Question

我有一个自定义相机，以纵向模式拍照。

我的问题是，如果我尝试拍摄横向照片并保存，那么图片仍然会以纵向模式保存。

我有这个功能来设置previewLayer：

 static func setupPreviewLayer(view: UIView) {
    cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
    cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
    switch UIDevice.current.orientation {
    case .portrait:
        cameraPreviewLayer?.connection?.videoOrientation = 
       AVCaptureVideoOrientation.portrait
    case .portraitUpsideDown:
        cameraPreviewLayer?.connection?.videoOrientation = 
          AVCaptureVideoOrientation.portraitUpsideDown
    case .landscapeLeft:
        cameraPreviewLayer?.connection?.videoOrientation =
        AVCaptureVideoOrientation.landscapeLeft
    case .landscapeRight:
        cameraPreviewLayer?.connection?.videoOrientation = 
         AVCaptureVideoOrientation.landscapeRight
    default:
        cameraPreviewLayer?.connection?.videoOrientation = 
         AVCaptureVideoOrientation.portrait
    }
    cameraPreviewLayer?.frame = view.frame
    view.layer.insertSublayer(cameraPreviewLayer!, at: 0)
}

我在viewWillAppear中调用它（我认为这不是正确的方法）。

然后我拍了照片：

@IBAction func takePhotoBtnPressed(_ sender: Any) {
    let settings = AVCapturePhotoSettings()
    useFlash(settings: settings)
    settings.isAutoStillImageStabilizationEnabled = true
    CustomCamera.photoOutput?.capturePhoto(with: settings, delegate: self)
}

并使用此扩展程序：

extension FishCameraVC: AVCapturePhotoCaptureDelegate {
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
    if let imageData = photo.fileDataRepresentation() {
        image = UIImage(data: imageData)


          performSegue(withIdentifier: "ShowTakenPhoto", sender: nil)
        }
    }
}

只要我拍摄了一张肖像模式照片，但是当我旋转手机拍摄风景照片时，所有内容都能正常工作，那么照片仍会以人像拍摄。

这是我第一次使用自定义相机，我真的不知道从哪里开始修复这个... 如果有人可以提供帮助，我会非常感激。

谢谢！

--------------- UPDATE 我添加了这个功能：

func managePhotoOrientation() -> UIImageOrientation {
    var currentDevice: UIDevice
    currentDevice = .current
    UIDevice.current.beginGeneratingDeviceOrientationNotifications()
    var deviceOrientation: UIDeviceOrientation
    deviceOrientation = currentDevice.orientation

    var imageOrientation: UIImageOrientation!

    if deviceOrientation == .portrait {
        imageOrientation = .up
        print("Device: Portrait")
    }else if (deviceOrientation == .landscapeLeft){
        imageOrientation = .left
        print("Device: LandscapeLeft")
    }else if (deviceOrientation == .landscapeRight){
        imageOrientation = .right
        CustomCamera.cameraPreviewLayer?.connection?.videoOrientation = .landscapeRight
        print("Device LandscapeRight")
    }else if (deviceOrientation == .portraitUpsideDown){
        imageOrientation = .down
        print("Device PortraitUpsideDown")
    }else{
       imageOrientation = .up
    }
    return imageOrientation
}

并将我的扩展名改为：

    extension FishCameraVC: AVCapturePhotoCaptureDelegate {
    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
        if let imageData = photo.fileDataRepresentation() {
            image = UIImage(data: imageData)
            let dataProvider  = CGDataProvider(data: imageData as CFData)
            let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
            self.image = UIImage(cgImage: cgImageRef!, scale: 1.0, orientation: imageOrientation!)
            performSegue(withIdentifier: "ShowTakenPhoto", sender: nil)
        }
    }
}

图像以正确的方向显示在预览中，但是当我保存图像时，它会转到肖像...

Answer 1

您需要在调用capturePhoto（）

之前运行以下代码

if let photoOutputConnection = CustomCamera.photoOutput.connection(with: AVMediaType.video) {
    photoOutputConnection.videoOrientation = videoDeviceOrientation
}

您可以使用managePhotoOrientation（）函数获取videoDeviceOrientation。

Answer 2

我有一个类似的问题并通过根据拍摄的照片生成新图像来修复它：

UIGraphicsBeginImageContextWithOptions(image.size, false, image.scale)
image.draw(in: CGRect(origin: .zero, size: image.size))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

显然，iOS生成的图像元数据（包括方向）不完整，一些观看者（在我的情况下是Chrome和Safari浏览器）无法正确呈现图像。通过重新渲染，似乎可以为所有观看者正确设置元数据。

注意1）在我的应用程序中我也缩小图像（我不认为这会改变效果）和2）我通过其他方式捕获图像（即UIImagePickerController）;不过，你可以尝试一下我的hacky修复。

Answer 3

Swift 4.2最新的AVFoundation语法捕获图像方向（经过测试的代码）。

UIGraphicsBeginImageContextWithOptions((image?.size)!, false, (image?.scale)!)
image?.draw(in: CGRect(origin: .zero, size: (image?.size)!))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

Swift - AVFoundation捕获图像方向

3 个答案: