相机只能在人像模式下快速拍照

Question

如何将相机设置为横向模式？每次我拍照时，图像都会保存为人像图像。当设备处于横向模式时，照片看起来不错，但如果我在相机胶卷中看到它，它仍然是纵向模式。这是我的拍照功能：

// take a photo
@IBAction func takePhoto(sender: AnyObject) {
self.fullScreenView.hidden = false
self.recordButton.enabled = false
self.takephoto.enabled = false
self.recordButton.hidden = true
self.takephoto.hidden = true

session.startRunning()

// customize the quality level or bitrate of the output photo
session.sessionPreset = AVCaptureSessionPresetPhoto

// add the AVCaptureVideoPreviewLayer to the view and set the view in fullscreen
fullScreenView.frame = view.bounds
videoPreviewLayer.frame = fullScreenView.bounds
fullScreenView.layer.addSublayer(videoPreviewLayer)

// add action to fullScreenView
gestureFullScreenView = UITapGestureRecognizer(target: self, action: #selector(ViewController.takePhoto(_:)))
self.fullScreenView.addGestureRecognizer(gestureFullScreenView)

// add action to myView
gestureView = UITapGestureRecognizer(target: self, action: #selector(ViewController.setFrontpage(_:)))
self.view.addGestureRecognizer(gestureView)

if (preview == true) {
    if let videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo) {
        // code for photo capture goes here...

        stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: { (sampleBuffer, error) -> Void in
            // process the image data (sampleBuffer) here to get an image file we can put in our view

            if (sampleBuffer != nil) {
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
                let image = UIImage(data: imageData, scale: 1.0)

                self.fullScreenView.hidden = true
                self.fullScreenView.gestureRecognizers?.forEach(self.fullScreenView.removeGestureRecognizer)
                self.session.stopRunning()

                // save image to the library
                UIImageWriteToSavedPhotosAlbum(image!, nil, nil, nil)

                self.imageViewBackground = UIImageView(frame: self.view.bounds)
                self.imageViewBackground.image = image
                self.imageViewBackground.tag = self.key

                self.view.addSubview(self.imageViewBackground)
            }
        })
    }
}
else {
    preview = true
}
}

我的预览看起来像这样，没关系：

http://img5.fotos-hochladen.net/uploads/bildschirmfotom4s7diaehy.png

但最终看起来是这样的：

http://img5.fotos-hochladen.net/uploads/bildschirmfoto3c2rlwtevf.png

提前致谢！

Answer 1

可能的解决方案：将图像保存为 JPEG 而不是 PNG

出现这种情况是因为 PNG 不存储方向信息。将照片另存为 JPG，这样它的方向就会正确。

拍摄图像后立即使用此代码将图像转换为 JPG（第二行是此处的操作行）：

let image = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
let imageData:NSData = UIImageJPEGRepresentation(image, 0.9)! // 0.9 is compression value: 0.0 is most compressed/lowest quality and 1.0 is least compressed/highest quality

来源+更多信息：/sf/answers/2435782331/

如果这不起作用

我在几个地方编辑了您的代码，看看下面的代码现在是否按您希望的方式工作：

// initialize saving photo capabilities
func image(image: UIImage, didFinishSavingWithError error: NSError?, contextInfo:UnsafePointer<Void>) {
        if error == nil {
            print("image saved")
        } else {
            print("save error: \(error?.localizedDescription)")
        }
}

// take a photo
@IBAction func takePhoto(sender: AnyObject) {
self.fullScreenView.hidden = false
self.recordButton.enabled = false
self.takephoto.enabled = false
self.recordButton.hidden = true
self.takephoto.hidden = true

session.startRunning()

// customize the quality level or bitrate of the output photo
session.sessionPreset = AVCaptureSessionPresetPhoto

// add the AVCaptureVideoPreviewLayer to the view and set the view in fullscreen
fullScreenView.frame = view.bounds
videoPreviewLayer.frame = fullScreenView.bounds
fullScreenView.layer.addSublayer(videoPreviewLayer)

// add action to fullScreenView
gestureFullScreenView = UITapGestureRecognizer(target: self, action: #selector(ViewController.takePhoto(_:)))
self.fullScreenView.addGestureRecognizer(gestureFullScreenView)

// add action to myView
gestureView = UITapGestureRecognizer(target: self, action: #selector(ViewController.setFrontpage(_:)))
self.view.addGestureRecognizer(gestureView)

if (preview == true) {
    if let videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo) {
        // code for photo capture goes here...

        stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: { (sampleBuffer, error) -> Void in
            // process the image data (sampleBuffer) here to get an image file we can put in our view

            if (sampleBuffer != nil) {
                self.stillImageOutput!.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
        if let videoConnection = self.stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo){
            videoConnection.videoOrientation = self.interfaceToVideoOrientation()
            self.stillImageOutput!.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {
                (sampleBuffer, error) in
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
                let image = UIImage(data: imageData)

                self.fullScreenView.hidden = true
                self.fullScreenView.gestureRecognizers?.forEach(self.fullScreenView.removeGestureRecognizer)
                self.session.stopRunning()

                // save image to the library
                UIImageWriteToSavedPhotosAlbum(image, self, #selector(ViewController.image(_:didFinishSavingWithError:contextInfo:)), nil)

                self.imageViewBackground = UIImageView(frame: self.view.bounds)
                self.imageViewBackground.image = image
                self.imageViewBackground.tag = self.key

                self.view.addSubview(self.imageViewBackground)
            }
        })
    }
}
else {
    preview = true
}
}