ios - 无法仅在 Swift 中显示相机(AVCapturePhotoOutput)的 UIView 的屏幕截图
<p><p>我想保存显示相机 View 的屏幕截图 (AVCapturePhotoOutput)。</p>
<p>我设置了cameraView(显示相机 View )并添加了其他具有UIButton等部分的UIView。</p>
<p>但是如果我保存它，保存到相机胶卷的图片只是一个白色 View 。
(当我尝试保存 self.view 的屏幕截图时，效果很好。)</p>
<p>我该如何解决？</p>
<pre><code>class ViewController: UIViewController, AVCapturePhotoCaptureDelegate{
//for camera
var captureDevice : AVCaptureDevice!
var captureSesssion: AVCaptureSession!
var stillImageOutput: AVCapturePhotoOutput?
var previewLayer: AVCaptureVideoPreviewLayer?
var videoConnection:AVCaptureConnection!
var topView: TopView! //on cameraView. It has some buttons and imageViews.
var cameraView:UIView! //that shows camera's view
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = (UIColor.black)
cameraView = UIView(frame: CGRect(x: 0.0, y: 0.0, width: self.view.frame.size.width, height: self.view.frame.size.height))
self.view.addSubview(cameraView)
captureSesssion = AVCaptureSession()
stillImageOutput = AVCapturePhotoOutput()
captureSesssion.sessionPreset = AVCaptureSessionPreset1280x720
captureDevice = AVCaptureDevice.defaultDevice(withDeviceType: .builtInWideAngleCamera, mediaType: AVMediaTypeVideo, position: .front)
do {
let input = try AVCaptureDeviceInput(device: captureDevice)
if (captureSesssion.canAddInput(input)) {
captureSesssion.addInput(input)
if (captureSesssion.canAddOutput(stillImageOutput)) {
captureSesssion.addOutput(stillImageOutput)
captureSesssion.startRunning()
previewLayer = AVCaptureVideoPreviewLayer(session: captureSesssion)
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
previewLayer?.connection.automaticallyAdjustsVideoMirroring = false
previewLayer?.connection.isVideoMirrored = true
cameraView.layer.addSublayer(previewLayer!)
previewLayer?.position = CGPoint(x: self.view.frame.width / 2, y: self.view.frame.height / 2)
previewLayer?.bounds = self.view.frame
}
}
}
catch {
print(error)
}
topView = TopView.init(frame: CGRect(x: 0, y: 0, width: 320, height: 568))
topView.viewController = self
self.view.addSubview(topView)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first!
captureSesssion.stopRunning() //for taking still picture
let layer = UIApplication.shared.keyWindow?.layer
let scale = UIScreen.main.scale
UIGraphicsBeginImageContextWithOptions((layer?.frame.size)!, false, scale);
cameraView.layer.render(in: UIGraphicsGetCurrentContext()!)
let screenshot = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
//save the screenshot to camera roll
UIImageWriteToSavedPhotosAlbum(screenshot!, nil, nil, nil);
}
}
</code></pre>
<p><strong>更新:</strong></p>
<p>增加了制作CAShapeLayer的代码，但是无法显示相机 View ，保存图片后，图片只是白色的图片......</p>
<pre><code>cameraView = UIView(frame: CGRect(x: 0.0, y: 0.0, width: self.view.frame.size.width, height: self.view.frame.size.height))
self.view.addSubview(cameraView)
let cropRectOverlay = CAShapeLayer() //added
cameraView.layer.mask = cropRectOverlay //added
cameraView.layer.addSublayer(cropRectOverlay) //added
...
previewLayer?.connection.automaticallyAdjustsVideoMirroring = false
previewLayer?.connection.isVideoMirrored = true
cameraView.layer.addSublayer(cropRectOverlay) //added
...
UIGraphicsBeginImageContextWithOptions(cameraView.bounds.size, false, 0); //added
cameraView.layer.render(in: UIGraphicsGetCurrentContext()!) //added
let image = UIGraphicsGetImageFromCurrentImageContext(); //added
UIGraphicsEndImageContext(); //added
//When added resultImageView, it shows black view.
//let resultImageView = UIImageView(frame: self.view.frame)
//resultImageView.image = image
//self.view.addSubview(resultImageView)
UIImageWriteToSavedPhotosAlbum(image!, nil, nil, nil);
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>来自捕获 session 的图像</p>
<pre><code>let stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput.outputSettings =
if captureSession.canAddOutput(stillImageOutput) {
captureSession.addOutput(stillImageOutput)
}
func captureImage() {
let videoConnection = stillImageOutput.connection(withMediaType: AVMediaTypeVideo)
stillImageOutput.captureStillImageAsynchronously(from: videoConnection, completionHandler: {(ingDataBuffer, error) in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(ingDataBuffer)
self.imgView.image = UIImage(data: imageData!)
})
}
</code></pre>
<p>UIView 截图</p>
<pre><code>UIGraphicsBeginImageContextWithOptions(cameraView.bounds.size, false, 0);
cameraView.layer.render(in: UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
</code></pre>
<p>AVCapturePhotoCaptureDelegate </p>
<p>将委托(delegate)设置为自己</p>
<pre><code>func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: NSError?) {
if let sampleBuffer = photoSampleBuffer, let previewBuffer = previewPhotoSampleBuffer, let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
print(image: UIImage(data: dataImage).size)
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 无法仅在 Swift 中显示相机(AVCapturePhotoOutput)的 UIView 的屏幕截图，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/42687723/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/42687723/
</a>
</p>
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