Swift 3.0 打开手机手电筒

概述@IBAction func lightButtonClick(_ sender: UIButton) { let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) if device == nil { sender.isEnabled = fals

@IBAction func lightbuttonClick(_ sender: UIbutton) {        let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVIDeo)        if device == nil {            sender.isEnabled = false            return        }        if device?.torchMode == AVCapturetorchMode.off{            do {                try device?.lockForConfiguration()            } catch {                return            }            device?.torchMode = .on            device?.unlockForConfiguration()            sender.isSelected = true        }else {            do {                try device?.lockForConfiguration()            } catch {                return            }            device?.torchMode = .off            device?.unlockForConfiguration()            sender.isSelected = false        }    }

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