json - swift 3 中的 AlamofireObjectMapper

Question

我想第一次使用 AlamofireObjectMapper 来快速解析 json 响应。

回应是:

  "success": true,
  "terms": "https:\/\/currencylayer.com\/terms",
  "privacy": "https:\/\/currencylayer.com\/privacy",
  "timestamp": 1480007048,
  "source": "USD",
  "quotes": {
    "USDAED": 3.672598,
    "USDAFN": 66.599998,
    "USDALL": 127.999937,
    "USDAMD": 478.679993,
    "USDANG": 1.780277,
    "USDAOA": 165.072998,
    "USDARS": 15.497261,
    "USDAUD": 1.348899,
    "USDAWG": 1.79,
    "USDAZN": 1.714104,
    "USDBAM": 1.855297,
    "USDBBD": 2,
    "USDBDT": 79.179735,
    "USDBGN": 1.854199,
    "USDBHD": 0.377036,
    "USDBIF": 1668.300049,
    "USDBMD": 1,
    "USDBND": 1.429902,
    "USDBOB": 6.870014,
    "USDBRL": 3.396898,
    "USDBSD": 1,
}

我是这样映射的:

class ModelCurrency:  Mappable {

    var success   : Bool?
    var terms     : String?
    var privacy   : String?
    var timestamp : CGFloat?
    var source    : String?
    var quotes    : [Quotes]?

    init() {}

    required init?(map: Map) {

    }

    func mapping(map: Map) {

         success<-map["success"]
         terms<-map["terms"]
         privacy<-map["privacy"]
         timestamp<-map["timestamp"]
         source<-map["source"]
         quotes<-map["quotes"]

        print("It json\(terms)")
    }
}

class Quotes : Mappable {

    var name : String?
    var val : CGFloat?

    required init?(map: Map) {

    }

    func mapping(map: Map) {
        name<-map["name"]
        val<-map["val"]
    }
}

在我的 Controller 中:

 override func viewDidLoad() {
        super.viewDidLoad()

        tableView.delegate = self
        tableView.dataSource = self

        super.viewDidLoad()
        let URL = "http://www.apilayer.net/api/live?access_key=ad847a0a855c0647590df2b818923025"

 Alamofire.request(URL).responseArray(queue: "quotes") { (response: DataResponse<[Quotes]>) in
            let arrayCurency = response.result.value!


                for quotes in arrayCurency {
                    print(quotes.name!)
                    print(quotes.val!)
                }

        }

    }

它给了我错误映射和这个错误:

cannot convert value 'String' to expected argument type 'DispatchQueue?'

Answer 1

有几个问题。

您要引用DataResponse<ModelCurrency>而不是 DataResponse<[Quotes]> .

您要使用 responseObject ，不是 responseArray .

你不想使用那个 queue带有 String 的参数值(value)。 queue参数用于指定您希望完成处理程序运行的调度队列。但这不是你在这里做的，所以你应该删除它。

与 quotes 关联的值key 不是对象数组。它又是一本字典。所以你应该把它映射到字典，然后使用 map将其转换为 Quote 数组的方法对象。

所以，把所有这些放在一起:

Alamofire.request(urlString).responseObject { (response: DataResponse<ModelCurrency>) in
    ...
}

和

class ModelCurrency:  Mappable {

    var success   : Bool?
    var terms     : String?
    var privacy   : String?
    var timestamp : CGFloat?
    var source    : String?
    var quotes    : [Quote]?

    required init?(map: Map) { }

    func mapping(map: Map) {

        success    <- map["success"]
        terms      <- map["terms"]
        privacy    <- map["privacy"]
        timestamp  <- map["timestamp"]
        source     <- map["source"]

        var dictionary: [String: CGFloat]?
        dictionary <- map["quotes"]
        quotes = dictionary?.map { return Quote(name: $0.key, val: $0.value) }
    }
}

class Quote {

    var name : String?
    var val : CGFloat?

    init(name: String?, val: CGFloat?) {
        self.name = name
        self.val  = val
    }

}

(我已将 Quotes 重命名为 Quote，因为它似乎是单一货币的报价。)