用Alamofire问题解析JSON

Question

在编程方面，我是新手，我试图在Alamofire和SwiftyJSON的帮助下解析一个JSON，如果JSON文件很简单，我就没有问题，工作也很好，但是当我有类似于字典的->字典-> ->数组->字典时，问题就开始了，所以我有以下代码：

func performCYesterdayWeatherFetch(forSelectedCity: String)
{
    let properString = forSelectedCity.addingPercentEncoding(withAllowedCharacters:NSCharacterSet.urlQueryAllowed)
    Alamofire.request("http://api.apixu.com/v1/history.json?key=MY_KEY&q=\(properString!)&dt=2016-10-20").responseJSON { (response) -> Void in
        guard response.result.isSuccess else
        {
            print("Error while fetching remote rooms: \(response.result.error)")
            return
        }

        guard let json = response.result.value as? JSON,
        let forecastJson = json["forecast"].dictionary else
        {
            print("YESTERDAY PROBLEM")
            return
        }
        for item in (forecastJson["forecastday"]?.arrayValue)!
        {
          let day = item["day"].dictionaryObject
           guard let yesterdayTempCels = day?["avgtemp_c"] as! Double?,
            let yesterdayTempFahr = day?["avgtemp_f"] as! Double? else
          {
            return

          }

MY_KEY -真的是我的钥匙，问题不在于我没有输入这个键。

它总是进入其他地方：

guard let json = response.result.value as? JSON,
        let forecastJson = json["forecast"].dictionary else
        {
            print("YESTERDAY PROBLEM")
            return
        }

它们的结果JSON看起来是这样的:我需要瘦的是avgtemp_c和avgtemp_f

​

​

我做错了什么？

Answer 1

这里有一个解决方案，您甚至不需要SwiftyJSON来获取这些值。

let properString = forSelectedCity.addingPercentEncoding(withAllowedCharacters:NSCharacterSet.urlQueryAllowed)
Alamofire.request("http://api.apixu.com/v1/history.json?key=MY_KEY&q=\(properString!)&dt=2016-10-20").responseJSON { (response) -> Void
    guard let json = response.result.value as? [String: Any],
        let forecastDictionary = json["forecast"] as? [String: Any],
        let forecastDayArray = forecastDictionary["forecastday"] as? [[String: Any]] else {
            print("YESTERDAY PROBLEM")
            return
    }

    for item in forecastDayArray {
        guard let day = item["day"] as? [String: Any],
            let yesterdayTempCels = day["avgtemp_c"] as? Double,
            let yesterdayTempFahr = day["avgtemp_f"] as? Double else {
                return
        }

        // Here you should have the values that you need
    }
}