[英]Not able to Open a Camera for iOS
我正在尝试为应用程序创建条形码阅读器功能。 为此,我无法获得任何相机设备。
我正在使用AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera], mediaType: AVMediaType.video, position:. back)
来获取设备列表。
我想从上面的列表中获取第一个设备
但它不会返回任何相机。
我还在info.plist
添加了一个隐私 - 相机使用说明
func viewDidLoad() {
let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera], mediaType: AVMediaType.video, position:. back)
guard let captureDevice = deviceDiscoverySession.devices.first else{
print("Failed to get the camera device")
return
}
do{
// get an instance of the AVCaptureDeviceInput class using the previous device object
let input = try AVCaptureDeviceInput(device: captureDevice)
//Set the input device on the capture session
captureSession?.addInput(input)
// Initialize a AVCaptureMetadataOutput object and set it as the output device to the capture session
let captureMetadataOutput = AVCaptureMetadataOutput()
captureSession?.addOutput(captureMetadataOutput)
//Set delegate and use the default dispatch queue to execute the call back
captureMetadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
captureMetadataOutput.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]
//Initialize the video preview layer and add it as a subLayer to the viewPreview view
videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession!)
videoPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
videoPreviewLayer?.frame = view.layer.bounds
view.layer.addSublayer(videoPreviewLayer!)
//Start video capture.
captureSession?.startRunning()
} catch {
// if any error occurs, print it out and don't continue any more
print(error)
return
}
}
我希望它可以启动相机; 但是,它反过来给我以下错误:
2019-05-05 16:17:46.609442-0500 BarCode [964:302791] [MC] systemgroup.com.apple.configurationprofiles路径的系统组容器是/private/var/containers/Shared/SystemGroup/systemgroup.com.apple .configurationprofiles
2019-05-05 16:17:46.609962-0500 BarCode [964:302791] [MC]从公共有效用户设置中读取。
无法获得相机设备。
它可能就像错误提到的那样。 没有任何.builtInDualCamera
选项可用于该设备。
您可以尝试的普通相机类型
let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: AVMediaType.video, position: .back)
如果你确实需要.builtInDualCamera
,你可以按照Apple文档建议的那样执行if...else
检查后备计划。
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