Camera view rotate 90 degree in Swift - ios

Question

When I'm making a customized camera app in Swift.
But when I try to access the camera, the view in camera rotated 90 degrees. I try to find the solution. One solution I find is adding a fixOrientation function to fix the view. But not working...
Here is my full code:
let CIHueAdjust = "CIHueAdjust"
let CIHueAdjustFilter = CIFilter(name: "CIHueAdjust", withInputParameters: ["inputAngle" : 1.24])
let Filters = [CIHueAdjust: CIHueAdjustFilter]
let FilterNames = [String](Filters.keys).sort()
class LiveCamViewController : UIViewController,AVCaptureVideoDataOutputSampleBufferDelegate{
let mainGroup = UIStackView()
let imageView = UIImageView(frame: CGRectZero)
let filtersControl = UISegmentedControl(items: FilterNames)
override func viewDidLoad()
{
super.viewDidLoad()
view.addSubview(mainGroup)
mainGroup.axis = UILayoutConstraintAxis.Vertical
mainGroup.distribution = UIStackViewDistribution.Fill
mainGroup.addArrangedSubview(imageView)
mainGroup.addArrangedSubview(filtersControl)
imageView.contentMode = UIViewContentMode.ScaleAspectFit
filtersControl.selectedSegmentIndex = 0
let captureSession = AVCaptureSession()
captureSession.sessionPreset = AVCaptureSessionPresetPhoto
let backCamera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
do
{
let input = try AVCaptureDeviceInput(device: backCamera)
captureSession.addInput(input)
}
catch
{
print("can't access camera")
return
}
//get captureOutput invoked
let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
view.layer.addSublayer(previewLayer)
let videoOutput = AVCaptureVideoDataOutput()
videoOutput.setSampleBufferDelegate(self, queue: dispatch_queue_create("sample buffer delegate", DISPATCH_QUEUE_SERIAL))
if captureSession.canAddOutput(videoOutput)
{
captureSession.addOutput(videoOutput)
}
captureSession.startRunning()
}
func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!)
{
guard let filter = Filters[FilterNames[filtersControl.selectedSegmentIndex]] else
{
return
}
let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)
let cameraImage = CIImage(CVPixelBuffer: pixelBuffer!)
filter!.setValue(cameraImage, forKey: kCIInputImageKey)
let filteredImage = UIImage(CIImage: filter!.valueForKey(kCIOutputImageKey) as! CIImage!)
let fixedImage = fixOrientation(filteredImage)
dispatch_async(dispatch_get_main_queue())
{
self.imageView.image = fixedImage
}
}
func fixOrientation(image: UIImage) -> UIImage {
if (image.imageOrientation == UIImageOrientation.Up) {
return image;
}
print(image.imageOrientation)
var transform = CGAffineTransformIdentity
switch (image.imageOrientation) {
case .Down, .DownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, image.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI))
break
case .Left, .LeftMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2))
break
case .Right, .RightMirrored:
transform = CGAffineTransformTranslate(transform, 0, image.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2))
break
case .Up, .UpMirrored:
break
}
switch (image.imageOrientation) {
case .UpMirrored, .DownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0)
transform = CGAffineTransformScale(transform, -1, 1)
break
case .LeftMirrored, .RightMirrored:
transform = CGAffineTransformTranslate(transform, image.size.height, 0)
transform = CGAffineTransformScale(transform, -1, 1)
break
case .Up, .Down, .Left, .Right:
break
}
//Draw the underlying CGImage into a new context, applying the transform
let ctx = CGBitmapContextCreate(nil, Int(image.size.width), Int(image.size.height), CGImageGetBitsPerComponent(image.CGImage), 0, CGImageGetColorSpace(image.CGImage), UInt32(CGImageGetBitmapInfo(image.CGImage).rawValue))
CGContextConcatCTM(ctx, transform);
switch (image.imageOrientation) {
case .Left, .LeftMirrored, .Right, .RightMirrored:
CGContextDrawImage(ctx, CGRectMake(0, 0, image.size.height, image.size.width), image.CGImage)
break
default:
CGContextDrawImage(ctx, CGRectMake(0, 0, image.size.width, image.size.height), image.CGImage)
break
}
let cgimg = CGBitmapContextCreateImage(ctx)
let img = UIImage(CGImage:cgimg!)
return img
}
override func viewDidLayoutSubviews()
{
mainGroup.frame = CGRect(x: 37, y: 115, width: 301, height: 481)
}
}
I set a breakpoint to test, the code seems only run until
if (image.imageOrientation == UIImageOrientation.Up) {
return image;
}
then it returns the same view...
Can anyone help me?
Thanks!!!

Answer 1

In capture() where you get your CIImage from CMSampleBuffer do this after:
yourCIImage = yourCIImage.applyingOrientation(6)
Change the number from 1-8 depending on how you want to rotate and mirror.
https://developer.apple.com/documentation/imageio/kcgimagepropertyorientation

Answer 2

For those who need the code from #LoVo in Swift 3:
func rotateCameraImageToProperOrientation(imageSource : UIImage, maxResolution : CGFloat) -> UIImage {
guard let imgRef = imageSource.cgImage else {
return imageSource
}
let width = CGFloat(imgRef.width);
let height = CGFloat(imgRef.height);
var bounds = CGRect(x: 0, y: 0, width: width, height: height)
var scaleRatio : CGFloat = 1
if (width > maxResolution || height > maxResolution) {
scaleRatio = min(maxResolution / bounds.size.width, maxResolution / bounds.size.height)
bounds.size.height = bounds.size.height * scaleRatio
bounds.size.width = bounds.size.width * scaleRatio
}
var transform = CGAffineTransform.identity
let orient = imageSource.imageOrientation
let imageSize = CGSize(width: CGFloat(imgRef.width), height: CGFloat(imgRef.height))
switch(imageSource.imageOrientation) {
case .up :
transform = CGAffineTransform.identity
case .upMirrored :
transform = CGAffineTransform(translationX: imageSize.width, y: 0.0)
transform = transform.scaledBy(x: -1.0, y: 1.0)
case .down :
transform = CGAffineTransform(translationX: imageSize.width, y: imageSize.height)
transform = transform.rotated(by: CGFloat(M_PI))
case .downMirrored :
transform = CGAffineTransform(translationX: 0.0, y: imageSize.height)
transform = transform.scaledBy(x: 1.0, y: -1.0)
case .left :
let storedHeight = bounds.size.height
bounds.size.height = bounds.size.width
bounds.size.width = storedHeight
transform = CGAffineTransform(translationX: 0.0, y: imageSize.width)
transform = transform.rotated(by: 3.0 * CGFloat(M_PI) / 2.0)
case .leftMirrored :
let storedHeight = bounds.size.height
bounds.size.height = bounds.size.width
bounds.size.width = storedHeight
transform = CGAffineTransform(translationX: imageSize.height, y: imageSize.width)
transform = transform.scaledBy(x: -1.0, y: 1.0)
transform = transform.rotated(by: 3.0 * CGFloat(M_PI) / 2.0)
case .right :
let storedHeight = bounds.size.height
bounds.size.height = bounds.size.width
bounds.size.width = storedHeight
transform = CGAffineTransform(translationX: imageSize.height, y: 0.0)
transform = transform.rotated(by: CGFloat(M_PI) / 2.0)
case .rightMirrored :
let storedHeight = bounds.size.height
bounds.size.height = bounds.size.width
bounds.size.width = storedHeight
transform = CGAffineTransform(scaleX: -1.0, y: 1.0)
transform = transform.rotated(by: CGFloat(M_PI) / 2.0)
}
UIGraphicsBeginImageContext(bounds.size)
guard let context = UIGraphicsGetCurrentContext() else {
return imageSource
}
if orient == .right || orient == .left {
context.scaleBy(x: -scaleRatio, y: scaleRatio)
context.translateBy(x: -height, y: 0)
} else {
context.scaleBy(x: scaleRatio, y: -scaleRatio)
context.translateBy(x: 0, y: -height)
}
context.concatenate(transform);
context.draw(imgRef, in: CGRect(x: 0, y: 0, width: width, height: height))
guard let imageCopy = UIGraphicsGetImageFromCurrentImageContext() else {
return imageSource
}
UIGraphicsEndImageContext();
return imageCopy;
}

Answer 3

Try this method instead: (taken from here)
import Darwin
class func rotateCameraImageToProperOrientation(imageSource : UIImage, maxResolution : CGFloat) -> UIImage {
let imgRef = imageSource.CGImage;
let width = CGFloat(CGImageGetWidth(imgRef));
let height = CGFloat(CGImageGetHeight(imgRef));
var bounds = CGRectMake(0, 0, width, height)
var scaleRatio : CGFloat = 1
if (width > maxResolution || height > maxResolution) {
scaleRatio = min(maxResolution / bounds.size.width, maxResolution / bounds.size.height)
bounds.size.height = bounds.size.height * scaleRatio
bounds.size.width = bounds.size.width * scaleRatio
}
var transform = CGAffineTransformIdentity
let orient = imageSource.imageOrientation
let imageSize = CGSizeMake(CGFloat(CGImageGetWidth(imgRef)), CGFloat(CGImageGetHeight(imgRef)))
switch(imageSource.imageOrientation) {
case .Up :
transform = CGAffineTransformIdentity
case .UpMirrored :
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
case .Down :
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, CGFloat(M_PI));
case .DownMirrored :
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
case .Left :
let storedHeight = bounds.size.height
bounds.size.height = bounds.size.width;
bounds.size.width = storedHeight;
transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
transform = CGAffineTransformRotate(transform, 3.0 * CGFloat(M_PI) / 2.0);
case .LeftMirrored :
let storedHeight = bounds.size.height
bounds.size.height = bounds.size.width;
bounds.size.width = storedHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
transform = CGAffineTransformRotate(transform, 3.0 * CGFloat(M_PI) / 2.0);
case .Right :
let storedHeight = bounds.size.height
bounds.size.height = bounds.size.width;
bounds.size.width = storedHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
transform = CGAffineTransformRotate(transform, CGFloat(M_PI) / 2.0);
case .RightMirrored :
let storedHeight = bounds.size.height
bounds.size.height = bounds.size.width;
bounds.size.width = storedHeight;
transform = CGAffineTransformMakeScale(-1.0, 1.0);
transform = CGAffineTransformRotate(transform, CGFloat(M_PI) / 2.0);
default : ()
}
UIGraphicsBeginImageContext(bounds.size)
let context = UIGraphicsGetCurrentContext()
if orient == .Right || orient == .Left {
CGContextScaleCTM(context, -scaleRatio, scaleRatio);
CGContextTranslateCTM(context, -height, 0);
} else {
CGContextScaleCTM(context, scaleRatio, -scaleRatio);
CGContextTranslateCTM(context, 0, -height);
}
CGContextConcatCTM(context, transform);
CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imgRef);
let imageCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return imageCopy;
}