问如何以编程方式记录IOS屏幕

EN

import ReplayKit

@IBAction func toggleRecording(_ sender: UIBarButtonItem) {
    let r = RPScreenRecorder.shared()

    guard r.isAvailable else {
        print("ReplayKit unavailable")
        return
    }
    
    if r.isRecording {
        self.stopRecording(sender, r)
        
    }
    else {
        self.startRecording(sender, r)
    }
}

func startRecording(_ sender: UIBarButtonItem, _ r: RPScreenRecorder) {
    
    r.startRecording(handler: { (error: Error?) -> Void in
        if error == nil { // Recording has started
            sender.title = "Stop"
        } else {
            // Handle error
            print(error?.localizedDescription ?? "Unknown error")
        }
    })
}

func stopRecording(_ sender: UIBarButtonItem, _ r: RPScreenRecorder) {
    r.stopRecording( handler: { previewViewController, error in

        sender.title = "Record"
        
        if let pvc = previewViewController {

            if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.pad {
                pvc.modalPresentationStyle = UIModalPresentationStyle.popover
                pvc.popoverPresentationController?.sourceRect = CGRect.zero
                pvc.popoverPresentationController?.sourceView = self.view
            }

            pvc.previewControllerDelegate = self
            self.present(pvc, animated: true, completion: nil)
        }
        else if let error = error {
            print(error.localizedDescription)
        }
        
    })
}

// MARK: RPPreviewViewControllerDelegate
func previewControllerDidFinish(_ previewController: RPPreviewViewController) {
    previewController.dismiss(animated: true, completion: nil)
}

import UIKit
import AVFoundation
class ViewController: UIViewController {
    let captureSession = AVCaptureSession()
    let stillImageOutput = AVCaptureStillImageOutput()
    var error: NSError?
    override func viewDidLoad() {
        super.viewDidLoad()
        let devices = AVCaptureDevice.devices().filter{ $0.hasMediaType(AVMediaTypeVideo) && $0.position == AVCaptureDevicePosition.Back }
        if let captureDevice = devices.first as? AVCaptureDevice  {

            captureSession.addInput(AVCaptureDeviceInput(device: captureDevice, error: &error))
            captureSession.sessionPreset = AVCaptureSessionPresetPhoto
            captureSession.startRunning()
            stillImageOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
            if captureSession.canAddOutput(stillImageOutput) {
                captureSession.addOutput(stillImageOutput)
            }
            if let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession) {
                previewLayer.bounds = view.bounds
                previewLayer.position = CGPointMake(view.bounds.midX, view.bounds.midY)
                previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
                let cameraPreview = UIView(frame: CGRectMake(0.0, 0.0, view.bounds.size.width, view.bounds.size.height))
                cameraPreview.layer.addSublayer(previewLayer)
                cameraPreview.addGestureRecognizer(UITapGestureRecognizer(target: self, action:"saveToCamera:"))
                view.addSubview(cameraPreview)
            }
        }
    }
    func saveToCamera(sender: UITapGestureRecognizer) {
        if let videoConnection = stillImageOutput.connectionWithMediaType(AVMediaTypeVideo) {
            stillImageOutput.captureStillImageAsynchronouslyFromConnection(videoConnection) {
                (imageDataSampleBuffer, error) -> Void in
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)
                 UIImageWriteToSavedPhotosAlbum(UIImage(data: imageData), nil, nil, nil)
            }
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}