Switch Camera Front or Rear[iPhone Source]

// 버튼과 연결 시킬 메소드 

-(IBAction)CameraSwap:(id)sender

{

    // 세션이 실행되고 있어야 한다는 가정

    NSArray *Current_inputs = self._captureSession.inputs;

    for ( AVCaptureDeviceInput *old_input in Current_inputs) {

        AVCaptureDevice *device = old_input.device;

        if ([device hasMediaType:AVMediaTypeVideo]) {

            AVCaptureDevicePosition position = device.position;

            AVCaptureDevice *newCamera = nil;

            AVCaptureDeviceInput *newInput = nil;

            if (position == AVCaptureDevicePositionFront) {

                newCamera = [self cameraWithPosition:AVCaptureDevicePositionBack];

            } else {

                newCamera = [self cameraWithPosition:AVCaptureDevicePositionFront];

            }

            newInput = [AVCaptureDeviceInput deviceInputWithDevice:newCamera error:nil];

            // 설정 시작

            [self._captureSession beginConfiguration];

            [self._captureSession removeInput:old_input];

            [self._captureSession addInput:newInput];

            [self._captureSession commitConfiguration];

            break;

        }

    }

}

// 이 메소드도 헤더 파일에 등록해줘야 한다.

-(AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition)position {

    NSArray *Camera_devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];

    for (AVCaptureDevice *device in Camera_devices) {

        if (device.position == position) {

            return device;

        }

    }

    return nil;

}