swift 5 : 'self' used before 'self.init' call

Question

我正在尝试使用必需的便利可失败初始化程序。这是我正在使用的代码:

public init(authState: OIDAuthState, config: [String: String], accessibility: CFString = kSecAttrAccessibleWhenUnlockedThisDeviceOnly) throws {
        self.authState = authState
        self.config = config
        self.accessibility = accessibility

        super.init()

        KeycloakAuth.configuration = config
    }

public required convenience init?(coder aDecoder: NSCoder) {
        try? self.init(authState:     aDecoder.decodeObject(forKey: "authState")     as! OIDAuthState,
                       config:        aDecoder.decodeObject(forKey: "config")        as! [String: String],
                       accessibility: aDecoder.decodeObject(forKey: "accessibility") as! CFString)
    }

我收到错误 'self' used before 'self.init' call在 public required... 上行，并且在 try? self.init(... 上再次出现相同的错误行。

我查看了 Stack Overflow 上的其他一些相关问题。即这些:

1. iOS Swift convenience initializer self used before self.init called
2. 'self' used before self.init call error while using NSCoding on a custom class

所以我相应地安排了我的 convenience init 以尝试在出现任何问题时返回 nil:

public required convenience init?(coder aDecoder: NSCoder) {
        guard
            let authState     = aDecoder.decodeObject(forKey: "authState")     as? OIDAuthState,
            let config        = aDecoder.decodeObject(forKey: "config")        as? [String: String]
        else {
            print("KeycloakTokenManager: There was an error intializing authState or config")
            return nil
        }

        let accessibility = aDecoder.decodeObject(forKey: "accessibility") as! CFString

        try? self.init(authState: authState, config: config, accessibility: accessibility)
    }

但我在同一代码(初始化程序，并调用 self.init )上遇到了相同的错误。有趣的是，我的项目在 Swift 4 上构建良好，但我没有听说这是 Swift 5 的错误。我怎样才能摆脱这个错误？

Answer 1

一个解决方案是不调用指定的初始化器

public required init?(coder aDecoder: NSCoder) {
    guard
        let authState     = aDecoder.decodeObject(forKey: "authState")     as? OIDAuthState,
        let config        = aDecoder.decodeObject(forKey: "config")        as? [String: String]
    else {
        print("KeycloakTokenManager: There was an error intializing authState or config")
        return nil
    }

    self.authState = authState
    self.config = config 
    self.accessibility =  aDecoder.decodeObject(forKey: "accessibility") as! CFString

    super.init()

    KeycloakAuth.configuration = config
}