How to change some function to be compatible for iOS 10 or below for some function in my snapchat like camera view controller - ios

Question

I am making a view controller to make a camera view controller like snapchat camera. my code below is worked perfectly for iOS 11 or above. to be honest, I don't really grasp my code since i just follow along the tutorial for this snapchat like camera view controller
import UIKit
import AVFoundation
import SVProgressHUD
class CameraVC: UIViewController {
#IBOutlet weak var timeLabel: UILabel!
#IBOutlet weak var dateLabel: UILabel!
#IBOutlet weak var cameraButton: DesignableButton!
#IBOutlet weak var retryButton: DesignableButton!
// to receive data from MainMenuVC
var employeeData : Employee?
var checkinData = CheckIn()
var captureSession = AVCaptureSession()
// which camera input do we want to use
var backCamera: AVCaptureDevice?
var frontCamera: AVCaptureDevice?
// to keep track which camera do we use currently
var currentDevice: AVCaptureDevice?
var photoOutput: AVCapturePhotoOutput?
var cameraPreviewLayer: AVCaptureVideoPreviewLayer?
var toggleCameraGestureRecognizer = UISwipeGestureRecognizer()
var zoomInGestureRecognizer = UISwipeGestureRecognizer()
var zoomOutGestureRecognizer = UISwipeGestureRecognizer()
var thereIsAnError : Bool = false {
didSet {
if thereIsAnError {
cameraButton.isHidden = true
cameraButton.isEnabled = false
retryButton.isHidden = false
retryButton.isEnabled = true
} else {
cameraButton.isHidden = false
cameraButton.isEnabled = true
retryButton.isHidden = true
retryButton.isEnabled = false
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
getDateTimeFromServer()
// initial value
thereIsAnError = false
timeLabel.text = ""
dateLabel.text = ""
cameraButton.isEnabled = false
cameraButton.alpha = 0.4
setupCaptureSession()
setupDevice()
setupInputOutput()
setupPreviewLayer()
startRunningCaptureSession()
setGestureRecognizer()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if checkinData.dateTime != nil {
SVProgressHUD.dismiss()
}
}
#IBAction func shutterButtonDidPressed(_ sender: Any) {
// when the button is pressed, we capture the image and set the photoOutput
let settings = AVCapturePhotoSettings()
photoOutput?.capturePhoto(with: settings, delegate: self)
// perform segue is below in the AVCapturePhotoCaptureDelegate
}
#IBAction func retryButtonDidPressed(_ sender: Any) {
if checkinData.dateTime == nil {
getDateTimeFromServer()
}
}
}
extension CameraVC {
// MARK: - Helper Methods
// MARK: - Helper Methods
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "goToCheckinDetail" {
let checkinDetailTVC = segue.destination as! CheckinDetailVC
checkinDetailTVC.dataOfCheckin = checkinData
checkinDetailTVC.dataOfEmployee = employeeData
// to set the navbar back button title in the checkinDetailVC
navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
}
}
func getDateTimeFromServer() {
SVProgressHUD.show(withStatus: "Loading Data")
NetworkingService.getCurrentTimeFromServer { (result) in
switch result {
case .failure:
self.thereIsAnError = true
SVProgressHUD.dismiss()
self.showAlert(alertTitle: "Sorry", alertMessage: "Internet connection issue, please tap the retry button.", actionTitle: "Back")
case .success(let timeFromServer) :
guard let stringDateTimeServer = timeFromServer as? String else {return}
self.checkinData.dateTime = stringDateTimeServer
let dateTimeService = DateTimeService(fromDateTimeString: stringDateTimeServer)
let time = dateTimeService.parsingDateAndTime()?.timeOnly
self.timeLabel.text = "\(time ?? "-")"
self.dateLabel.text = DateTimeService.changeFormat(of: stringDateTimeServer, toFormat: "dd MMM yyyy")
self.cameraButton.isEnabled = true
self.cameraButton.alpha = 1
self.thereIsAnError = false
SVProgressHUD.dismiss()
}
}
}
func setGestureRecognizer() {
// change camera from front to back
toggleCameraGestureRecognizer.direction = .up
toggleCameraGestureRecognizer.addTarget(self, action: #selector(self.switchCamera))
view.addGestureRecognizer(toggleCameraGestureRecognizer)
// Zoom In recognizer
zoomInGestureRecognizer.direction = .right
zoomInGestureRecognizer.addTarget(self, action: #selector(zoomIn))
view.addGestureRecognizer(zoomInGestureRecognizer)
// Zoom Out recognizer
zoomOutGestureRecognizer.direction = .left
zoomOutGestureRecognizer.addTarget(self, action: #selector(zoomOut))
view.addGestureRecognizer(zoomOutGestureRecognizer)
}
func setupCaptureSession() {
// to specify image resolution and quality we want, we set to the highest resolution possible
captureSession.sessionPreset = AVCaptureSession.Preset.photo
}
func setupDevice() {
// to decide whether we use front or back camer
let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)
let devices = deviceDiscoverySession.devices
for device in devices {
if device.position == AVCaptureDevice.Position.back {
backCamera = device
} else if device.position == AVCaptureDevice.Position.front {
frontCamera = device
}
}
// default device
currentDevice = frontCamera
}
func setupInputOutput() {
// after the camera capture that image (input), we generate the image DATA (output)
// put the input and output to capture Session
do {
let captureDeviceInput = try AVCaptureDeviceInput(device: currentDevice!)
captureSession.addInput(captureDeviceInput)
photoOutput = AVCapturePhotoOutput()
photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format: [AVVideoCodecKey: AVVideoCodecType.jpeg])], completionHandler: nil)
captureSession.addOutput(photoOutput!)
} catch {
print(error)
}
}
func setupPreviewLayer() {
// to display image data on the screen
cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
cameraPreviewLayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
cameraPreviewLayer?.frame = self.view.frame
self.view.layer.insertSublayer(cameraPreviewLayer!, at: 0)
}
#objc func switchCamera() {
captureSession.beginConfiguration()
// Change the device based on the current camera
let newDevice = (currentDevice?.position == AVCaptureDevice.Position.back) ? frontCamera : backCamera
// Remove all inputs from the session
for input in captureSession.inputs {
captureSession.removeInput(input as! AVCaptureDeviceInput)
}
// Change to the new input
let cameraInput:AVCaptureDeviceInput
do {
cameraInput = try AVCaptureDeviceInput(device: newDevice!)
} catch {
print(error)
return
}
if captureSession.canAddInput(cameraInput) {
captureSession.addInput(cameraInput)
}
currentDevice = newDevice
captureSession.commitConfiguration()
}
#objc func zoomIn() {
if let zoomFactor = currentDevice?.videoZoomFactor {
if zoomFactor < 5.0 {
let newZoomFactor = min(zoomFactor + 1.0, 5.0)
do {
try currentDevice?.lockForConfiguration()
currentDevice?.ramp(toVideoZoomFactor: newZoomFactor, withRate: 1.0)
currentDevice?.unlockForConfiguration()
} catch {
print(error)
}
}
}
}
#objc func zoomOut() {
if let zoomFactor = currentDevice?.videoZoomFactor {
if zoomFactor > 1.0 {
let newZoomFactor = max(zoomFactor - 1.0, 1.0)
do {
try currentDevice?.lockForConfiguration()
currentDevice?.ramp(toVideoZoomFactor: newZoomFactor, withRate: 1.0)
currentDevice?.unlockForConfiguration()
} catch {
print(error)
}
}
}
}
func startRunningCaptureSession() {
// to start capturing the data
captureSession.startRunning()
}
}
extension CameraVC: AVCapturePhotoCaptureDelegate {
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let imageData = photo.fileDataRepresentation() {
checkinData.photo = UIImage(data: imageData)
performSegue(withIdentifier: "goToCheckinDetail", sender: nil)
}
}
}
but when I set my deployment target to iOS 10.3, I got an error that said some method is only available for iOS 11 or newer.
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let imageData = photo.fileDataRepresentation() {
checkinData.photo = UIImage(data: imageData)
performSegue(withIdentifier: "goToCheckinDetail", sender: nil)
}
}
AVCapturePhoto' is only available on iOS 11.0 or newer
fileDataRepresentation()' is only available on iOS 11.0 or newer
and
func setupInputOutput() {
// after the camera capture that image (input), we generate the image DATA (output)
// put the input and output to capture Session
do {
let captureDeviceInput = try AVCaptureDeviceInput(device: currentDevice!)
captureSession.addInput(captureDeviceInput)
photoOutput = AVCapturePhotoOutput()
photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format: [AVVideoCodecKey: AVVideoCodecType.jpeg])], completionHandler: nil)
captureSession.addOutput(photoOutput!)
} catch {
print(error)
}
}
'jpeg' is only available on iOS 11.0 or newer
Please help me, I need some function that equal to those function for iOS 10 (at least) or below.

Answer 1

Create an AVCapturePhotoOutput object. Use its properties to determine supported capture settings and to enable certain features (for example, whether to capture Live Photos).
fileprivate var photoOutput: AVCapturePhotoOutput!
Create and configure an AVCapturePhotoSettings object to choose
features and settings for a specific capture (for example, whether to enable image stabilization or flash).
photoOutput = AVCapturePhotoOutput()
if self.session.canAddOutput(photoOutput) {
self.session.addOutput(photoOutput)
}
Capture an image by passing your photo settings object to the
capturePhoto(with:delegate:) method along with a delegate object implementing the AVCapturePhotoCaptureDelegate protocol. The photo capture output then calls your delegate to notify you of significant events during the capture process.
queue.async { self.photoOutput.capturePhoto(with: AVCapturePhotoSettings(), delegate: self) }