Swift 3 AVCaptureSession 图像输出是纵向而不是横向答案

【问题标题】：Swift 3 AVCaptureSession image output is in portrait instead of landscapeSwift 3 AVCaptureSession 图像输出是纵向而不是横向
【发布时间】：2017-01-25 11:57:36
【问题描述】：

我制作了一个简单的 iOS 应用程序，它可以拍摄照片并将其保存到设备的库中。我期待一个横向图像作为输出，但相机产生的是横向图像的纵向方向，比如 50x100，图像旋转 90 度。我希望图像是横向的，但我不确定我的代码有什么问题。

我需要我的预览层是横向的，所以我将我的 AVCaptureVideoOrientation 设置为所需的方向。

previewLayer.connection.videoOrientation = AVCaptureVideoOrientation.landscapeRight

这里是配置：

override func viewWillAppear(_ animated: Bool) {

    let devices = AVCaptureDevice.devices(withMediaType: AVMediaTypeVideo)
    for device in devices! {
        if (device as AnyObject).position == AVCaptureDevicePosition.back {

            do {

                let input = try AVCaptureDeviceInput(device: device as! AVCaptureDevice)

                if (captureSession.canAddInput(input)) {

                    captureSession.sessionPreset = AVCaptureSessionPresetPhoto
                    captureSession.addInput(input)
                    sessionOutput.outputSettings = [AVVideoCodecKey : AVVideoCodecJPEG]


                    if (captureSession.canAddOutput(sessionOutput)) {

                        captureSession.addOutput(sessionOutput)
                        captureSession.startRunning()

                        previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                        previewLayer.videoGravity = AVLayerVideoGravityResize
                        previewLayer.connection.videoOrientation = AVCaptureVideoOrientation.landscapeRight
                        previewLayer.frame = self.cameraView.bounds
                        cameraView.layer.addSublayer(previewLayer)

                        previewLayer.position = CGPoint(x: self.cameraView.frame.width / 2, y: self.cameraView.frame.height / 2)
                        previewLayer.bounds = cameraView.frame

                        cameraView.addSubview(captureBtn)
                        cameraView.addSubview(shutterTimer)

                    }

                }

            } catch let err {

                print(err)
                return

            }

        }
    }

}

图像输出

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

        sessionOutput.captureStillImageAsynchronously(from: videoConnection, completionHandler: { (buffer, error) in

            let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
            let image = UIImage(data: imageData!)!
            UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
            print(UIImage(data: imageData!)!)

        })

    }

【问题讨论】：

标签： swift3 avfoundation orientation avcapturesession ios-camera

【解决方案1】：

我明白了！因此，在将图像保存到库之前，您必须根据预览层上的内容设置输出方向，只需添加以下行：

videoConnection.videoOrientation = .landscapeRight

....

if let videoConnection = sessionOutput.connection(withMediaType: AVMediaTypeVideo) {
        // set output orientation before saving
        videoConnection.videoOrientation = .landscapeRight
        sessionOutput.captureStillImageAsynchronously(from: videoConnection, completionHandler: { (buffer, error) in

            let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
            let image = UIImage(data: imageData!)!
            UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)                
        })

    }

【讨论】：