枚举案例“国家”不是“RegisterViewController.options”类型的成员？ 为什么会这样？

Question

I want to change datasource array of tableview according to the button clicked. I use enumeration method to identify or mark the button I click.

But in the code it shows an error like:

Enum case 'country' is not a member of type 'RegisterViewController.options?'

I can't figure it out.

options is the enum containing 3 cases.

//enum declaration

enum options {
    case dawat
    case country
    case nationality
}

var lastSelection:options?

---

//code
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! PIckerTableViewCell

    if isSearching == true {
        signUser.tableData = signUser.filteredArray
        cell.lblTitle.text = signUser.tableData[indexPath.row]
    } else {
        switch lastSelection { 
        case options.country:
            signUser.unfilteredArray = signUser.countries
        case options.dawat:
            signUser.unfilteredArray = signUser.dawatTitles
        case options.nationality:
            signUser.unfilteredArray = signUser.nationalities
            signUser.tableData = signUser.unfilteredArray
            cell.lblTitle.text = signUser.tableData[indexPath.row]
        }
        return cell
    }
}

Answer 1

Either unwrap your optional property before using it

if let last = lastSelection {
    switch last { 
        case options.country:
            signUser.unfilteredArray = signUser.countries
        //and so on...                
    }
} else {
    //?
}

or add a default case to your enum

enum options {
    case dawat
    case country
    case nationality
    case notSet
}

var lastSelection = options.notSet

and then use it in the switch

switch lastSelection { 
    //other case...
    case options.notSet:
        //?
    }
}

Answer 2

hey check this answer:

enum  options  {
    case dawat
    case country
    case nationality
    case none

}

var lastSelection = options.none