Question

在我的应用中，我有一项功能可以从camera拍摄照片并将其上传到服务器。我的问题是，当我从服务器得到响应时，图像旋转到90度左侧。这是我尝试过的代码：

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包含捕获图像的base64sting。

Answer 1

在服务器上传之前尝试此操作（重置图像方向）

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

使用此常用功能可以修复任何上方的图像方向。

 xmlns:app="http://schemas.android.com/apk/res-auto"

Answer 3

Swift 4.1兼容。此扩展程序可避免在iOS设备端发送图像exif数据。

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
    }

}

iOS Swift 3图像向左旋转90度

3 个答案: