Swift - 遍历嵌套枚举的所有情况

Question

I have the following nested enumeration setup:

enum UserSettings:Equatable {
    case emailSettings(EmailSettings), notificationSettings(NotificationSettings), socialSettings(SocialSettings), gameSettings(GameSettings)

    enum EmailSettings:CaseIterable {
        case enableEmails, allowPromotionalEmails
    }

    enum NotificationSettings:CaseIterable {
        case enableAppNotifications, getNewFollowerNotifications, getTaggedInPostNotifications
    }

    enum SocialSettings:CaseIterable {
        case allowChallengeInvites, allowCrewRequests, allowLeagueInvites, allowPostTagging, allowUsersToFollow, appearOffline, crewOnlyMessaging, matchesArePublic, profileIsPublic
    }

    enum GameSettings:CaseIterable {
        case syncNewMatchesOnStartup
    }
}

I'm attempting to pass a "UserSettings" value to a cell in cellForRowAt via the following code:

let cell = settingsTableView.dequeueReusableCell(withIdentifier: "yesNoSettingsCell", for: indexPath) as! YesNoSettingsCell
let currentSetting = UserSettings.SocialSettings.allCases[indexPath.row]
cell.passedUserSetting = currentSetting
return cell

The above code produces the following error:

"Cannot assign value of type 'UserSettings.SocialSettings' to type 'UserSettings'"

Changing the code in cellForRowAt to:

let currentSetting = UserSettings.socialSettings().allCases[indexPath.row]

produces the following error:

"Missing argument for parameter #1 in call"

What am I missing? How do I enumerate through all cases of a nested enumeration?

Answer 1

The error "Cannot assign value of type 'UserSettings.SocialSettings' to type 'UserSettings'" is on cell.passedUserSetting = currentSetting . You are giving context, but passedUserSetting is a UserSettings .

But when you do:

let currentSetting = UserSettings.SocialSettings.allCases[indexPath.row]

So, it means currentSetting is a UserSettings.SocialSettings .

So you are trying to set a value of type B to expected value of type A. It won't work.

You can have with you enum a UserSettings with a UserSettings.SocialSettings :

cell.passedUserSetting = .socialSettings(currentSetting)