ios - 初始化对象的多种方法？

Question

我有一个将 init 与 JSON 结合使用的模型，因此我可以直接从 API 响应创建对象。

但是在这种情况下，我想初始化模型并手动输入其属性，因此它不会是 JSON。

我怎样才能有另一个初始化方法，让我不使用标准的 JSON 方法，而是手动输入我的参数？

模型看起来像这样......

class Conversation: NSObject {

    var id: String
    var index: String
    var image: String
    var firstname: String
    var lastname: String
    var withuserid: String
    var badgeCount: String

    init?(_ json: JSON) {
        guard let id = json["id"].string,
            let index = json["index"].string,
            let image = json["image"].string,
            let firstname = json["firstname"].string,
            let lastname = json["lastname"].string,
            let withuserid = json["withuserid"].string,
            let badgeCount = json["badgeCount"].string

            else { return nil }

        self.id = id
        self.index = index
        self.image = image
        self.firstname = firstname
        self.lastname = lastname
        self.withuserid = withuserid
        self.badgeCount = badgeCount
    }
}

Answer 1

只需添加另一个 init，因为您可以为一个 struct 和 class 添加多个，然后调用所需的:

class Conversation: NSObject {
    var id: String
    var index: String
    var image: String
    var firstname: String
    var lastname: String
    var withuserid: String
    var badgeCount: String

    init?(_ json: JSON) {
        guard let id = json["id"].string,
            let index = json["index"].string,
            let image = json["image"].string,
            let firstname = json["firstname"].string,
            let lastname = json["lastname"].string,
            let withuserid = json["withuserid"].string,
            let badgeCount = json["badgeCount"].string

            else { return nil }

        self.id = id
        self.index = index
        self.image = image
        self.firstname = firstname
        self.lastname = lastname
        self.withuserid = withuserid
        self.badgeCount = badgeCount
    }

    init(id: String, index: String, image: String, firstName: String, lastName: String, withUserId: String, badgeCount: String) {
        self.id = id
        self.index = index
        self.image = image
        self.firstName = firstName
        self.lastName = lastName
        self.withUserId = withUserId
        self.badgeCount = badgeCount
    }
}