Question

如何在Mac OS Mojave的Swift游乐场中访问相机？过去在High Sierra上可以正常使用，但是代码似乎无法正确执行，因为操场上的运行符号不断旋转，并且相机灯不亮。

我得到了一个示例代码，该代码去年可以正常工作，但今天不再可用了，有人知道出了什么问题以及如何解决它吗？

import Cocoa
import AVFoundation
import AVKit
import QuartzCore
import PlaygroundSupport

let view = NSView(frame: NSRect(x: 0.0, y: 0.0, width: 640.0, height: 480.0))

let session = AVCaptureSession()

session.sessionPreset = AVCaptureSession.Preset.vga640x480
session.beginConfiguration()
session.commitConfiguration()


var input : AVCaptureDeviceInput
if let devices : [AVCaptureDevice] = AVCaptureDevice.devices() as? [AVCaptureDevice] {
for device in devices {
    if device.hasMediaType(AVMediaType.video) && device.supportsSessionPreset(AVCaptureSession.Preset.vga640x480) {
        do {
            input = try AVCaptureDeviceInput(device: device as AVCaptureDevice) as AVCaptureDeviceInput

            if session.canAddInput(input) {
                session.addInput(input)
                break
            }
        }
        catch {
            error
        }
    }
}

let output = AVCaptureVideoDataOutput()
output.videoSettings = [kCVPixelBufferPixelFormatTypeKey as AnyHashable as! String: Int(kCVPixelFormatType_32BGRA)]
output.alwaysDiscardsLateVideoFrames = true

if session.canAddOutput(output) {
    session.addOutput(output)
}

let captureLayer = AVCaptureVideoPreviewLayer(session: session)
view.wantsLayer = true
view.layer = captureLayer

session.startRunning()

//View -> Assistant Editor -> Show Assistant Editor
PlaygroundPage.current.liveView = view

}

查看了关于如何请求访问我尝试过的相机的苹果文档，但是它似乎在操场上不起作用，因为实施该相机时我仍然遇到相同的问题。

https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/requesting_authorization_for_media_capture_on_macos

switch AVCaptureDevice.authorizationStatus(for: .video) {
case .authorized: // The user has previously granted access to the camera.
    self.setupCaptureSession()

case .notDetermined: // The user has not yet been asked for camera access.
    AVCaptureDevice.requestAccess(for: .video) { granted in
        if granted {
            self.setupCaptureSession()
        }
    }

case .denied: // The user has previously denied access.
    return
case .restricted: // The user can't grant access due to restrictions.
    return
}

如何在Mac OS Mojave Swift游乐场中访问相机

0 个答案: