AVCaptureSession 图像是屏幕大小

Question

我正在使用 AVCaptureSession 创建相机并尝试用它拍照。这是加载相机的代码...

func reloadCamera() {

    cameraView.backgroundColor = UIColor.clearColor()

    captureSession = AVCaptureSession()

    captureSession!.sessionPreset = AVCaptureSessionPresetHigh

    let backCamera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
    if (camera == false) {
        let videoDevices = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo)

        for device in videoDevices {
            let device = device as! AVCaptureDevice
            if device.position == AVCaptureDevicePosition.Front {
                captureDevice = device
                break

            } else {
                captureDevice = backCamera
            }
        }

    } else {
        captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
    }

    do {
        let input = try AVCaptureDeviceInput(device: captureDevice)
        if captureSession!.canAddInput(input) {
            captureSession!.addInput(input)

            stillImageOutput = AVCaptureStillImageOutput()
            stillImageOutput!.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
            if captureSession!.canAddOutput(stillImageOutput) {
                captureSession!.addOutput(stillImageOutput)

                previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                previewLayer!.videoGravity = AVLayerVideoGravityResizeAspectFill
                previewLayer!.connection?.videoOrientation = AVCaptureVideoOrientation.Portrait
                previewLayer?.frame = cameraView.bounds
                cameraView.layer.addSublayer(previewLayer!)
                captureSession!.startRunning()

            }
        }
    } catch let error as NSError {
        // Handle any errors
        print(error)
    }

}

这是我拍照的方式...

func didPressTakePhoto(){
    toggleFlash()

    if let videoConnection = stillImageOutput?.connectionWithMediaType(AVMediaTypeVideo){
        videoConnection.videoOrientation = (previewLayer?.connection.videoOrientation)!
        stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {
            (sampleBuffer, error) in


            if sampleBuffer != nil {
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)

                self.capturedImage = UIImage(data: imageData)

                if self.camera == true {
                    self.capturedImage = UIImage(CGImage: self.capturedImage.CGImage!, scale: 1.0, orientation: UIImageOrientation.Right)

                } else {
                    self.capturedImage = UIImage(CGImage: self.capturedImage.CGImage!, scale: 1.0, orientation: UIImageOrientation.LeftMirrored)

                }



                self.tempImageView.image = self.capturedImage

                UIImageWriteToSavedPhotosAlbum(self.capturedImage, nil, nil, nil);

                self.tempImageView.hidden = false
                self.goButton.hidden = false
                self.cameraView.hidden = true
                self.removeImageButton.hidden = false
                self.captureButton.hidden = true
                self.flashChanger.hidden = true
                self.switchCameraButton.hidden = true

            }


        })
    }
}

但实际情况是拍摄的照片与整个屏幕一样大（如 Snapchat），但我只希望它与我从中获取的 UIView 一样大。如果我需要更多信息，请告诉我。谢谢！

Answer 1

首先，您是将捕获会话的预设设置为 AVCaptureSessionPresetHigh 的人。如果你不需要那个，就不要那样做；使用 smaller-size 预设。例如，使用 AVCaptureSessionPreset640x480 以获得更小的尺寸。

其次，无论生成的照片大小如何，将其缩小到您需要的大小并以该大小显示，完全取决于您。最终，这只是图像视图的大小和内容模式的问题，尽管最好也减小图像大小，以避免浪费内存（就像显示大得多的图像一样）然后向用户显示什么）。

AVCaptureSession 图像是屏幕大小

AVCaptureSession Image Is Size Of Screen

ios

swift

uiimageview

uiimage

avcapturesession