swift - 如何在 swift 3 中使用 Alamofire->4.0 映射对象

Question

我是 swift 编程语言的新手，我必须在 Swift 3 中使用 Alamofire 4.0 映射对象并遵循相同的链接> https://github.com/tristanhimmelman/AlamofireObjectMapper

但是当我复制粘贴下面的代码时，我得到了 nil 响应，有人可以帮助我了解如何使用 GET 和 POST< 映射模型对象吗/strong> 方法？

代码:-

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let URL = "https://raw.githubusercontent.com/tristanhimmelman/AlamofireObjectMapper/2ee8f34d21e8febfdefb2b3a403f18a43818d70a/sample_keypath_json"

        Alamofire.request(URL).responseObject { (response: DataResponse<WeatherResponse>) in

            switch(response.result) {

            case .success(_):

                if response.result.value != nil{

                    let weatherResponse = response.result.value

                    print("response is========>\(weatherResponse?.location))")

                    if let threecatForday = weatherResponse?.threeDayForecast{

                        for forCast in threecatForday{
                            print("Day is======>\(forCast.day)")
                            print("Tempurature======>\(forCast.temperature)")
                        }
                    }

                }
                break

            case .failure(_):
                print(response.result.error!)
                break
            }
        }
    }
}

WetherResponse:-

import UIKit
import ObjectMapper

class WeatherResponse: Mappable {

    var location: String?
    var threeDayForecast: [Forecast]?

    required init?(map: Map){

    }

    func mapping(map: Map) {
        location <- map["location"]
        threeDayForecast <- map["three_day_forecast"]
    }
}

预测:-

import UIKit
import ObjectMapper

class Forecast: Mappable {

    var day: String?
    var temperature: Int?
    var conditions: String?

    required init?(map: Map) {

    }

    func mapping(map: Map) {
        day <- map["day"]
        temperature <- map["temperature"]
        conditions <- map["conditions"]
    }
}

Answer 1

您的WeatherResponse 模型缺少data 节点

使用这个模型

class WeatherResponse: Mappable {

    var data: WeatherResponseData?

    required init?(map: Map){ }

    func mapping(map: Map) {
        data <- map["data"] // data
    }
}


class WeatherResponseData: Mappable {

    var location: String?
    var threeDayForecast: [Forecast]?

    required init?(map: Map){

    }

    func mapping(map: Map) {
        location <- map["location"]
        threeDayForecast <- map["three_day_forecast"]
    }
}


class Forecast: Mappable {

    var day: String?
    var temperature: Int?
    var conditions: String?

    required init?(map: Map) {

    }

    func mapping(map: Map) {
        day <- map["day"]
        temperature <- map["temperature"]
        conditions <- map["conditions"]
    }
}

然后打印结果

print("response is========>\(weatherResponse?.data?.location))")