快速从模态表视图返回值到主表视图（IOS）

Question

I have a main viewController with a tableview. When a button is pressed on a cell, a modal will appear and allow user to select multiple selection. So I presented a modal controller which is again a tableViewController which on dismiss will give a string value. But once modalView is dismissed and returns to my main tableView, tableView.reload() shows Nil while unwrapping an optional value.

Code :

// In modalTableViewController
//Protocol
protocol modalViewControllerDelegate {
func sendText( text: String)
}

//after all cell operations Done Button Action
@IBAction func doneBtnPressed(_ sender: Any) {

    mystr = selectedValues.joined(separator: ",")
    if(mystr != "")
    {
        let vc = viewController()
        delegate?.sendText(text: self.mystr)
    }
    self.dismiss(animated: true, completion: nil)
}
//In viewController
class ViewController : UIViewController,modalViewControllerDelegate{
 func sendText(text: String) {
    saveFormValue(mystr: text)
}
// .....
//SaveFunction
func saveFormValue(mystr:String){
self.tableView.reloadData() //HERE IAM GETTING ERROR (FOUND NIL)
//save operations goes here

}


.....
///
//Checking Cell type and calling function
if (cell.type == .multiSelect) {
    showCheckBox(data: ["One","Two","Three"])       
}
// Modal view function
func showCheckBox(data:[String])
{
    print("ShowCheckBox")
    checkBoxData = data //Assigning to a globalVariable
    self.performSegue(withIdentifier: "multiselectSegue", sender: self)
}

Answer 1

Are you allocating the mainVC as the modal's delegate? I believe that is the step you are missing (based on the code posted)

If you are, you might want to add breakpoints and check that the sendText and saveFormValue methods are actually getting called.