实例成员 'fileDataRepresentation' 不能用于类型 'AVCapturePhoto'；您的意思是改用这种类型的值吗？

Question

Swift 给出无法为 AVCapturePhoto 创建 fileDataRepresentation 的错误。正在打印“照片”，returns 照片的元数据。如何将图像转换为文件字节并最终转换为 base64？到目前为止，我尝试了很多方法，但都依赖于获取文件字节。感谢您提前回复！

   @IBAction func takePhotoButtonPressed(_ sender: Any) {
          let settings = AVCapturePhotoSettings()
          let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
          let previewFormat = [kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
                               kCVPixelBufferWidthKey as String: 160,
                               kCVPixelBufferHeightKey as String: 160]
          settings.previewPhotoFormat = previewFormat
          settings.isHighResolutionPhotoEnabled = false
          sessionOutput.capturePhoto(with: settings, delegate: self)
        
    }

    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Swift.Error?) {
        let imageData = AVCapturePhoto.fileDataRepresentation()

Answer 1

AVCapturePhoto.fileDataRepresentation 是一种 instance 方法，而不是 class 方法。

你必须像这样在 AVCapturePhoto 的实例上调用它 -

func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Swift.Error?) {
    let imageData = photo.fileDataRepresentation()
}

实例成员 'fileDataRepresentation' 不能用于类型 'AVCapturePhoto'；您的意思是改用这种类型的值吗？

Instance member 'fileDataRepresentation' cannot be used on type 'AVCapturePhoto'; did you mean to use a value of this type instead?

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