Fetch Boolean values from core data

In my swift code below the goal is to fetch a series of Boolean values. It should fetch multiple values. Something along the lines of false, false, true etc. Right now I am having issues in my base class on if let imageData = info[imageNo].bool causing a runtime error stating .bool is not a optional value. In my core data database the entity is called OnOff and the attribute is bool which a Boolean value. How can I fix my code to fetch the boolean values?

Base Class

class ViewController: UIViewController {
func getBool(imageNo:Int) {
   // first check the array bounds
   let info = helpBool.shareInstance.fetchBool()
    print("image count is", info.count)
   if info.count > imageNo {
       // check if the data is available
       if let imageData = info[imageNo].bool
       } else {
           // no data
           print("data is empty Textss")
   } else {
       // image number is greater than array bounds
       print("you are asking out of bounds")

Helper Class

class helpBool: UIViewController{

static let shareInstance = helpBool()
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

func fetchBool() -> [OnOff] {
    var fetchingImage = [OnOff]()
    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "OnOff")
    do {
        fetchingImage = try context.fetch(fetchRequest) as! [OnOff]
    } catch {
        print("Error while fetching the image")
    return fetchingImage

Could you define OnOff?

If OnOff.bool is just a regular Bool, then there’s no need to conditionally assign the value:

if let imageData = info[imageNo].bool