ios – 拍摄AVCaptureVideoPreviewLayer视图的快照

概述我正在使用WebRTC在两个用户之间建立视频聊天.我想拍摄localView视图的快照,其中显示了其中一个人. 这是我的类configureLocalPreview方法,它将视频流与UIViews连接起来： @IBOutlet var remoteView: RTCEAGLVideoView!@IBOutlet var localView: UIView!var captureSession 我正在使用WebRTC在两个用户之间建立视频聊天.我想拍摄localVIEw视图的快照,其中显示了其中一个人.

这是我的类configureLocalPrevIEw方法,它将视频流与UIVIEws连接起来：

@IBOutlet var remoteVIEw: RTCEAGLVIDeoVIEw!@IBOutlet var localVIEw: UIVIEw!var captureSession: AVCaptureSession?var vIDeoSource: RTCAVFoundationVIDeoSource?var vIDeoTrack: RTCVIDeoTrack?func configureLocalPrevIEw() {    self.vIDeoTrack = self.signaling.localMediaStream.self.vIDeoTracks.first as! RTCVIDeoTrack?    self.vIDeoSource = (self.vIDeoTrack?.source as? RTCAVFoundationVIDeoSource)    self.captureSession = self.vIDeoSource?.self.captureSession    self.prevIEwLayer = AVCaptureVIDeoPrevIEwLayer.init(session: self.captureSession)    self.prevIEwLayer.frame = self.localVIEw.bounds    self.localVIEw.layer.addSublayer(self.prevIEwLayer)    self.localVIEw.isUserInteractionEnabled = true    //self.localVIEw.layer.position = CGPointMake(100,100);}

在我想要访问快照的地方,我打电话给：

self.localVIEw.pb_takeSnapshot()

pb_takeSnapshot来自UIVIEw扩展,我在另一篇文章中找到了它.它的定义如下：

extension UIVIEw {    func pb_takeSnapshot() -> UIImage {    UIGraphicsBeginImageContextWithOptions(bounds.size,false,UIScreen.main.scale)    drawHIErarchy(in: self.bounds,afterScreenUpdates: true)    let image = UIGraphicsGetimageFromCurrentimageContext()!    UIGraphicsEndImageContext()    return image    }}

当我看一下Xcode调试器中的图像时,它看起来完全是绿色的,而我在iphone屏幕上(在该视图内)可以看到的人不在那里：

这个人不可见的原因是什么？难道不知道是不可能制作一个流的快照？谢谢你看看！

解决方法 您应该使用RTCEAGLVIDeoVIEw而不是UIVIEw创建localVIEw.我使用相同的localVIEw,并使用您的帖子中提到的相同代码片段拍摄快照.

下面是示例代码,它将启动您的相机并显示本地预览：

class VIEwController: UIVIEwController,RTCEAGLVIDeoVIEwDelegate {var captureSession: AVCaptureSession?var prevIEwLayer :AVCaptureVIDeoPrevIEwLayer?var peerConnectionFactory: RTCPeerConnectionFactory!var vIDeoSource:RTCAVFoundationVIDeoSource!var localTrack :RTCVIDeoTrack!@IBOutlet var myVIEw: UIVIEw!overrIDe func vIEwDIDLoad() {    super.vIEwDIDLoad()    /*myVIEw = UIVIEw(frame: CGRect(x: 0,y: 0,wIDth: UIScreen.main.bounds.size.wIDth,height: UIScreen.main.bounds.size.height))*/    startCamera()    // Do any additional setup after loading the vIEw,typically from a nib.}fileprivate func startCamera() {    peerConnectionFactory = RTCPeerConnectionFactory()    RTCInitializeSSL();    RTCSetupInternalTracer();    RTCSetMinDeBUGLogLevel(RTCLoggingSeverity.info)    vIDeoSource = peerConnectionFactory.avFoundationVIDeoSource(with: nil);    localTrack  = peerConnectionFactory.vIDeoTrack(with: vIDeoSource,trackID: "ARdamSv0")    let localScaleX = CGfloat(1.0)    let localVIEw : RTCEAGLVIDeoVIEw = RTCEAGLVIDeoVIEw(frame: self.vIEw.bounds)    self.vIEw.insertSubvIEw(localVIEw,at: 1)    localVIEw.frame = self.vIEw.bounds;    localVIEw.transform = CGAffinetransform(scaleX: localScaleX,y: 1)    localTrack.add(localVIEw)}overrIDe func dIDReceiveMemoryWarning() {    super.dIDReceiveMemoryWarning()    // dispose of any resources that can be recreated.}overrIDe func vIEwDIDAppear(_ animated: Bool) {    //prevIEwLayer?.frame.size = myVIEw.frame.size}func vIDeoVIEw(_ vIDeoVIEw: RTCEAGLVIDeoVIEw,dIDChangeVIDeoSize size: CGSize) {    print("InsIDe dIDChangeVIDeoSize")}}

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