swift - 尝试调用 convenience init, Swift 时调用中的额外参数

Question

我有简单的类(class):

class WmAttendee{

    var mEmail:String!
    var mName:String!
    var mType:Int!
    var mStatus:String = "0"
    var mRelationShip:String!

    init( email:String, name:String, type:Int) {
        self.mEmail = email
        self.mName = name
        self.mType = type
    }

     convenience init( email:String,  name:String,  type:Int,  status:String, relationShip:String) {
        self.init(email: email, name: name, type: type)
        self.mStatus = status
        self.mRelationShip = relationShip
    }
}

当我尝试使用 5 个参数测试第二个构造函数时，我得到:Extra argument 'status' in call

var att1 = WmAttendee(email: "myMail", name: "SomeName", type: 1); // OK

var att2 = WmAttendee(email: "mail2", name: "name2", type: 3, status: "2", relationShip: 3)
 // ERROR Extra argument 'status' in call

为什么？我错过了什么吗？

谢谢，

Answer 1

基于您的方法签名:

convenience init( email:String,  name:String,  type:Int,  status:String, relationShip:String)

relationshipStatus 应该是 String 而不是 Int:

var att2 = WmAttendee(email: "mail2", name: "name2", type: 3, status: "2", relationShip: "3")

由于您没有为 relationshipStatus 传递正确的类型，编译器无法为您方便的 init 匹配方法签名，并回退到默认的 init(它能找到的最接近的匹配)这会触发 Extra argument 错误。