swift 燈光的開啟與關閉

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func lightBtnAction(sender: UIButton){                let device = AVCaptureDevice.default(for:.video)        if device == nil {            sender.isEnabled = false            return        }        if device?.torchMode == .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        }    }

 

swift 燈光的開啟與關閉