ios – 当火炬打开时,AVCaptureSession冻结

我们的iOS应用程序具有条形码扫描功能,我们可以让客户根据需要打开和关闭手电筒.在AvcaptureSession运行且手电筒启用时,在iPhone X上(仅在iPhone X上),屏幕上的视频捕获会冻结.只要再次关闭手电筒,视频捕捉就会再次开始.有没有人碰到这个?我似乎无法找到任何指向解决方案的东西.想知道这是否是iPhone X的错误? 最佳答案 我遇到了这个问题.经过一些实验,结果表明获得配置火炬的设备必须以与配置AVCaptureSession时获得设备完全相同的方式完成.例如.:

    let captureSession = AVCaptureSession()
    let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera], mediaType: AVMediaType.video, position: .back)

        guard let captureDevice = deviceDiscoverySession.devices.first else {
            print("Couldn't get a camera")
            return
        }
     do {
            let input = try AVCaptureDeviceInput(device: captureDevice)
            captureSession!.addInput(input)
        } catch {
            print(error)
            return
        }

打开和关闭割炬(手电筒)时,使用该精确方法获取设备.在这种情况下,行:

let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera], mediaType: AVMediaType.video, position: .back)

guard let device = deviceDiscoverySession.devices.first

例:

func toggleTorch() {

    let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera], mediaType: AVMediaType.video, position: .back)

    guard let device = deviceDiscoverySession.devices.first
        else {return}

    if device.hasTorch {
        do {
            try device.lockForConfiguration()
            let on = device.isTorchActive
            if on != true && device.isTorchModeSupported(.on) {
                try device.setTorchModeOn(level: 1.0)
            } else if device.isTorchModeSupported(.off){
                device.torchMode = .off
            } else {
                print("Torch mode is not supported")
            }
            device.unlockForConfiguration()
        } catch {
            print("Torch could not be used")
        }
    } else {
        print("Torch is not available")
    }
}

我意识到toggleTorch函数中的某些代码可能是多余的,但我要离开它了.希望这可以帮助.

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