ios - 在 Swift 中使用 Google Places API 从 JSON 数据创建对象

Question

所以我正在创建一个应用程序，它使用 Google Places API 来收集餐馆列表。使用 API 为我提供了一个 JSON 文件，其中包含每个位置的详细信息，如纬度、经度、评级、价格水平、openNow、照片等。下面是用于从我给定的参数收集所述 JSON 的代码:

func performGoogleSearch(radius: Double, type: String, price: Int ) {

    let location = locationManager.location?.coordinate

    let url: URL = URL(string: "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=\(location?.latitude ?? 0),\(location?.longitude ?? 0)&radius=\(radius * 1609.34)&type=restaurant&maxprice=\(price)&key=AIzaSyBF0uwjr6BZc-Y-0kPsMBq2zNkl5EArioQ")!

    let task = URLSession.shared.dataTask(with: url) {(data, response, error) in
        print(NSString(data: data!, encoding: String.Encoding.utf8.rawValue))
    }

    task.resume()
}

返回的数据是一个像下面这样的 JSON:

{
"html_attributions" : [],
"results" : [
  {
     "geometry" : {
        "location" : {
           "lat" : 37.7867167,
           "lng" : -122.4111737
        },
        "viewport" : {
           "northeast" : {
              "lat" : 37.7881962302915,
              "lng" : -122.4098846697085
           },
           "southwest" : {
              "lat" : 37.7854982697085,
              "lng" : -122.4125826302915
           }
        }
     },
     "icon" : "https://maps.gstatic.com/mapfiles/place_api/icons/lodging-71.png",
     "id" : "3344890deedcb97b1c2d64814f92a02510ba39c8",
     "name" : "Clift San Francisco",
     "opening_hours" : {
        "open_now" : false,
        "weekday_text" : []
     },
     "photos" : [
        {
           "height" : 900,
           "html_attributions" : [
              "\u003ca href=\"https://maps.google.com/maps/contrib/114937580614387417622/photos\"\u003eClift San Francisco\u003c/a\u003e"
           ],
           "photo_reference" : "CmRaAAAAwpWxfFJMJnK8G-LWJehCyUH5PFtepMF26XkZnXDRDo0wJMe-dAXLZ0zXGDmoEMi9n8YF5rYhgnr-EoDZFUawtiITYYocTJDAAjo1hw0sos4wVpfnx186o6pPgQWEv1f0EhDrydRti0bHEkhY4FNANV_KGhRmH8m7e6mO1sR2FlFxFuo5oSl00g",
           "width" : 1155
        }
     ],
     "place_id" : "ChIJFUBxSY6AhYARwOaLV7TsLjw",
     "price_level" : 4,
     "rating" : 4.1,
     "reference" : "CmRRAAAAA4IUvt3mHf2_QejiFA1acdgH2pg5h1_6GYDuVt-bzSwHqieSXmCAye5FRGJ0EjIM03WICU82MuKOiHor65j-e8rCDNEkltQnpoUX4AbCfRdybuqIPS5FxNsV_905or7BEhDNu3bKvzktrh2USu0zSNtoGhSkqf9WV1snRVufZ11kN6YgF961YQ",
     "scope" : "GOOGLE",
     "types" : [
        "night_club",
        "bar",
        "lodging",
        "restaurant",
        "food",
        "point_of_interest",
        "establishment"
     ],
     "vicinity" : "495 Geary Street, San Francisco"
  },
  {
     "geometry" : {
        "location" : {
           "lat" : 37.78988329999999,
           "lng" : -122.4091511
        },
        "viewport" : {
           "northeast" : {
              "lat" : 37.79135163029149,
              "lng" : -122.4078268197085
           },
           "southwest" : {
              "lat" : 37.78865366970849,
              "lng" : -122.4105247802915
           }
        }
     },
     "icon" : "https://maps.gstatic.com/mapfiles/place_api/icons/lodging-71.png",
     "id" : "547ceb15210b70b8734500183410bb10c644c395",
     "name" : "Cornell Hotel De France",
     "opening_hours" : {
        "open_now" : true,
        "weekday_text" : []
     },
     "photos" : [
        {
           "height" : 315,
           "html_attributions" : [
              "\u003ca href=\"https://maps.google.com/maps/contrib/114711934191765864568/photos\"\u003eCornell Hotel De France\u003c/a\u003e"
           ],
           "photo_reference" : "CmRaAAAAJ3kTtFbeGT-8NWKbf9TPlN6gL6daO5zKq9DNZnzShZ-CcPUJnxMaVZybHZ0sGefM72WV01VcXr1AJWNKOSifZ63DIxxutKJ0ecqPUkM73LZLM-LO_eqsaWBRH8QN6PLYEhDykcPC3JAyDEDWpdiu3FP8GhRiJrTRNpnYQi1DDztzCRVKAM4N_A",
           "width" : 851
        }
     ],
     "place_id" : "ChIJs6F3JYyAhYARDiVdBrmivCs",
     "price_level" : 4,
     "rating" : 4.2,
     "reference" : "CmRRAAAAK05VMbTrE3cDxZreuM-Z0rbXcfdT4nflU0D17oCIwaF2RVbF85ch-1qKfRAGtMPxuuBvzw9sO-Y1rwRin-fEmzvgtiPsy8X_R2kfzh7rHX8iS8gJKc1QyTk2H4XU2O4hEhDMcIcjK5fWFvnGrJWxHgC6GhQAOkKXMCm7IjhOeOD__ZqzFlosmg",
     "scope" : "GOOGLE",
     "types" : [
        "clothing_store",
        "store",
        "lodging",
        "restaurant",
        "food",
        "point_of_interest",
        "establishment"
     ],
     "vicinity" : "715 Bush Street, San Francisco"
  }
],
"status" : "OK"
}

我有一个名为“Location”的对象，它希望将JSON作为参数来填充其各自的值。我想达到这样的程度，即我可以采用此 JSON 并将其转换为我的“Location”结构数组，并为 Google Places API JSON 中返回的每家餐厅填充一个“Location”。这是“位置”结构:

import Foundation

struct Location: Codable {

    var lat: Double
    var long: Double
    var icon: String?
    var id: String?
    var name: String
    var openNow: Bool?
    var photos: [String : Any]?
    var placeID: String?
    var priceLevel: Int?
    var rating: Double?
    var types: [String]?

    init?(json: [String: Any]) {
        guard let lat = json["lat"] as? Double,
            let long = json["lng"] as? Double,
            let icon = json["icon"] as? String,
            let id = json["id"] as? String,
            let name = json["name"] as? String,
            let openNow = json["open_now"] as? Bool,
            let photos = json["photos"] as? [String : Any],
            let placeID = json ["place_id"] as? String,
            let priceLevel = json["price_level"] as? Int,
            let rating = json["rating"] as? Double,
            let types = json["types"] as? [String]? else {
                return nil
        }

        self.lat = lat
        self.long = long
        self.icon = icon
        self.id = id
        self.name = name
        self.openNow = openNow
        self.photos = photos
        self.placeID = placeID
        self.priceLevel = priceLevel
        self.rating = rating
        self.types = types
    }
}

这个结构是一个开始，但显然缺乏，因为我不知道如何从 JSON 中获取数据来制作这个“位置”结构的数组。任何指导将不胜感激。

Answer 1

您可以使用 JSONDecoder

let decoder = JSONDecoder()

do {
    let locations = try decoder.decode([Location].self, from: yourJson)
    print(locations)
} catch {
    print(error.localizedDescription)
}

您还可以嵌套结构来表示您可能必须要做的数据。查看 this guide to JSON parsing 上的“更复杂的嵌套响应”