Ios AVCaptureDevice微光增强swift

有人知道如何为ios摄像头应用程序设置微光增强吗？这是我的代码，但无法正常工作

let backCamera = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
    do {
                try backCamera?.lockForConfiguration()
                if (backCamera?.isLowLightBoostSupported == true) {
                   backCamera?.automaticallyEnablesLowLightBoostWhenAvailable = true
                }
                 backCamera?.unlockForConfiguration()
                 }
                 catch{
                     print(error)
                 }

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你不需要这个。将其放入didMoveToView：

captureSession!.sessionPreset = AVCaptureSessionPresetPhoto