Question

我正在关注有关CoreML的Youtube教程：使用机器学习进行实时相机对象检测 - Brian先生的Swift 4

captureSession.sessionPreset = .photo

在这一行中，错误说明：

类型“字符串”没有成员'photo'。

dataOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))

另一个错误是'自我'部分。错误是：

无法将'ViewController'类型的值转换为预期的参数类型'AVCaptureVideoDataOutputSampleBufferDelegate！'

以下是整个代码：

import UIKit
import AVFoundation
import AVKit
import Vision

class ViewController: UIViewController,         AVCaptureAudioDataOutputSampleBufferDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()

        // here is where we start up the camera
        let captureSession = AVCaptureSession()
        captureSession.sessionPreset = .photo

        guard let captureDevice =
            AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) else { return }

        guard let input = try? AVCaptureDeviceInput(device:
            captureDevice) else { return }
        captureSession.addInput(input)

        captureSession.startRunning()

        let previewLayer = AVCaptureVideoPreviewLayer(session:
            captureSession)
        view.layer.addSublayer(previewLayer!)
        previewLayer!.frame = view.frame

        let dataOutput = AVCaptureVideoDataOutput()
        dataOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
        captureSession.addOutput(dataOutput)

Answer 1

我认为你得到了第二个错误的答案，因为第一个错误用下面的错误行替换

SWIFT 3

captureSession.sessionPreset = AVCaptureSessionPresetPhoto

SWIFT 4

captureSession.sessionPreset = AVCaptureSession.Preset.photo

输入'String！'没有会员'photo'

1 个答案: