小编典典

如何使用AVCapturePhotoOutput

swift

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。


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2020-07-07

共1个答案

小编典典

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AVCapturePhotoOutputAVCaptureSession。所以像这样:session.addOutput(output),然后:output.capturePhoto(with:settings, delegate:self)谢谢@BigHeadCreations

2020-07-07