问题
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.
回答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
}
}
回答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
}
}
回答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
}
}
来源：https://stackoverflow.com/questions/45324544/ios-swift-3-image-rotated-90-degrees-left