这是我的相机的代码，将前置摄像头更换为后置摄像头，如果我用后置摄像头拍照，照片的方向是好的（原始），但如果我用前面拍照相机拍摄的图像方向不正确。
class TakeSelfieViewController: UIViewController, AVCapturePhotoCaptureDelegate {
var captureSession = AVCaptureSession()
var photoOutput = AVCapturePhotoOutput()
var previewLayer : AVCaptureVideoPreviewLayer?
var captureDevice : AVCaptureDevice?
var sessionOutputSetting = AVCapturePhotoSettings(format: [AVVideoCodecKey:AVVideoCodecJPEG])
var toggle = false
@IBOutlet weak var cameraView: UIView!
@IBOutlet weak var tempImageView: UIImageView!
@IBOutlet weak var adorButton: UIButton!
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
previewLayer?.frame = cameraView.bounds
let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.light)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = adorButton.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
adorButton.addSubview(blurEffectView)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
pickCamera(which: toggle)
}
func pickCamera(which: Bool) {
if (which == true) {
let deviceDescovery = AVCaptureDeviceDiscoverySession(deviceTypes: [AVCaptureDeviceType.builtInDualCamera, AVCaptureDeviceType.builtInTelephotoCamera,AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.back)
print("back camera")
startCamera(deviceDesc: deviceDescovery!)
toggle = true
} else if (which == false) {
let deviceDescovery = AVCaptureDeviceDiscoverySession(deviceTypes: [AVCaptureDeviceType.builtInDualCamera, AVCaptureDeviceType.builtInTelephotoCamera,AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.front)
print("front camera")
startCamera(deviceDesc: deviceDescovery!)
toggle = false
}
}
func startCamera(deviceDesc: AVCaptureDeviceDiscoverySession!) {
for device in (deviceDesc.devices)! {
if device.position == AVCaptureDevicePosition.back {
do {
let input = try AVCaptureDeviceInput(device: device)
if captureSession.canAddInput(input) {
captureSession.addInput(input)
if captureSession.canAddOutput(photoOutput) {
captureSession.addOutput(photoOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
cameraView.layer.addSublayer(previewLayer!)
captureSession.startRunning()
print("ADD Back")
} else { print("Cannot add input - back") }
}
} catch {
print("Error")
}
} else if (device.position == AVCaptureDevicePosition.front) {
do {
let input = try AVCaptureDeviceInput(device: device)
print(input)
if captureSession.canAddInput(input) {
captureSession.addInput(input)
if captureSession.canAddOutput(photoOutput) {
captureSession.addOutput(photoOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
cameraView.layer.addSublayer(previewLayer!)
captureSession.startRunning()
print("ADD Front")
}
} else { print("Cannot add input - front") }
} catch {
print(error)
}
}
}
}
func didPressTakePhoto() {
if let videoConnection = photoOutput.connection(withMediaType: AVMediaTypeVideo) {
videoConnection.videoOrientation = AVCaptureVideoOrientation.portrait
let settings = AVCapturePhotoSettings(format: [AVVideoCodecKey : AVVideoCodecJPEG])
photoOutput.capturePhoto(with: settings, delegate: self)
}
}
func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {
let imageData = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: photoSampleBuffer!, previewPhotoSampleBuffer: previewPhotoSampleBuffer)
let dataProvider = CGDataProvider(data: imageData as! CFData)
let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: CGColorRenderingIntent.defaultIntent)
let image = UIImage(cgImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.right)
self.tempImageView.image = image
self.tempImageView.isHidden = false
self.yellowButton.isHidden = true
self.toggleAction.isHidden = true
self.adorButton.isHidden = true
print("Hola")
}
var didTakePhoto = Bool()
@IBOutlet weak var yellowButton: UIButton!
@IBOutlet weak var toggleAction: UIButton!
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
if didTakePhoto {
tempImageView.isHidden = true
yellowButton.isHidden = false
toggleAction.isHidden = false
adorButton.isHidden = false
didTakePhoto = false
print("")
}
}
@IBAction func yellowPressed(_ sender: UIButton) {
captureSession.startRunning()
didTakePhoto = true
didPressTakePhoto()
print("")
}
@IBAction func toggleCamera(_ sender: Any) {
if (toggle == false) {
print("Changing to back camera")
let currentCameraInput: AVCaptureInput = captureSession.inputs[0] as! AVCaptureInput
captureSession.removeInput(currentCameraInput)
toggle = true
pickCamera(which: toggle)
} else if (toggle == true) {
print("Changing to front camera")
let currentCameraInput: AVCaptureInput = captureSession.inputs[0] as! AVCaptureInput
captureSession.removeInput(currentCameraInput)
toggle = false
pickCamera(which: toggle)
}
}
override var prefersStatusBarHidden: Bool {
return true
}
}
我该如何解决这个问题？
答案 0 :(得分：1)
使用前置摄像头拍摄的图像是镜像的，当您对图片进行故障排除时，图像方向在其EXIF词典中进行，或者在元数据字典内传递。
大多数情况下，当您将其作为JPG或PNG传递时，如果您不直接处理此值，则不会考虑此值。
如果你在风景中拍照，你应该会遇到类似的问题
在你的捕捉方法中，当你应该处理它时，似乎你正在强制定向到固定值
很久以前我写了这个post，我认为它可以帮助你检测你的问题，即使大多数是用objC编写的。我写了一些关于相机输出方向的实验。