-1 
struct Jresponse: Decodable{
            //var results: [Any]
            var resolution: Int?
            var elevation:  Int?
            var location: Int?
            var lat: Int?
            var lng: Int?
        }
        guard let url = URL(string: "https://maps.googleapis.com/maps/api/elevation/json?&locations=\(finalStringConvertedCoordinates)&key=\(apiKey)") else {
                    print("Error: cannot create URL")
                    return
                }
                // Create the url request
                var request = URLRequest(url: url)
                request.httpMethod = "GET"
                URLSession.shared.dataTask(with: request) { data, response, error in
                    guard error == nil else {
                        print("Error: error calling GET")
                        print(error!)
                        return
                    }
                    guard let data = data else {
                        print("Error: Did not receive data")
                        return
                    }
                    guard let response = response as? HTTPURLResponse, (200 ..< 299) ~= response.statusCode else {
                        print("Error: HTTP request failed")
                        return
                    }
                    do {
                        guard let jsonObject = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
                            print("Error: Cannot convert data to JSON object")
                            return
                        }
                        guard let prettyJsonData = try? JSONSerialization.data(withJSONObject: jsonObject, options: []) else {
                            print("Error: Cannot convert JSON object to Pretty JSON data")
                            return
                        }
                        guard let prettyPrintedJson = String(data: prettyJsonData, encoding: .utf8)
                        else {
                            print("Error: Could print JSON in String")
                            return
                        }
                        //print(prettyPrintedJson)
                        jsonResponse = prettyPrintedJson
                    } catch {
                        print("Error: Trying to convert JSON data to string")
                        return
                    }
                    let decoder = JSONDecoder()
                    let jrData = jsonResponse.data(using: .utf8)
                    let jsonResponseProcessed = try! decoder.decode(Jresponse.self, from: jrData! )
                    print(jsonResponseProcessed)
                }.resume()
        
            }

上面的代码包含响应的请求和解码，我对 JSON 不熟悉，这可能很明显。

我遇到的问题是打印时返回的结果都是零。

以前我没有使用解码，而是试图将数据处理成一个数组，可以检索单个值进行比较。

数组方法会产生无法管理的数据，因为元素没有按可管理的顺序分开。

像这样[零响应][1]

包含 print("---> data: (String(data: data, encoding: .utf8))") 的输出看起来像这样。

[可以在这里看到输出][2]

---> 数据：可选（“{\n“结果”：[\n {\n“海拔”：11.59268283843994，\n“位置”：{\n“纬度”：37.78533554077148，\n“lng”：- 122.4059982299805\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 11.68190288543701,\n "位置" : {\n "lat" : 37.78538513183594,\n "lng40": \n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 11.86490249633789,\n "位置" : {\n "纬度" : 37.78548812866211,\n "lng" : -122.405914306646 n },\n "分辨率" : 0。5964969992637634\n },\n {\n "海拔" : 11.53255939483643,\n "位置" : {\n "纬度" : 37.78533554077148,\n "lng" : -122.4061584472656\n },\n "分辨率" :37564\n999260 \n },\n {\n "海拔" : 11.46291351318359,\n "位置" : {\n "纬度" : 37.78533554077148,\n "lng" : -122.4063262939453\n },\n "分辨率" : 0.596\9699263763 n },\n {\n "海拔" : 11.69645023345947,\n "位置" : {\n "纬度" : 37.78558731079102,\n "lng" : -122.4059143066406\n },\n "分辨率" : 0.596496992637634\n },\n {\n "海拔" : 11.79109859466553,\n "位置" : {\n "纬度" : 37.78569030761719,\n "lng" : -122.4059143066406\n },\n "分辨率" : 0.59649699\n2637634\n}, n {\n "海拔" : 11.35733222961426,\n "位置" : {\n "纬度" : 37.78533554077148,\n "lng" : -122.4064865112305\n },\n "分辨率" : 0.5964969992637634\n }, {\n“海拔”：11.57364559173584，\n“位置”：{\n“纬度”：37.78533554077148，\n“lng”：-122.4066467285156\n}，\n“分辨率”：0.5964969992637634\n}，\n \n "海拔”：11.7429027557373，\n“位置”：{\n“纬度”：37.78578948974609，\n“lng”：-122.4059143066406\n}，\n“分辨率”：0.5964969992637634\n}，\n {\n“海拔" : 12.02133083343506,\n "位置" : {\n "纬度" : 37.78589248657227,\n "lng" : -122.4059143066406\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔: 11.66207313537598,\n "位置" : {\n "lat" : 37.78533554077148,\n "lng" : -122.4068145751953\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" 11.85497093200684,\n "位置" : {\n "纬度" : 37.78536987304688,\n "lng" : -122.4069137573242\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.220\11947631836, n "位置" : {\n "纬度" : 37.78599548339844,\n "lng" : -122.4059143066406\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.59670543670654,\n "位置" : {\n "纬度" : 37.78609466552734,\n "lng" : -122.4059143066406\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.19275951385498,\n地点” ：{\n "纬度" : 37.78546905517578,\n "lng" : -122.4069137573242\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.13292598724365,\n "位置" \n "纬度" : 37.78557205200195,\n "lng" : -122.4069137573242\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.9876384735\n "位置" : { n "纬度" : 37.78619766235352,\n "lng" : -122.4059143066406\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 13.3654317855835,\n "位置" : {\n “纬度”：37。78629684448242,\n "lng" : -122.4059143066406\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.14237785339355,\n "位置" : {7565"lat.048828828 ,\n "lng" : -122.4069137573242\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.26948738098145,\n "位置" : {\n "lat" : 37.785774230957 \n "lng" : -122.4069137573242\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 13.74397277832031,\n "位置" : {\n "lat" : 37.78\33499145508, n"lng" : -122.4060211181641\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 14.1032075881958,\n "位置" : {\n "lat" : 37.78633499145508,\n" " : -122.4061889648438\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.31325626373291,\n "位置" : {\n "lat" : 37.7858772277832,\n "lng" : -122.4069137573242\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.36202812194824,\n "位置" : {\n "lat" : 37.78598022460938,\n "lng" -122。4069137573242\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 14.12999248504639,\n "位置" : {\n "纬度" : 37.78633499145508,\n "lng" : -128.94634 \n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 14.4321174621582,\n "位置" : {\n "纬度" : 37.78633499145508,\n "lng" : -122.4065093994141\n n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 12.53042221069336,\n "位置" : {\n "纬度" : 37.78607940673828,\n "lng" : -122.4069137573242\n },\n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 13.14097881317139,\n "位置" : {\n "纬度" : 37.78618240356445,\n "lng" : -122.40691\7573242\n }, n "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 14.39413261413574,\n "位置" : {\n "纬度" : 37.78633499145508,\n "lng" : -122.4066696166992\n }, "分辨率" : 0.5964969992637634\n },\n {\n "海拔" : 14.40865802764893,\n "位置" : {\n "纬度" : 37.78633499145508,\n "lng" : -122.4068374633789\n },\n分辨率”：0。5964969992637634\n },\n {\n "海拔" : 13.98401737213135,\n "位置" : {\n "纬度" : 37.78628158569336,\n "lng" : -122.4069137573242\n }644\n "分辨率" 99926:3 \n }\n ],\n "status" : "OK"\n}\n") Jresponse（分辨率：无，海拔：无，位置：无，纬度：无，lng：无）[1]：纬度：无，液化天然气：无）[1]：纬度：无，液化天然气：无）[1]：https://i.stack.imgur.com/uaRZZ.png [2]：https ://i.stack.imgur.com/MWJZX.png

4

2 回答 2

1

正如@Joakim Danielson 所建议的那样，您应该将代码修改为

 let jsonResponseProcessed = try! decoder.decode(Jresponse.self, from: data )

根据谷歌文档，在：https ://developers.google.com/maps/documentation/elevation/start

你应该使用这个数据结构：编辑

struct Jresponse: Codable {
    let results: [Result]
    let status: String?
}

struct Result: Codable {
    let elevation: Double
    let location: Location
    let resolution: Double?
}

struct Location: Codable {
    let lat, lng: Double
}
于 2021-08-19T11:32:48.720 回答
1

解码失败

您无法获取任何数据的最可能原因是您的数据模型（此处定义为 struct Jresponse）不适合后端发回的实际 JSON 格式。

我已经快速检查了 google map api doc 的海拔，看起来你应该在顶层收到一个带有 ElevationResult 数组的 json 对象。然后每个结果将包含分辨率、高度和位置。

请参考https://developers.google.com/maps/documentation/elevation/overview#ElevationResult

正确的数据模型


struct ElevationResponse: Decodable {
    let results: [ElevationResult]
}

struct ElevationResult: Decodable {
     let elevation: Double
     let location: LatLngLiteral
     let resolution: Double?
}

struct LatLngLiteral: Decodable {
     let lat: Double
     let lng: Double
}

更改解码模型

let jsonResponseProcessed = try! decoder.decode(ElevationResponse.self, from: data)

附注

  1. 解码数据的方式可以现代化和清洁
  2. 注意不要使用 force unwrap 和 force try
  3. 发布您的问题时，请注意代码缩进，首先在 Xcode 中选择您的代码并执行 actrl + i以提高其可读性。然后才将其复制到您的 Stackoverflow 问题中。
于 2021-08-19T11:36:41.830 回答