AVCapturePhotoOutput has no member 'captureStillImageAsynchronously' - ios

Question

I am making a custom camera app in which i can i capture my photos by takePhoto button, but there is an error in takePhoto saying AVCapturePhotoOutput has no member 'captureStillImageAsynchronously'.
ViewController
import UIKit
import AVFoundation
import CoreImage
#available(iOS 10.0, *)
class ViewController: UIViewController {
var captureSession = AVCaptureSession()
var sessionOutput = AVCapturePhotoOutput()
var previewLayer = AVCaptureVideoPreviewLayer()
#IBOutlet weak var imageViewReal: UIImageView!
#IBOutlet weak var cameraView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let deviceSession = AVCaptureDeviceDiscoverySession.init(deviceTypes: [.builtInDuoCamera, .builtInTelephotoCamera, .builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: .unspecified)
for device in (deviceSession?.devices)! {
if (device as AnyObject).position == AVCaptureDevicePosition.front {
do {
let input = try AVCaptureDeviceInput(device: device )
if captureSession.canAddInput(input) {
captureSession.addInput(input)
if captureSession.canAddOutput(sessionOutput){
captureSession.addOutput(sessionOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
previewLayer.connection.videoOrientation = .portrait
cameraView.layer.addSublayer(previewLayer)
cameraView.addSubview(takePhoto)
previewLayer.position = CGPoint (x: self.imageViewReal.frame.width / 2, y: self.imageViewReal.frame.height / 2 )
previewLayer.bounds = imageViewReal.frame
captureSession.startRunning()
}
}
}
catch {
print("Error")
}
}
}
}
#IBAction func takePhoto(_ sender: Any) {
if let videoConnection = sessionOutput.connection(withMediaType: AVMediaTypeVideo) {
sessionOutput.captureStillImageAsynchronously(from: videoConnection, completionHandler: {
buffer, Error in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
UIImageWriteToSavedPhotosAlbum(UIImage(data : imageData!)!, nil, nil, nil)
})
}
}
}

Answer 1

If your app is compatible with iOS9, use AVCaptureStillImageOutput's method:
func captureStillImageAsynchronously(from connection: AVCaptureConnection!,
completionHandler handler: ((CMSampleBuffer?, Error?) -> Void)!)
If your app begins from iOS10, you should use AVCapturePhotoOutput's method:
open func capturePhoto(with settings: AVCapturePhotoSettings, delegate: AVCapturePhotoCaptureDelegate)
So,var sessionOutput = AVCapturePhotoOutput() should be var sessionOutput = AVCaptureStillImageOutput().
Have a nice try.