如何使用AVCapturePhotoOutput

Question

我一直在使用自定义相机，最近我与Swift 3一起升级到了Xcode 8 beta。

var stillImageOutput: AVCaptureStillImageOutput?

但是，我现在收到警告：

iOS 10.0中不推荐使用“ AVCaptureStillImageOutput”：改用AVCapturePhotoOutput

由于这是相当新的内容，因此我没有看到太多信息。这是我当前的代码：

var captureSession: AVCaptureSession?
var stillImageOutput: AVCaptureStillImageOutput?
var previewLayer: AVCaptureVideoPreviewLayer?

func clickPicture() {

    if let videoConnection = stillImageOutput?.connection(withMediaType: AVMediaTypeVideo) {

        videoConnection.videoOrientation = .portrait
        stillImageOutput?.captureStillImageAsynchronously(from: videoConnection, completionHandler: { (sampleBuffer, error) -> Void in

            if sampleBuffer != nil {

                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
                let dataProvider = CGDataProvider(data: imageData!)
                let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)

                let image = UIImage(cgImage: cgImageRef!, scale: 1, orientation: .right)

            }

        })

    }

}

我尝试查看AVCapturePhotoCaptureDelegate，但是我不确定如何使用它。有人知道如何使用吗？谢谢。

Answer 1

更新到Swift 4 Hi，它真的很容易使用AVCapturePhotoOutput。

您需要AVCapturePhotoCaptureDelegate返回的 CMSampleBuffer。

如果您告诉AVCapturePhotoSettingsPreviewFormat，则还可以获得预览图像。

    class CameraCaptureOutput: NSObject, AVCapturePhotoCaptureDelegate {

        let cameraOutput = AVCapturePhotoOutput()

        func capturePhoto() {

          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
          self.cameraOutput.capturePhoto(with: settings, delegate: self)

        }

func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photoSampleBuffer: CMSampleBuffer?, previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {                        
            if let error = error {
                print(error.localizedDescription)
            }

            if let sampleBuffer = photoSampleBuffer, let previewBuffer = previewPhotoSampleBuffer, let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
              print("image: \(UIImage(data: dataImage)?.size)") // Your Image
            }   
        }
    }

有关更多信息，请访问https://developer.apple.com/reference/AVFoundation/AVCapturePhotoOutput

注意：拍摄照片之前，您必须将添加AVCapturePhotoOutput到AVCaptureSession。所以像这样：session.addOutput(output)，然后：output.capturePhoto(with:settings, delegate:self)谢谢@BigHeadCreations