UIView相机不保存照片边框

Question

下面的代码是一个用作相机的UIView。按下按钮（didtakePhoto）时，在UIView周围插入边框。但是，边框未保存到照片中。该按钮会自动将照片保存到照片库，而不会在照片中插入边框。我想要的只是将sa.layer.addBorder添加到已保存的照片中。

我的代码

import UIKit
import AVFoundation

class ViewController: UIViewController,AVCapturePhotoCaptureDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextFieldDelegate  {


var captureSesssion : AVCaptureSession!
var cameraOutput : AVCapturePhotoOutput!
var previewLayer : AVCaptureVideoPreviewLayer!

@IBOutlet var sa: UIView!


override func viewDidLoad() {
    super.viewDidLoad()


    captureSesssion = AVCaptureSession()
    captureSesssion.sessionPreset = AVCaptureSessionPresetPhoto
    cameraOutput = AVCapturePhotoOutput()

    let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)

    if let input = try? AVCaptureDeviceInput(device: device) {
        if (captureSesssion.canAddInput(input)) {
            captureSesssion.addInput(input)
            if (captureSesssion.canAddOutput(cameraOutput)) {
                captureSesssion.addOutput(cameraOutput)
                previewLayer = AVCaptureVideoPreviewLayer(session: captureSesssion)

                //previewLayer.frame = sa.bounds

                previewLayer.frame = CGRect(x: 10, y: 10, width: 700, height: 700)

                sa.layer.addSublayer(previewLayer)

                captureSesssion.startRunning()
            }}}}

@IBAction func didPressTakePhoto(_ sender: UIButton) {

    sa.layer.addBorder(edge: [.top], color: UIColor.red, thickness: 12.0)
    sa.layer.addBorder(edge: [.bottom], color: UIColor.red, thickness: 180.0)
    sa.layer.addBorder(edge: [.left], color: UIColor.red, thickness: 100.0)
    sa.layer.addBorder(edge: [.right], color: UIColor.red, thickness: 50.0)



          let settings = AVCapturePhotoSettings()
    let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
    let previewFormat = [
        kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
        kCVPixelBufferWidthKey as String: 160,
        kCVPixelBufferHeightKey as String: 160
    ]
    settings.previewPhotoFormat = previewFormat
    cameraOutput.capturePhoto(with: settings, delegate: self)

    }



    func capture(_ captureOutput: AVCapturePhotoOutput,  didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?,  previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings:  AVCaptureResolvedPhotoSettings, bracketSettings:   AVCaptureBracketedStillImageSettings?, error: Error?) {

                 if let error = error {
            print("error occure : \(error.localizedDescription)")
        }

        if  let sampleBuffer = photoSampleBuffer,
            let previewBuffer = previewPhotoSampleBuffer,
            let dataImage =  AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer:  sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
            print(UIImage(data: dataImage)?.size as Any)

            let dataProvider = CGDataProvider(data: dataImage as CFData)
            let cgImageRef: CGImage! = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
            let image = UIImage(cgImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.right)
            UIImageWriteToSavedPhotosAlbum(image, self, #selector(self.imagex(_:didFinishSavingWithError:contextInfo:)), nil)

                      } else {
            print("some error here")
        }}
    func imagex(_ image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: UnsafeRawPointer) {

    }}