小编典典

Swift:不符合协议NSCoding

swift

我试图在我快速编写的类上使用NSCoding协议,但是似乎无法弄清楚为什么当我实现所需的方法时,编译器会抱怨它“不符合协议NSCoding”:

class ServerInfo: NSObject, NSCoding {

    var username = ""
    var password = ""
    var domain = ""
    var location = ""
    var serverFQDN = ""
    var serverID = ""

    override init() {

    }

    init(coder aDecoder: NSCoder!) {
        self.username = aDecoder.decodeObjectForKey("username") as NSString
        self.password = aDecoder.decodeObjectForKey("password") as NSString
        self.domain = aDecoder.decodeObjectForKey("domain") as NSString
        self.location = aDecoder.decodeObjectForKey("location") as NSString
        self.serverFQDN = aDecoder.decodeObjectForKey("serverFQDN") as NSString
        self.serverID = aDecoder.decodeObjectForKey("serverID") as NSString
    }


    func encodeWithCoder(_aCoder: NSCoder!) {
        _aCoder.encodeObject(self.username, forKey: "username")
        _aCoder.encodeObject(self.password, forKey: "password")
        _aCoder.encodeObject(self.domain, forKey: "domain")
        _aCoder.encodeObject(self.location, forKey: "location")
        _aCoder.encodeObject(self.serverFQDN, forKey: "serverFQDN")
        _aCoder.encodeObject(self.serverID, forKey: "serverID")
    }

}

这是一个错误还是我只是缺少一些东西?


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2020-07-07

共1个答案

小编典典

如您在报告导航器中详细的编译器消息中所见,您的方法未正确声明:

错误:类型“ ServerInfo”不符合协议“ NSCoding”
ServerInfo类:NSObject,NSCoding {
^
Foundation.NSCoding:2:32:注意:协议要求函数'encodeWithCoder'类型为((NSCoder)-> Void'
  @objc(encodeWithCoder :) func encodeWithCoder(aCoder:NSCoder)
                               ^
注意:候选者的类型不匹配'(NSCoder!)->()'
    func encodeWithCoder(_aCoder:NSCoder!){
         ^
Foundation.NSCoding:3:25:注意:协议要求初始化类型为'(coder:NSCoder)'的初始化程序'init(coder :)'
  @objc(initWithCoder :) init(编码器aDecoder:NSCoder)
                        ^
注意:候选人具有不匹配的类型'(coder:NSCoder!)'
    init(coder aDecoder:NSCoder!){

(在beta版本之间可能有所变化。)此外,该initWithCoder方法必须标记为required

required init(coder aDecoder: NSCoder) {   }

func encodeWithCoder(_aCoder: NSCoder) {   }

Swift 3中 ,所需的方法是

required init(coder aDecoder: NSCoder) {   }

func encode(with aCoder: NSCoder) {   }
2020-07-07