Swift 尝试使用AVCapturePhotoOutput捕获照片时，图像变暗

我正在尝试使用AVCapturePhotoOutput捕捉照片，但图像变暗。下面是我如何获得图像的

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遇到同样的问题，并在另一个堆栈溢出线程上发现此问题，添加它对我有效：）

session.sessionPreset=AVCaptureSession.Preset.photo

这里是讨论的链接

希望这有帮助

@IBAction func capturephoto(_ sender: Any) {
    print("entered into capture photo")

    let settings = AVCapturePhotoSettings()
    let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
    let previewFormat = [
        kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
        kCVPixelBufferWidthKey as String: self.preivew.frame.width,
        kCVPixelBufferHeightKey as String: self.preivew.frame.height
    ] as [String : Any]
    settings.previewPhotoFormat = previewFormat
    captureSession.addOutput(stillImageOutput)
    print("stillimageoutput is",stillImageOutput)
    self.stillImageOutput.capturePhoto(with: settings, delegate: self)
}


func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {

    if let error = error {
        print(error.localizedDescription)
    }
    let imageData = photo.fileDataRepresentation()
    if let data = imageData, let img = UIImage(data: data) {
        print(img)
     }
 }