ios - AVCapturePhotoOutput : If you specify a non-nil format dictionary in your settings, 您的代表必须响应选择器

Question

@IBAction func clickPicture(_ sender: UIButton) {

       let photoSettings = AVCapturePhotoSettings()
        photoSettings.flashMode = .auto
        photoSettings.isHighResolutionPhotoEnabled = true
        if photoSettings.availablePreviewPhotoPixelFormatTypes.count > 0 {
            photoSettings.previewPhotoFormat = [kCVPixelBufferPixelFormatTypeKey as String : photoSettings.availablePreviewPhotoPixelFormatTypes.first!]
        }

        self.wideAngleOutPut.capturePhoto(with: photoSettings, delegate: self)
    }

当我调用上面的函数来捕获在线抛出异常的图像应用程序时:self.wideAngleOutPut.capturePhoto(with: photoSettings, delegate: self)

在日志部分，我可以看到更详细的错误及其类似内容:

由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因:“* **-[AVCapturePhotoOutput capturePhotoWithSettings:delegate:] 如果您在设置中指定了非零格式字典，则您的代理必须响应选择器****

有人可以帮忙吗？提前致谢。

Answer 1

如果设置了 previewPhotoFormat，则需要在委托(delegate)中实现以下内容。

func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?)

我猜这是因为这是在这种情况下访问预览的唯一方式。