iOS ) Custom Camera에서 tap to Foucs 기능 구현하기

//스크린 화면을 터치시 포커스 잡아주는 메서드
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        let touchPoint = touches.first! as UITouch
        // view1 = > 카메라 스크린 view
        let screenSize = view1.bounds.size
        let focusPoint = CGPoint(x: touchPoint.location(in: view1).y / screenSize.height, y: 1.0 - touchPoint.location(in: view1).x / screenSize.width)

        if let device = AVCaptureDevice.default(for: AVMediaType.video) {
            do {
                try device.lockForConfiguration()
                if device.isFocusPointOfInterestSupported {
                    device.focusPointOfInterest = focusPoint
                    device.focusMode = AVCaptureDevice.FocusMode.autoFocus
                }
                if device.isExposurePointOfInterestSupported {
                    device.exposurePointOfInterest = focusPoint
                    device.exposureMode = AVCaptureDevice.ExposureMode.autoExpose
                }
                device.unlockForConfiguration()

            } catch {
                // Handle errors here
            }
        }
    }