Ios 从摄像头拍摄的iphone图像会自动快速旋转

通过编程，我已经在我的应用程序中从相机中捕获了图像。它已经被很好地抓取了，但是当我切换到另一个视图时，查看并关闭该视图，此时我想将图像旋转到风景中。我用照相机拍下了照片。当我从照片库中获取图像时，没有发现任何问题

以下图像是我的原始图像。

我想旋转图像。

下面的代码：

var captureSesssion : AVCaptureSession!
var cameraOutput : AVCapturePhotoOutput!
var previewLayer : AVCaptureVideoPreviewLayer!
var device:AVCaptureDevice!
var currentViewControl = UIViewController()
var tempImageHolder = UIImage()

func beginCamera(_ targetView: UIView, _ currentVC: UIViewController) 
{ 
    currentViewControl = currentVC
    // Do any additional setup after loading the view, typically from a nib.
    captureSesssion = AVCaptureSession()
    captureSesssion.sessionPreset = AVCaptureSession.Preset.photo
    cameraOutput = AVCapturePhotoOutput()

    if #available(iOS 11.1, *) {
        let availableDevices = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera, .builtInTelephotoCamera, .builtInTrueDepthCamera], mediaType: AVMediaType.video, position: .back).devices
        device = availableDevices.first
    } else {
        // Fallback on earlier versions
        device = AVCaptureDevice.default(for: .video)!
    }

    if let input = try? AVCaptureDeviceInput(device: device!) {
        if (captureSesssion.canAddInput(input)) {
            captureSesssion.addInput(input)
            if (captureSesssion.canAddOutput(cameraOutput)) {
                captureSesssion.addOutput(cameraOutput)
                let connection = cameraOutput.connection(with: AVFoundation.AVMediaType.video)
                connection?.videoOrientation = .portrait
                previewLayer = AVCaptureVideoPreviewLayer(session: captureSesssion)
                self.previewLayer.frame = targetView.frame
                self.previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
                //setOutputOrientation()
                targetView.layer.addSublayer(previewLayer)
                captureSesssion.startRunning()
            }
        } else {
            print("issue here : captureSesssion.canAddInput")
        }
    } else {
        print("some problem here")
    }
    previewLayer?.frame.size = targetView.frame.size
}

   func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
    if let error = error {
        // we got back an error!
        let alert = UIAlertController(title: "Error", message: error.localizedDescription, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default))
        currentViewControl.present(alert, animated: true)
    } else {
    }}


 func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
    let imageData = photo.fileDataRepresentation()
    let imageSize: Int = imageData!.count
    print(imageSize)
    tempImageHolder = UIImage(data: (imageData! as NSData) as Data)!
    //When use this below line works fine when take images from left landscape, but when take images from right landscape image not show properly screen shot below:
    tempImageHolder = UIImage(cgImage: tempImageHolder.cgImage!, scale: tempImageHolder.scale, orientation: .up)
    }
}

从左侧风景拍摄图像时：

var captureSesssion : AVCaptureSession!
var cameraOutput : AVCapturePhotoOutput!
var previewLayer : AVCaptureVideoPreviewLayer!
var device:AVCaptureDevice!
var currentViewControl = UIViewController()
var tempImageHolder = UIImage()

func beginCamera(_ targetView: UIView, _ currentVC: UIViewController) 
{ 
    currentViewControl = currentVC
    // Do any additional setup after loading the view, typically from a nib.
    captureSesssion = AVCaptureSession()
    captureSesssion.sessionPreset = AVCaptureSession.Preset.photo
    cameraOutput = AVCapturePhotoOutput()

    if #available(iOS 11.1, *) {
        let availableDevices = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera, .builtInTelephotoCamera, .builtInTrueDepthCamera], mediaType: AVMediaType.video, position: .back).devices
        device = availableDevices.first
    } else {
        // Fallback on earlier versions
        device = AVCaptureDevice.default(for: .video)!
    }

    if let input = try? AVCaptureDeviceInput(device: device!) {
        if (captureSesssion.canAddInput(input)) {
            captureSesssion.addInput(input)
            if (captureSesssion.canAddOutput(cameraOutput)) {
                captureSesssion.addOutput(cameraOutput)
                let connection = cameraOutput.connection(with: AVFoundation.AVMediaType.video)
                connection?.videoOrientation = .portrait
                previewLayer = AVCaptureVideoPreviewLayer(session: captureSesssion)
                self.previewLayer.frame = targetView.frame
                self.previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
                //setOutputOrientation()
                targetView.layer.addSublayer(previewLayer)
                captureSesssion.startRunning()
            }
        } else {
            print("issue here : captureSesssion.canAddInput")
        }
    } else {
        print("some problem here")
    }
    previewLayer?.frame.size = targetView.frame.size
}

   func image(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
    if let error = error {
        // we got back an error!
        let alert = UIAlertController(title: "Error", message: error.localizedDescription, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default))
        currentViewControl.present(alert, animated: true)
    } else {
    }}


 func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
    let imageData = photo.fileDataRepresentation()
    let imageSize: Int = imageData!.count
    print(imageSize)
    tempImageHolder = UIImage(data: (imageData! as NSData) as Data)!
    //When use this below line works fine when take images from left landscape, but when take images from right landscape image not show properly screen shot below:
    tempImageHolder = UIImage(cgImage: tempImageHolder.cgImage!, scale: tempImageHolder.scale, orientation: .up)
    }
}

输入：

输出：

从右侧风景拍摄图像时

输入：

输出：

当使用此选项时，从左侧横向拍摄图像时，上面的线条效果良好，但从右侧横向拍摄图像时，屏幕截图无法正确显示

有人能给我解释一下如何旋转图像吗。任何帮助都将不胜感激

提前谢谢

enum CGImageOrientation {
case up
case down
case left
case right
case upMirrored
case downMirrored
case leftMirrored
case rightMirrored
}

  extension CGImage {
   func orientImage(_ imageOrientation: CGImageOrientation) -> 
   CGImage? {
    return orientImageWithTransform(imageOrientation).0
 }

func orientImageWithTransform(_ imageOrientation: CGImageOrientation) -> (CGImage?, CGAffineTransform) {

    var transform = CGAffineTransform.identity
    if imageOrientation == .up { return (self.copy(), transform)}


    let size = CGSize(width: width, height: height)
    let newSize = [.left,.leftMirrored, .right, .rightMirrored].contains(imageOrientation)
        ? CGSize(width: size.height, height: size.width) : size

    // Guard that we have color space and core graphics context.
    guard let colorSpace = self.colorSpace,
        // New graphic context uses transformed width and height.
        let ctx = CGContext(data: nil, width: Int(newSize.width), height: Int(newSize.height),
                            bitsPerComponent: self.bitsPerComponent, bytesPerRow: 0,
                            space: colorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue)
        else { return (nil, transform)}

    // OK, now the actual work of constructing transform and creating new image.
    switch imageOrientation {
    case .down, .downMirrored:
        transform = transform.translatedBy(x: size.width, y: size.height)
        transform = transform.rotated(by: CGFloat.pi)
        break
    case .left,.leftMirrored:
        transform = transform.translatedBy(x: size.height, y: 0)
        transform = transform.rotated(by: CGFloat.pi/2)
        break
    case .right, .rightMirrored:
        transform = transform.translatedBy(x: 0, y: size.width)
        transform = transform.rotated(by: -CGFloat.pi/2)
        break
    case .up, .upMirrored:
        break
    }

    if [.upMirrored, .downMirrored,.leftMirrored, .rightMirrored].contains(imageOrientation) {
        transform = transform.translatedBy(x: size.width, y: 0)
        transform = transform.scaledBy(x: -1, y: 1)
    }

    ctx.concatenate(transform)
    // Interestingly, drawing with the original width and height?!
    // So width and height here are pre-transform.

    ctx.draw(self, in: CGRect(x: 0, y: 0, width: size.width, height: size.height))

    return (ctx.makeImage(), transform)
}

}

使用：-

var tempImage = imgae
        guard let cgImage = imgae?.cgImage else {return}

        if let orientedImage = cgImage.orientImage(.upMirrored) {
            tempImage = UIImage(cgImage: orientedImage)
        }
        let image = UIImageView(image: tempImage)

}

使用：-

var tempImage = imgae
        guard let cgImage = imgae?.cgImage else {return}

        if let orientedImage = cgImage.orientImage(.upMirrored) {
            tempImage = UIImage(cgImage: orientedImage)
        }
        let image = UIImageView(image: tempImage)

---

问题在于，在将

UIImage

转换为

CGImage

时，您正在丢弃图像元数据（包括方向）。在访问其

cgImage

属性之前，需要呈现一个新的

UIImage

，如本文所示

---

---

问题在于，在将

UIImage

转换为

CGImage

时，您正在丢弃图像元数据（包括方向）。在访问其

cgImage

属性之前，需要呈现一个新的

UIImage

，如本文所示

---

---

尝试以下功能以固定方向：

extension UIImage {
    func makeFixOrientation() -> UIImage {
        if self.imageOrientation == UIImage.Orientation.up {
            return self
        }

        UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
        self.draw(in: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height))
        let normalizedImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()

        return normalizedImage;
    }
}

---

尝试以下功能以固定方向：

extension UIImage {
    func makeFixOrientation() -> UIImage {
        if self.imageOrientation == UIImage.Orientation.up {
            return self
        }

        UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
        self.draw(in: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height))
        let normalizedImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()

        return normalizedImage;
    }
}

---

这是一个非常恼人的问题，我真的不敢相信AVFoundation没有更容易的解决方案。但在我的应用程序中，我通过保持当前的设备方向来实现这一点。当照片输出返回图像时，使用方向旋转图像，以确保所有内容都向上拍摄

class MyViewController: UIViewController {

    var currentOrientation: UIDeviceOrientation = .portrait

    override func viewDidLoad() {
        NotificationCenter.default.addObserver(self, selector: #selector(orientationChanged), name: UIDevice.orientationDidChangeNotification, object: nil)
    }

    @objc func orientationChanged() {
        currentOrientation = UIDevice.current.orientation
    }

    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
        guard let img = photo.cgImageRepresentation()?.takeUnretainedValue() else { return }
        let temp = CIImage(cgImage: img)
        var ciImage = temp;
        switch currentOrientation {
            case .portrait:
                ciImage = temp.oriented(forExifOrientation: 6)
            case .landscapeRight:
                ciImage = temp.oriented(forExifOrientation: 3)
            case .landscapeLeft:
                ciImage = temp.oriented(forExifOrientation: 1)
            default:
                break
        }

        guard let cgImage = CIContext(options: nil).createCGImage(ciImage, from: ciImage.extent) else { return }
        let fixedImage = UIImage(cgImage: cgImage)
    }


}

---

最后，根据您的需要使用fixedImage。请注意，我订阅了通知中心以更改方向。

这是一个非常烦人的问题，我真的无法相信AVFoundation没有任何更方便我们的方法。但在我的应用程序中，我通过保持当前的设备方向来实现这一点。当照片输出返回图像时，使用方向旋转图像，以确保所有内容都向上拍摄

class MyViewController: UIViewController {

    var currentOrientation: UIDeviceOrientation = .portrait

    override func viewDidLoad() {
        NotificationCenter.default.addObserver(self, selector: #selector(orientationChanged), name: UIDevice.orientationDidChangeNotification, object: nil)
    }

    @objc func orientationChanged() {
        currentOrientation = UIDevice.current.orientation
    }

    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
        guard let img = photo.cgImageRepresentation()?.takeUnretainedValue() else { return }
        let temp = CIImage(cgImage: img)
        var ciImage = temp;
        switch currentOrientation {
            case .portrait:
                ciImage = temp.oriented(forExifOrientation: 6)
            case .landscapeRight:
                ciImage = temp.oriented(forExifOrientation: 3)
            case .landscapeLeft:
                ciImage = temp.oriented(forExifOrientation: 1)
            default:
                break
        }

        guard let cgImage = CIContext(options: nil).createCGImage(ciImage, from: ciImage.extent) else { return }
        let fixedImage = UIImage(cgImage: cgImage)
    }


}

最后，根据您的需要使用fixedImage。请注意，我订阅了通知中心，以更改方向

从iOS 4.0开始，相机拍照时不会旋转 在保存之前先保存，然后再保存

• 只需在JPEG的EXIF数据中设置旋转标志。如果将UIImage保存为JPEG
• 它将设置旋转标志。PNG不支持旋转标志
• 因此，如果将UIImage保存为PNG，它将被错误地旋转，并且没有设置用于修复它的标志。所以如果你想要PNG图像，你必须 自己旋转它们

从iOS 4.0开始，相机拍照时不会旋转 在保存之前先保存，然后再保存

• 只需在JPEG的EXIF数据中设置旋转标志。如果将UIImage保存为JPEG
• 它将设置旋转标志。PNG不支持旋转标志
• 因此，如果将UIImage保存为PNG，它将被错误地旋转，并且没有设置用于修复它的标志。所以如果你想要PNG图像，你必须 自己旋转它们

---

你能发布你用来显示图像的代码吗？最好知道您在这里使用的是哪种视图层次结构。好的，我会…@ev350请检查您能发布用于显示图像的代码吗？最好知道您在这里使用的是哪种视图层次结构。好的，我会…@ev350请检查谢谢您的答复，但使用您的解决方案时也会出现同样的问题，请检查我更新的问题以了解更多信息您在将图像设置到Imageview时是否尝试过上述方法？这应该是imageView.image=capturedImage.fixOrientation（），谢谢您的回复，但使用您的解决方案时也会出现同样的问题，请查看我更新的问题以了解更多信息在将图像设置到imageView中时，您是否尝试过上述方法？这应该是imageView.image=capturedImage.fixOrientation（）什么是

ImageRenderFormat

？什么是

ImageRenderFormat

？