyCamViewController, didChangeZoomLevel zoom: CGFloat)
print("Zoom level did change. Level: (zoom)")
print(zoom)


public func swiftyCam(_ swiftyCam: SwiftyCamViewController, didSwitchCameras camera: SwiftyCamViewController.CameraSelection)
print("Camera did change to (camera.rawValue)")
print(camera)


public func swiftyCam(_ swiftyCam: SwiftyCamViewController, didFailToRecordVideo error: Error)
print(error)

public required init?(coder aDecoder: NSCoder)
super.init(coder: aDecoder)


let flipCameraButton: UIButton =
let button = UIButton()
let image = UIImage(named: "cameraSwitch")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(cameraSwitchTapped), for: .touchUpInside)

return button
()

let captureButton: SwiftyRecordButton =
let button = SwiftyRecordButton(frame: CGRect(x: 150, y: 572, width: 75, height: 75))
let image = UIImage(named: "focus")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(cameraTapped), for: .touchUpInside)
return button
()

let orangeButton: UIButton =
let button = UIButton()
let image = UIImage(named: "OrangeIcon")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(goToOrange), for: .touchUpInside)

return button
()

let greenButton: UIButton =
let button = UIButton()
let image = UIImage(named: "GreenIcon")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(goToGreen), for: .touchUpInside)

return button
()

let pinkButton: UIButton =
let button = UIButton()
let image = UIImage(named: "pinkCameraIcon")
button.setImage(image, for: .normal)
button.addTarget(self, action: #selector(goToPink), for: .touchUpInside)

return button
()

@objc func goToOrange()
//orangeVC.navigationController?.setNavigationBarHidden(false, animated: true)
self.containerSwipeNavigationController?.showEmbeddedView(position: .left)


@objc func goToGreen()
//greenVC.navigationController?.setNavigationBarHidden(false, animated: true)
self.containerSwipeNavigationController?.showEmbeddedView(position: .right)


@objc func goToPink()
self.containerSwipeNavigationController?.showEmbeddedView(position: .bottom)


@objc func cameraSwitchTapped()
switchCamera()


@objc func cameraTapped()
print("CAMERA TAPPED")

takePhoto()


// Mark: - Functions
open override func viewDidLoad()
super.viewDidLoad()
self.cameraDelegate = self

if currentXOffset == nil && currentYOffset == nil
view.addSubview(centerViewController.view)
centerViewController.view.isHidden = true
centerViewController.view.translatesAutoresizingMaskIntoConstraints = false
self.currentXOffset = alignCenterXConstraint(forItem: centerViewController.view, toItem: view, position: .center)
self.currentYOffset = alignCenterYConstraint(forItem: centerViewController.view, toItem: view, position: .center)
view.addConstraints([self.currentXOffset, self.currentYOffset])
view.addConstraints(sizeConstraints(forItem: centerViewController.view, toItem: view))


testViewdid()
assert(currentXOffset != nil && currentYOffset != nil, "both currentXOffset and currentYOffset must be set")

if mainPanGesture == nil
mainPanGesture = UIPanGestureRecognizer(target: self, action: #selector(onPanGestureTriggered(sender:)))
view.addGestureRecognizer(mainPanGesture)



let frameWidth = view.frame.size.width
let frameHeight = view.frame.size.height
centerContainerOffset = CGVector(dx: currentXOffset.constant, dy: currentYOffset.constant)
topContainerOffset = CGVector(dx: centerContainerOffset.dx, dy: centerContainerOffset.dy + frameHeight)
bottomContainerOffset = CGVector(dx: centerContainerOffset.dx, dy: centerContainerOffset.dy - frameHeight)
leftContainerOffset = CGVector(dx: centerContainerOffset.dx + frameWidth, dy: centerContainerOffset.dy)
rightContainerOffset = CGVector(dx: centerContainerOffset.dx - frameWidth, dy: centerContainerOffset.dy)
activeViewController = centerViewController


open override func viewWillAppear(_ animated: Bool)
super.viewWillAppear(animated)
activeViewController.beginAppearanceTransition(true, animated: animated)



open override func viewDidAppear(_ animated: Bool)
super.viewDidAppear(animated)
activeViewController.endAppearanceTransition()
captureButton.delegate = self



open override func viewWillDisappear(_ animated: Bool)
super.viewWillDisappear(animated)
activeViewController.beginAppearanceTransition(false, animated: animated)


open override func viewDidDisappear(_ animated: Bool)
super.viewDidDisappear(animated)
activeViewController.endAppearanceTransition()


func testViewdid()
view.addSubview(flipCameraButton)
view.addSubview(captureButton)
view.addSubview(orangeButton)
view.addSubview(greenButton)
view.addSubview(pinkButton)

shouldPrompToAppSettings = true
cameraDelegate = self
maximumVideoDuration = 10.0
shouldUseDeviceOrientation = true
allowAutoRotate = true
audioEnabled = true
captureButton.buttonEnabled = true

navigationController?.isNavigationBarHidden = true

UIApplication.shared.statusBarStyle = .lightContent
navigationController?.isNavigationBarHidden = true

//setupViews()


// Let UIKit handle rotation forwarding calls
open override func shouldAutomaticallyForwardRotationMethods() -> Bool
return true


// MARK: - Containers
open func showEmbeddedView(position: Position)
weak var disappearingViewController: UIViewController?
let targetOffset: CGVector

switch position
case .center:

if !activeViewController.isEqual(centerViewController)
disappearingViewController = activeViewController

activeViewController = centerViewController
targetOffset = centerContainerOffset
case .top:
activeViewController = topViewController
targetOffset = topContainerOffset
case .bottom:
activeViewController = bottomViewController
targetOffset = bottomContainerOffset
case .left:
activeViewController = leftViewController
targetOffset = leftContainerOffset
case .right:
activeViewController = rightViewController
targetOffset = rightContainerOffset


if !activeViewController.isEqual(centerViewController)
disappearingViewController = centerViewController


currentXOffset.constant = targetOffset.dx
currentYOffset.constant = targetOffset.dy
disappearingViewController?.beginAppearanceTransition(false, animated: true)
activeViewController.beginAppearanceTransition(true, animated: true)
delegate?.swipeNavigationController(self, willShowEmbeddedViewForPosition: position)
UIView.animate(withDuration: swipeAnimateDuration, animations:
self.view.layoutIfNeeded()
) (finished) in
self.delegate?.swipeNavigationController(self, didShowEmbeddedViewForPosition: position)
self.activeViewController.endAppearanceTransition()
disappearingViewController?.endAppearanceTransition()



open func isContainerActive(position: Position) -> Bool
let targetOffset: CGVector
switch position
case .center:
targetOffset = centerContainerOffset
case .top:
targetOffset = topContainerOffset
case .bottom:
targetOffset = bottomContainerOffset
case .left:
targetOffset = leftContainerOffset
case .right:
targetOffset = rightContainerOffset

return (currentXOffset.constant, currentYOffset.constant) == (targetOffset.dx, targetOffset.dy)



open func lock()
self.mainPanGesture.isEnabled = false

open func unlock()
self.mainPanGesture.isEnabled = true


func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool
return true


@IBAction fileprivate func onPanGestureTriggered(sender: UIPanGestureRecognizer)
switch sender.state isContainerActive(position: .right)
activePanDirection = .horizontal
else
activePanDirection = .undefined


case .changed:

let translationInMainView = sender.translation(in: view)

if translationInMainView.x != 0
previousNonZeroDirectionChange.dx = translationInMainView.x


if translationInMainView.y != 0
previousNonZeroDirectionChange.dy = translationInMainView.y


switch activePanDirection

// reset translation for next iteration
sender.setTranslation(CGPoint.zero, in: view)

case .ended:
/*
* Handle snapping here
*/
switch activePanDirection
case .horizontal:

if currentXOffset.constant > 0.0

// within range of center container
if currentXOffset.constant < (horizontalSnapThresholdFraction * view.frame.size.width)
showEmbeddedView(position: .center)


// within range of left container
else if currentXOffset.constant > ((1.0 - horizontalSnapThresholdFraction) * view.frame.size.width)
showEmbeddedView(position: .left)


// center region: depends on inertia direction
else
// pulled right
if previousNonZeroDirectionChange.dx > 0.0
showEmbeddedView(position: .left)


// pulled left
else
showEmbeddedView(position: .center)




else if currentXOffset.constant < 0.0

// within range of center container
if currentXOffset.constant > (horizontalSnapThresholdFraction * -view.frame.size.width)
showEmbeddedView(position: .center)


// within range of right container
else if currentXOffset.constant < ((1.0 - horizontalSnapThresholdFraction) * -view.frame.size.width)
showEmbeddedView(position: .right)


// center region: depends on inertia direction
else
// pulled left
if previousNonZeroDirectionChange.dx < 0.0
showEmbeddedView(position: .right)


// pulled right
else
showEmbeddedView(position: .center)




case .vertical:
if currentYOffset.constant > 0.0

if currentYOffset.constant < (verticalSnapThresholdFraction * view.frame.size.height)
showEmbeddedView(position: .center)


else if currentYOffset.constant > ((1.0 - verticalSnapThresholdFraction) * view.frame.size.height)
showEmbeddedView(position: .top)

else

if previousNonZeroDirectionChange.dy > 0.0
showEmbeddedView(position: .top)


else
showEmbeddedView(position: .center)




else if currentYOffset.constant < 0.0

if currentYOffset.constant > (verticalSnapThresholdFraction * -view.frame.size.height)
showEmbeddedView(position: .center)


else if currentYOffset.constant < ((1.0 - verticalSnapThresholdFraction) * -view.frame.size.height)
showEmbeddedView(position: .bottom)

else

if previousNonZeroDirectionChange.dy < 0.0

showEmbeddedView(position: .bottom)


else
showEmbeddedView(position: .center)




case .undefined:
break

default:
break



func addEmbeddedViewController(_ viewController: UIViewController, previousViewController: UIViewController?, position: Position)
if viewController.isEqual(previousViewController)
return

previousViewController?.beginAppearanceTransition(false, animated: false)
previousViewController?.view.removeFromSuperview()
previousViewController?.endAppearanceTransition()
previousViewController?.willMove(toParentViewController: nil)
previousViewController?.removeFromParentViewController()

addChildViewController(viewController)
view.addSubview(viewController.view)
view.sendSubview(toBack: viewController.view)
viewController.view.translatesAutoresizingMaskIntoConstraints = false
viewController.didMove(toParentViewController: self)
view.addConstraint(alignCenterXConstraint(forItem: viewController.view, toItem: centerViewController.view, position: position))
view.addConstraint(alignCenterYConstraint(forItem: viewController.view, toItem: centerViewController.view, position: position))
view.addConstraints(sizeConstraints(forItem: viewController.view, toItem: centerViewController.view))


func alignCenterXConstraint(forItem item: UIView, toItem: UIView, position: Position) -> NSLayoutConstraint
let offset = position == .left ? -self.view.frame.width : position == .right ? toItem.frame.width : 0
return NSLayoutConstraint(item: item, attribute: .centerX, relatedBy: .equal, toItem: toItem, attribute: .centerX, multiplier: 1, constant: offset)


func alignCenterYConstraint(forItem item: UIView, toItem: UIView, position: Position) -> NSLayoutConstraint
let offset = position == .top ? -self.view.frame.height : position == .bottom ? toItem.frame.height : 0
return NSLayoutConstraint(item: item, attribute: .centerY, relatedBy: .equal, toItem: toItem, attribute: .centerY, multiplier: 1, constant: offset)


func sizeConstraints(forItem item: UIView, toItem: UIView) -> [NSLayoutConstraint]
let widthConstraint = NSLayoutConstraint(item: item, attribute: .width, relatedBy: .equal, toItem: toItem, attribute: .width, multiplier: 1, constant: 0)
let heightConstraint = NSLayoutConstraint(item: item, attribute: .height, relatedBy: .equal, toItem: toItem, attribute: .height, multiplier: 1, constant: 0)
return [widthConstraint, heightConstraint]

func hideButtons()
UIView.animate(withDuration: 0.25)

self.flipCameraButton.alpha = 0.0



func showButtons()
UIView.animate(withDuration: 0.25)

self.flipCameraButton.alpha = 1.0



func focusAnimationAt(_ point: CGPoint)
let focusView = UIImageView(image: #imageLiteral(resourceName: "focus"))
focusView.center = point
focusView.alpha = 0.0
view.addSubview(focusView)

UIView.animate(withDuration: 0.25, delay: 0.0, options: .curveEaseInOut, animations:
focusView.alpha = 1.0
focusView.transform = CGAffineTransform(scaleX: 1.25, y: 1.25)
) (success) in
UIView.animate(withDuration: 0.15, delay: 0.5, options: .curveEaseInOut, animations:
focusView.alpha = 0.0
focusView.transform = CGAffineTransform(translationX: 0.6, y: 0.6)
) (success) in
focusView.removeFromSuperview()




func toggleFlashAnimation()
if flashEnabled == true
//flashButton.setImage(#imageLiteral(resourceName: "flash"), for: UIControlState())
else
//flashButton.setImage(#imageLiteral(resourceName: "flashOutline"), for: UIControlState())





CameraViewControler -

class CameraViewController: UIViewController
override func viewDidLoad()
super.viewDidLoad()

override func viewWillAppear(_ animated: Bool)
UIApplication.shared.statusBarStyle = .lightContent
navigationController?.isNavigationBarHidden = true





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