Method to request an AVCaptureDevice with a certain position. Method will fallback to the default AVCaptureDevice.

device_position.m

- (AVCaptureDevice *) getCaptureDeviceWithPosition:(AVCaptureDevicePosition)position
{
    AVCaptureDevice *device;

    // loop through all capture devices with video mediatype
    for (AVCaptureDevice *d in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]) {
        check if the devices position is the desired one
        if ([d position] == position) {
            device = d;
        }
    }

    // if we didnt get the desired device at position, lets go back to the default one
    if (!device) {
        device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    }

    return device;
}

// USAGE:

// get the front facing camera:
AVCaptureDevice *device = [self getCaptureDeviceWithPosition:AVCaptureDevicePositionFront];

// get the back facing camera:
AVCaptureDevice *device = [self getCaptureDeviceWithPosition:AVCaptureDevicePositionBack];