5

我正在尝试使用所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)
    }

我在线路上得到错误'self' used before 'self.init' call，并且public required...在线路上再次出现同样的错误try? self.init(...。

我在 Stack Overflow 上查看了其他一些相关问题。即这些：

  1. 在调用 self.init 之前使用的 iOS Swift 便利初始化器 self
  2. 在自定义类上使用 NSCoding 时，在 self.init 调用错误之前使用了“self”

所以我相应地安排了我的便利初始化，如果有任何问题，我会尝试返回 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)
    }

但是我在相同的代码（初始化程序和调用self.init）上得到了相同的错误。有趣的是，我的项目在 Swift 4 上构建得很好，但我还没有听说过这是 Swift 5 的错误。我怎样才能摆脱这个错误？

4

2 回答 2

3

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
}
于 2019-04-10T15:52:28.867 回答
0

这是我刚刚发现的另一个解决方案，它也有效。因为初始化器不抛出，所以最终代码可以是这样的：

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

    super.init()

    KeycloakAuth.configuration = config
}

public required convenience init?(coder aDecoder: NSCoder) {
    self.init(authState:     aDecoder.decodeObject(forKey: "authState")     as! OIDAuthState,
              config:        aDecoder.decodeObject(forKey: "config")        as! [String: String],
              accessibility: aDecoder.decodeObject(forKey: "accessibility") as! CFString)
}
于 2019-04-12T15:26:14.577 回答