iOS Swift 3图像向左旋转90度

Question

In my app I have a feature to take a picture from camera and upload it to server. My problem is that when I'm getting response back from server that image is rotating to 90 degree left side. Here is my tried code:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    self.PickerFrom = self.PickerFrom2
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage
    {
       self.AttachmentImageView.image = pickedImage
    }
    dismiss(animated: true, completion: nil)
    uploadGalleryImage(image: self.AttachmentImageView.image!)
}

func uploadGalleryImage( image:UIImage)
{
    let imageData: NSData = UIImagePNGRepresentation(image)! as NSData
    let base64String = imageData.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
    self.AttachedDocumentURL = "data:image/png;base64,\(base64String)"
}

AttachedDocumentURL contains base64sting of captured image.

Answer 1

Try this (reset you image orientation) before you upload on server

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    self.PickerFrom = self.PickerFrom2
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage
    {
       self.AttachmentImageView.image = pickedImage
    }
    dismiss(animated: true, completion: nil)

    if let updatedImage = self.AttachmentImageView.image?.updateImageOrientionUpSide() {
      uploadGalleryImage(image: updatedImage)
    } else {
      uploadGalleryImage(image: self.AttachmentImageView.image!)
    }

}

func uploadGalleryImage( image:UIImage)
{
    let imageData: NSData = UIImagePNGRepresentation(image)! as NSData
    let base64String = imageData.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
    self.AttachedDocumentURL = "data:image/png;base64,\(base64String)"
}

// Image extension
extension UIImage {

    func updateImageOrientionUpSide() -> UIImage? {
        if self.imageOrientation == .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))
        if let normalizedImage:UIImage = UIGraphicsGetImageFromCurrentImageContext() {
            UIGraphicsEndImageContext()
            return normalizedImage
        }
        UIGraphicsEndImageContext()
        return nil
    }
}

Answer 2

Use this common function to fix upside image orientation from any.

extension UIImage {

    func fixImageOrientation() -> UIImage? {


        if (self.imageOrientation == .up) {
            return self
        }

        var transform: CGAffineTransform = CGAffineTransform.identity


        if ( self.imageOrientation == .left || self.imageOrientation == .leftMirrored ) {
            transform = transform.translatedBy(x: self.size.width, y: 0)
            transform = transform.rotated(by: CGFloat(Double.pi / 2.0))
        } else if ( self.imageOrientation == .right || self.imageOrientation == .rightMirrored ) {
            transform = transform.translatedBy(x: 0, y: self.size.height);
            transform = transform.rotated(by: CGFloat(-Double.pi / 2.0));
        } else if ( self.imageOrientation == .down || self.imageOrientation == .downMirrored ) {
            transform = transform.translatedBy(x: self.size.width, y: self.size.height)
            transform = transform.rotated(by: CGFloat(Double.pi))
        } else if ( self.imageOrientation == .upMirrored || self.imageOrientation == .downMirrored ) {
            transform = transform.translatedBy(x: self.size.width, y: 0)
            transform = transform.scaledBy(x: -1, y: 1)
        } else if ( self.imageOrientation == .leftMirrored || self.imageOrientation == .rightMirrored ) {
            transform = transform.translatedBy(x: self.size.height, y: 0);
            transform = transform.scaledBy(x: -1, y: 1);
        }


        if let context: CGContext = CGContext(data: nil, width: Int(self.size.width), height: Int(self.size.height),
                                       bitsPerComponent: self.cgImage!.bitsPerComponent, bytesPerRow: 0,
                                       space: self.cgImage!.colorSpace!,
                                       bitmapInfo: self.cgImage!.bitmapInfo.rawValue) {

            context.concatenate(transform)

            if ( self.imageOrientation == UIImageOrientation.left ||
                self.imageOrientation == UIImageOrientation.leftMirrored ||
                self.imageOrientation == UIImageOrientation.right ||
                self.imageOrientation == UIImageOrientation.rightMirrored ) {
                context.draw(self.cgImage!, in: CGRect(x: 0,y: 0,width: self.size.height,height: self.size.width))
            } else {
                context.draw(self.cgImage!, in: CGRect(x: 0,y: 0,width: self.size.width,height: self.size.height))
            }

            if let contextImage = context.makeImage() {
                return UIImage(cgImage: contextImage)
            }

        }

        return nil
    }
}

Answer 3

Swift 4.1 compatible. This extension avoids sending image exif data on the iOS device side.

extension UIImage {

    func fixOrientation() -> UIImage? {

        if (imageOrientation == .up) { return self }

        var transform = CGAffineTransform.identity

        switch imageOrientation {
        case .left, .leftMirrored:
            transform = transform.translatedBy(x: size.width, y: 0.0)
            transform = transform.rotated(by: .pi / 2.0)
        case .right, .rightMirrored:
            transform = transform.translatedBy(x: 0.0, y: size.height)
            transform = transform.rotated(by: -.pi / 2.0)
        case .down, .downMirrored:
            transform = transform.translatedBy(x: size.width, y: size.height)
            transform = transform.rotated(by: .pi)
        default:
            break
        }

        switch imageOrientation {
        case .upMirrored, .downMirrored:
            transform = transform.translatedBy(x: size.width, y: 0.0)
            transform = transform.scaledBy(x: -1.0, y: 1.0)
        case .leftMirrored, .rightMirrored:
            transform = transform.translatedBy(x: size.height, y: 0.0)
            transform = transform.scaledBy(x: -1.0, y: 1.0)
        default:
            break
        }

        guard let cgImg = cgImage else { return nil }

        if let context = CGContext(data: nil,
                                   width: Int(size.width), height: Int(size.height),
                                   bitsPerComponent: cgImg.bitsPerComponent,
                                   bytesPerRow: 0, space: cgImg.colorSpace!,
                                   bitmapInfo: cgImg.bitmapInfo.rawValue) {

            context.concatenate(transform)

            if imageOrientation == .left || imageOrientation == .leftMirrored ||
                imageOrientation == .right || imageOrientation == .rightMirrored {
                context.draw(cgImg, in: CGRect(x: 0.0, y: 0.0, width: size.height, height: size.width))
            } else {
                context.draw(cgImg, in: CGRect(x: 0.0 , y: 0.0, width: size.width, height: size.height))
            }

            if let contextImage = context.makeImage() {
                return UIImage(cgImage: contextImage)
            }

        }

        return nil
    }

}