[英]Swift - AVFoundation capture image orientation
我有一個自定義相機,可以在人像模式下拍照。
我的問題是,如果我嘗試拍攝橫向照片並保存,那么照片仍會以縱向模式保存。
我有這個 function 來設置預覽層:
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 中調用它(我認為這不是正確的做法)。
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)
}
並使用此擴展名:
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)
}
}
}
只要我拍攝肖像模式照片,一切都很好,但是當我旋轉手機拍攝風景照片時,照片仍然以肖像模式拍攝。
這是我第一次使用自定義相機,我真的不知道從哪里開始解決這個問題……如果有人能提供幫助,我將不勝感激。
謝謝!
--------------更新我已經添加了這個 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
}
並將我的擴展名更改為此:
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)
}
}
}
圖像以正確的方向顯示在預覽中,但是當我保存它時它會變成縱向...
我遇到了類似的問題,並根據所拍攝的照片生成了新圖像來解決此問題:
UIGraphicsBeginImageContextWithOptions(image.size, false, image.scale)
image.draw(in: CGRect(origin: .zero, size: image.size))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
顯然,iOS生成的圖像元數據(包括方向)不完整,某些查看器(在我的情況下為Chrome和Safari瀏覽器)無法正確呈現圖像。 通過重新渲染,似乎已為所有查看者正確設置了元數據。
請注意,1)在我的應用程序中,我還縮小了圖像的比例(雖然我認為這不會改變效果),以及2)我通過其他方式(即UIImagePickerController
)捕獲圖像; 不過,您仍然可以嘗試修改我的hacky。
您需要在調用capturePhoto()之前運行以下代碼
if let photoOutputConnection = CustomCamera.photoOutput.connection(with: AVMediaType.video) {
photoOutputConnection.videoOrientation = videoDeviceOrientation
}
您可以使用managePhotoOrientation()函數獲取videoDeviceOrientation。
Swift 4.2最新的AVFoundation語法捕獲圖像方向(經過測試的代碼)。
UIGraphicsBeginImageContextWithOptions((image?.size)!, false, (image?.scale)!)
image?.draw(in: CGRect(origin: .zero, size: (image?.size)!))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
基於dr_barto源代碼,我為UIImage寫了一個擴展:
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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