我在这里经历了很多话题并尝试了不同的选择，但我似乎总是做错事.. 我设法正确获取 JSON，但我似乎无法解析我想要的部分。我在 developer.here.com 上使用反向地理编码请求
我已经尝试创建不同的结构和子结构，但似乎没有任何效果。我很感激任何帮助，因为我已经花了几个小时试图解决这个问题......
(p.s 我是 JSON 的新手) 这是字典，我一直在尝试提取地址下的标签，还有一个链接，因为我无法让它看起来不错 https://developer.here.com/api-explorer/rest/geocoder/reverse-geocode :
{
"Response": {
"MetaInfo": {
"Timestamp": "2019-04-04T17:45:06.052+0000",
"NextPageInformation": "2"
},
"View": [
{
"_type": "SearchResultsViewType",
"ViewId": 0,
"Result": [
{
"Relevance": 1,
"Distance": 13.6,
"MatchLevel": "houseNumber",
"MatchQuality": {
"Country": 1,
"State": 1,
"County": 1,
"City": 1,
"District": 1,
"Street": [
1
],
"HouseNumber": 1,
"PostalCode": 1
},
"MatchType": "pointAddress",
"Location": {
"LocationId": "NT_Opil2LPZVRLZjlWNLJQuWB_0ITN",
"LocationType": "address",
"DisplayPosition": {
"Latitude": 41.88432,
"Longitude": -87.63877
},
"NavigationPosition": [
{
"Latitude": 41.88449,
"Longitude": -87.63877
}
],
"MapView": {
"TopLeft": {
"Latitude": 41.8854442,
"Longitude": -87.64028
},
"BottomRight": {
"Latitude": 41.8831958,
"Longitude": -87.63726
}
},
"Address": {
"Label": "425 W Randolph St, Chicago, IL 60606, United States",
"Country": "USA",
"State": "IL",
"County": "Cook",
"City": "Chicago",
"District": "West Loop",
"Street": "W Randolph St",
"HouseNumber": "425",
"PostalCode": "60606",
"AdditionalData": [
{
"value": "United States",
"key": "CountryName"
},
{
"value": "Illinois",
"key": "StateName"
},
{
"value": "Cook",
"key": "CountyName"
},
{
"value": "N",
"key": "PostalCodeType"
}
]
},
"MapReference": {
"ReferenceId": "776372180",
"MapId": "NAAM191N0",
"MapVersion": "Q1/2019",
"MapReleaseDate": "2019-01-28",
"Spot": 0.52,
"SideOfStreet": "right",
"CountryId": "21000001",
"StateId": "21002247",
"CountyId": "21002623",
"CityId": "21002647",
"BuildingId": "9000000000002726912",
"AddressId": "79186508",
"RoadLinkId": "170008450"
}
}
}
]
}
]
}
}
struct Welcome: Codable {
let response: Response
enum CodingKeys: String, CodingKey {
case response = "Response"
}
}
struct Response: Codable {
let metaInfo: MetaInfo
let view: [View]
enum CodingKeys: String, CodingKey {
case metaInfo = "MetaInfo"
case view = "View"
}
}
struct MetaInfo: Codable {
let timestamp, nextPageInformation: String
enum CodingKeys: String, CodingKey {
case timestamp = "Timestamp"
case nextPageInformation = "NextPageInformation"
}
}
struct View: Codable {
let type: String
let viewID: Int
let result: [Result]
enum CodingKeys: String, CodingKey {
case type = "_type"
case viewID = "ViewId"
case result = "Result"
}
}
struct Result: Codable {
let relevance: Int
let distance: Double
let matchLevel: String
let matchQuality: MatchQuality
let matchType: String
let location: Location
enum CodingKeys: String, CodingKey {
case relevance = "Relevance"
case distance = "Distance"
case matchLevel = "MatchLevel"
case matchQuality = "MatchQuality"
case matchType = "MatchType"
case location = "Location"
}
}
struct Location: Codable {
let locationID, locationType: String
let displayPosition: DisplayPosition
let navigationPosition: [DisplayPosition]
let mapView: MapView
let address: Address
let mapReference: MapReference
enum CodingKeys: String, CodingKey {
case locationID = "LocationId"
case locationType = "LocationType"
case displayPosition = "DisplayPosition"
case navigationPosition = "NavigationPosition"
case mapView = "MapView"
case address = "Address"
case mapReference = "MapReference"
}
}
struct Address: Codable {
let label, country, state, county: String
let city, district, street, houseNumber: String
let postalCode: String
let additionalData: [AdditionalDatum]
enum CodingKeys: String, CodingKey {
case label = "Label"
case country = "Country"
case state = "State"
case county = "County"
case city = "City"
case district = "District"
case street = "Street"
case houseNumber = "HouseNumber"
case postalCode = "PostalCode"
case additionalData = "AdditionalData"
}
}
struct AdditionalDatum: Codable {
let value, key: String
}
struct DisplayPosition: Codable {
let latitude, longitude: Double
enum CodingKeys: String, CodingKey {
case latitude = "Latitude"
case longitude = "Longitude"
}
}
struct MapReference: Codable {
let referenceID, mapID, mapVersion, mapReleaseDate: String
let spot: Double
let sideOfStreet, countryID, stateID, countyID: String
let cityID, buildingID, addressID, roadLinkID: String
enum CodingKeys: String, CodingKey {
case referenceID = "ReferenceId"
case mapID = "MapId"
case mapVersion = "MapVersion"
case mapReleaseDate = "MapReleaseDate"
case spot = "Spot"
case sideOfStreet = "SideOfStreet"
case countryID = "CountryId"
case stateID = "StateId"
case countyID = "CountyId"
case cityID = "CityId"
case buildingID = "BuildingId"
case addressID = "AddressId"
case roadLinkID = "RoadLinkId"
}
}
struct MapView: Codable {
let topLeft, bottomRight: DisplayPosition
enum CodingKeys: String, CodingKey {
case topLeft = "TopLeft"
case bottomRight = "BottomRight"
}
}
struct MatchQuality: Codable {
let country, state, county, city: Int
let district: Int
let street: [Int]
let houseNumber, postalCode: Int
enum CodingKeys: String, CodingKey {
case country = "Country"
case state = "State"
case county = "County"
case city = "City"
case district = "District"
case street = "Street"
case houseNumber = "HouseNumber"
case postalCode = "PostalCode"
}
}
guard let jsonString = try JSONSerialization.jsonObject(with: data, options: []) as? [String:AnyObject] else {return}
print (jsonString)//it prints the json correctly
let address_label = try? JSONDecoder().decode(Address.self, from: data)
print(address_label) //prints out nil
// some more code here that catches errors
最佳答案
错误
keyNotFound(CodingKeys(stringValue: "Label", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: \"Label\", intValue: nil) (\"Label\").", underlyingError: nil))"
很清楚。这可能意味着
- 提到的键在 JSON 中不存在。情况并非如此，因为 key
Label确实存在。 - 你正在解码错误的结构。 情况就是这样，因为根对象是
Welcome。
您必须始终解码 JSON 的根对象，并通过访问属性获得更深的层次。使用代码完成，它会帮助你。
关于ios - 从 json 中提取问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55530247/