捕獲視頻：SwiftUI

Question

我想使用 swiftUI 通過后置攝像頭捕捉視頻。 我在視頻錄制上找不到合適的解決方案。 我實現了在視圖打開時自動錄制視頻的代碼但我想在單擊底部按鈕時開始錄制。 有人可以指導我嗎？

 import SwiftUI
    import AVKit
    
    struct RecordingView: View {
        @State private var timer = 5
        @State private var onComplete = false
        @State private var recording = false
        
        var body: some View {
            ZStack {
                VideoRecordingView(timeLeft: $timer, onComplete: $onComplete, recording: $recording)
                VStack {
                    Button(action: {self.recording.toggle()}, label: {
                    ZStack {
                        Circle()
                            .fill(Color.white)
                            .frame(width: 65, height: 65)
                        
                        Circle()
                            .stroke(Color.white,lineWidth: 2)
                            .frame(width: 75, height: 75)
                    }
                })
                    Button(action: {
                        self.timer -= 1
                        print(self.timer)
                    }, label: {
                        Text("Toggle timer")
                    })
                        .foregroundColor(.white)
                        .padding()
                    Button(action: {
                        self.onComplete.toggle()
                    }, label: {
                        Text("Toggle completion")
                    })
                        .foregroundColor(.white)
                        .padding()
                }
            }
        }
        
    }
    
    






  

這是用於記錄視圖

struct VideoRecordingView: UIViewRepresentable {
    
    @Binding var timeLeft: Int
    @Binding var onComplete: Bool
    @Binding var recording: Bool
    func makeUIView(context: UIViewRepresentableContext<VideoRecordingView>) -> PreviewView {
        let recordingView = PreviewView()
        recordingView.onComplete = {
            self.onComplete = true
        }
        
        recordingView.onRecord = { timeLeft, totalShakes in
            self.timeLeft = timeLeft
            self.recording = true
        }
        
        recordingView.onReset = {
            self.recording = false
            self.timeLeft = 30
        }
        return recordingView
    }
    
    func updateUIView(_ uiViewController: PreviewView, context: UIViewRepresentableContext<VideoRecordingView>) {
        
    }
}

extension PreviewView: AVCaptureFileOutputRecordingDelegate{
    func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
        print(outputFileURL.absoluteString)
    }
}

class PreviewView: UIView {
    private var captureSession: AVCaptureSession?
    private var shakeCountDown: Timer?
    let videoFileOutput = AVCaptureMovieFileOutput()
    var recordingDelegate:AVCaptureFileOutputRecordingDelegate!
    var recorded = 0
    var secondsToReachGoal = 30
    
    var onRecord: ((Int, Int)->())?
    var onReset: (() -> ())?
    var onComplete: (() -> ())?
    
    init() {
        super.init(frame: .zero)
        
        var allowedAccess = false
        let blocker = DispatchGroup()
        blocker.enter()
        AVCaptureDevice.requestAccess(for: .video) { flag in
            allowedAccess = flag
            blocker.leave()
        }
        blocker.wait()
        
        if !allowedAccess {
            print("!!! NO ACCESS TO CAMERA")
            return
        }
        
        // setup session
        let session = AVCaptureSession()
        session.beginConfiguration()
        
        let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera,
                                                  for: .video, position: .front)
        guard videoDevice != nil, let videoDeviceInput = try? AVCaptureDeviceInput(device: videoDevice!), session.canAddInput(videoDeviceInput) else {
            print("!!! NO CAMERA DETECTED")
            return
        }
        session.addInput(videoDeviceInput)
        session.commitConfiguration()
        self.captureSession = session
    }
    
    override class var layerClass: AnyClass {
        AVCaptureVideoPreviewLayer.self
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    var videoPreviewLayer: AVCaptureVideoPreviewLayer {
        return layer as! AVCaptureVideoPreviewLayer
    }
    
    override func didMoveToSuperview() {
        super.didMoveToSuperview()
        recordingDelegate = self
        startTimers()
        if nil != self.superview {
            self.videoPreviewLayer.session = self.captureSession
            self.videoPreviewLayer.videoGravity = .resizeAspect
            self.captureSession?.startRunning()
            self.startRecording()
        } else {
            self.captureSession?.stopRunning()
        }
    }
    
    private func onTimerFires(){
        print("🟢 RECORDING \(videoFileOutput.isRecording)")
        secondsToReachGoal -= 1
        recorded += 1
        onRecord?(secondsToReachGoal, recorded)
        
        if(secondsToReachGoal == 0){
            stopRecording()
            shakeCountDown?.invalidate()
            shakeCountDown = nil
            onComplete?()
            videoFileOutput.stopRecording()
        }
    }
    
    func startTimers(){
        if shakeCountDown == nil {
            shakeCountDown = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] (timer) in
                self?.onTimerFires()
            }
        }
    }
    
    func startRecording(){
        captureSession?.addOutput(videoFileOutput)
        
        let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let filePath = documentsURL.appendingPathComponent("tempPZDC")
        
        videoFileOutput.startRecording(to: filePath, recordingDelegate: recordingDelegate)
    }
    
    func stopRecording(){
        videoFileOutput.stopRecording()
        print("🔴 RECORDING \(videoFileOutput.isRecording)")
    }
}

Answer 1

通過這個修改你的代碼

struct VideoRecordingView: UIViewRepresentable {
    
    @Binding var timeLeft: Int
    @Binding var onComplete: Bool
    @Binding var recording: Bool
    
    func makeUIView(context: UIViewRepresentableContext<VideoRecordingView>) -> PreviewView {
        let recordingView = PreviewView()
        recordingView.onComplete = {
            self.onComplete = true
        }
        
        recordingView.onRecord = { timeLeft, totalShakes in
            self.timeLeft = timeLeft
            self.recording = true
        }
        
        recordingView.onReset = {
            self.recording = false
            self.timeLeft = 30
        }
        return recordingView
    }
    
    func updateUIView(_ uiViewController: PreviewView, context: UIViewRepresentableContext<VideoRecordingView>) {
        if recording {
            uiViewController.start()
        }
    }
}

extension PreviewView: AVCaptureFileOutputRecordingDelegate{
    func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
        print(outputFileURL.absoluteString)
    }
}

class PreviewView: UIView {
    private var captureSession: AVCaptureSession?
    private var shakeCountDown: Timer?
    let videoFileOutput = AVCaptureMovieFileOutput()
    var recordingDelegate:AVCaptureFileOutputRecordingDelegate!
    var recorded = 0
    var secondsToReachGoal = 30
    
    var onRecord: ((Int, Int)->())?
    var onReset: (() -> ())?
    var onComplete: (() -> ())?
    
    init() {
        super.init(frame: .zero)
        
        var allowedAccess = false
        let blocker = DispatchGroup()
        blocker.enter()
        AVCaptureDevice.requestAccess(for: .video) { flag in
            allowedAccess = flag
            blocker.leave()
        }
        blocker.wait()
        
        if !allowedAccess {
            print("!!! NO ACCESS TO CAMERA")
            return
        }
        
        // setup session
        let session = AVCaptureSession()
        session.beginConfiguration()
        
        let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera,
                                                  for: .video, position: .front)
        guard videoDevice != nil, let videoDeviceInput = try? AVCaptureDeviceInput(device: videoDevice!), session.canAddInput(videoDeviceInput) else {
            print("!!! NO CAMERA DETECTED")
            return
        }
        session.addInput(videoDeviceInput)
        session.commitConfiguration()
        self.captureSession = session
    }
    
    override class var layerClass: AnyClass {
        AVCaptureVideoPreviewLayer.self
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    var videoPreviewLayer: AVCaptureVideoPreviewLayer {
        return layer as! AVCaptureVideoPreviewLayer
    }
    
    override func didMoveToSuperview() {
        super.didMoveToSuperview()
        recordingDelegate = self
    }
    
    func start() {
        startTimers()
        if nil != self.superview {
            self.videoPreviewLayer.session = self.captureSession
            self.videoPreviewLayer.videoGravity = .resizeAspect
            self.captureSession?.startRunning()
            self.startRecording()
        } else {
            self.captureSession?.stopRunning()
        }
    }
    private func onTimerFires(){
        print("🟢 RECORDING \(videoFileOutput.isRecording)")
        secondsToReachGoal -= 1
        recorded += 1
        onRecord?(secondsToReachGoal, recorded)
        
        if(secondsToReachGoal == 0){
            stopRecording()
            shakeCountDown?.invalidate()
            shakeCountDown = nil
            onComplete?()
            videoFileOutput.stopRecording()
        }
    }
    
    func startTimers(){
        if shakeCountDown == nil {
            shakeCountDown = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] (timer) in
                self?.onTimerFires()
            }
        }
    }
    
    func startRecording(){
        captureSession?.addOutput(videoFileOutput)
        
        let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let filePath = documentsURL.appendingPathComponent("tempPZDC")
        
        videoFileOutput.startRecording(to: filePath, recordingDelegate: recordingDelegate)
    }
    
    func stopRecording(){
        videoFileOutput.stopRecording()
        print("🔴 RECORDING \(videoFileOutput.isRecording)")
    }
}