[英]Swift - AVFoundation capture image orientation
我有一个自定义相机,可以在人像模式下拍照。
我的问题是,如果我尝试拍摄横向照片并保存,那么照片仍会以纵向模式保存。
我有这个 function 来设置预览层:
static func setupPreviewLayer(view: UIView) {
cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
switch UIDevice.current.orientation {
case .portrait:
cameraPreviewLayer?.connection?.videoOrientation =
AVCaptureVideoOrientation.portrait
case .portraitUpsideDown:
cameraPreviewLayer?.connection?.videoOrientation =
AVCaptureVideoOrientation.portraitUpsideDown
case .landscapeLeft:
cameraPreviewLayer?.connection?.videoOrientation =
AVCaptureVideoOrientation.landscapeLeft
case .landscapeRight:
cameraPreviewLayer?.connection?.videoOrientation =
AVCaptureVideoOrientation.landscapeRight
default:
cameraPreviewLayer?.connection?.videoOrientation =
AVCaptureVideoOrientation.portrait
}
cameraPreviewLayer?.frame = view.frame
view.layer.insertSublayer(cameraPreviewLayer!, at: 0)
}
我在 viewWillAppear 中调用它(我认为这不是正确的做法)。
然后我拍照:
@IBAction func takePhotoBtnPressed(_ sender: Any) {
let settings = AVCapturePhotoSettings()
useFlash(settings: settings)
settings.isAutoStillImageStabilizationEnabled = true
CustomCamera.photoOutput?.capturePhoto(with: settings, delegate: self)
}
并使用此扩展名:
extension FishCameraVC: AVCapturePhotoCaptureDelegate {
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let imageData = photo.fileDataRepresentation() {
image = UIImage(data: imageData)
performSegue(withIdentifier: "ShowTakenPhoto", sender: nil)
}
}
}
只要我拍摄肖像模式照片,一切都很好,但是当我旋转手机拍摄风景照片时,照片仍然以肖像模式拍摄。
这是我第一次使用自定义相机,我真的不知道从哪里开始解决这个问题……如果有人能提供帮助,我将不胜感激。
谢谢!
--------------更新我已经添加了这个 function:
func managePhotoOrientation() -> UIImageOrientation {
var currentDevice: UIDevice
currentDevice = .current
UIDevice.current.beginGeneratingDeviceOrientationNotifications()
var deviceOrientation: UIDeviceOrientation
deviceOrientation = currentDevice.orientation
var imageOrientation: UIImageOrientation!
if deviceOrientation == .portrait {
imageOrientation = .up
print("Device: Portrait")
}else if (deviceOrientation == .landscapeLeft){
imageOrientation = .left
print("Device: LandscapeLeft")
}else if (deviceOrientation == .landscapeRight){
imageOrientation = .right
CustomCamera.cameraPreviewLayer?.connection?.videoOrientation = .landscapeRight
print("Device LandscapeRight")
}else if (deviceOrientation == .portraitUpsideDown){
imageOrientation = .down
print("Device PortraitUpsideDown")
}else{
imageOrientation = .up
}
return imageOrientation
}
并将我的扩展名更改为此:
extension FishCameraVC: AVCapturePhotoCaptureDelegate {
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let imageData = photo.fileDataRepresentation() {
image = UIImage(data: imageData)
let dataProvider = CGDataProvider(data: imageData as CFData)
let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
self.image = UIImage(cgImage: cgImageRef!, scale: 1.0, orientation: imageOrientation!)
performSegue(withIdentifier: "ShowTakenPhoto", sender: nil)
}
}
}
图像以正确的方向显示在预览中,但是当我保存它时它会变成纵向...
我遇到了类似的问题,并根据所拍摄的照片生成了新图像来解决此问题:
UIGraphicsBeginImageContextWithOptions(image.size, false, image.scale)
image.draw(in: CGRect(origin: .zero, size: image.size))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
显然,iOS生成的图像元数据(包括方向)不完整,某些查看器(在我的情况下为Chrome和Safari浏览器)无法正确呈现图像。 通过重新渲染,似乎已为所有查看者正确设置了元数据。
请注意,1)在我的应用程序中,我还缩小了图像的比例(虽然我认为这不会改变效果),以及2)我通过其他方式(即UIImagePickerController
)捕获图像; 不过,您仍然可以尝试修改我的hacky。
您需要在调用capturePhoto()之前运行以下代码
if let photoOutputConnection = CustomCamera.photoOutput.connection(with: AVMediaType.video) {
photoOutputConnection.videoOrientation = videoDeviceOrientation
}
您可以使用managePhotoOrientation()函数获取videoDeviceOrientation。
Swift 4.2最新的AVFoundation语法捕获图像方向(经过测试的代码)。
UIGraphicsBeginImageContextWithOptions((image?.size)!, false, (image?.scale)!)
image?.draw(in: CGRect(origin: .zero, size: (image?.size)!))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
基于dr_barto源代码,我为UIImage写了一个扩展:
extension UIImage {
var orientationCorrectedImage: UIImage? {
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
self.draw(in: CGRect(origin: .zero, size: self.size))
let result = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return result
}
}
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