Swift - 遍歷嵌套枚舉的所有情況

Question

我有以下嵌套枚舉設置：

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
    }
}

我正在嘗試通過以下代碼將“UserSettings”值傳遞給cellForRowAt中的單元格：

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

上面的代碼產生以下錯誤：

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

將cellForRowAt中的代碼更改為：

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

產生以下錯誤：

"Missing argument for parameter #1 in call"

我錯過了什么？ 如何枚舉嵌套枚舉的所有情況？

Answer 1

錯誤"Cannot assign value of type 'UserSettings.SocialSettings' to type 'UserSettings'"在cell.passedUserSetting = currentSetting上。 您正在提供上下文，但passedUserSetting是一個UserSettings 。

但是當你這樣做時：

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

所以，這意味着currentSetting是一個UserSettings.SocialSettings 。

因此，您嘗試將 B 類型的值設置為 A 類型的預期值。它不起作用。

您可以使用UserSettings.SocialSettings UserSettings

cell.passedUserSetting = .socialSettings(currentSetting)