Google API的可解码结构

Question

我试图解码来自Google API服务器的数据，但它们总是会出现类似的错误

typeMismatch(Swift.Array，Swift.DecodingError.Context(codingPath:[CodingKeys(字符串值："rows"，intValue:nil(，_JSONKey(字符串值"索引0"，intValue:0(，CodingKeys(字符串值："elements"，intValue：nil(，_JSONKey(字符串值："索引0"，int值：0(，CodingKeys(字符串值："distance"，intValue:nil(]，debugDescription："应解码数组，但找到了字典。"，underlyingError:nil((

我没有任何实现的变体

{
"destination_addresses": [
"Абая-Саина, просп. Абая, Алматы, Казахстан"
],
"origin_addresses": [
"г. Алматы, ул. Джандосова, 6, уг. ул. Манаса, Алматы, Казахстан"
],
"rows": [
{
"elements": [
{
"distance": {
"text": "7,2 км",
"value": 7241
},
"duration": {
"text": "16 мин.",
"value": 980
},
"status": "OK"
}
]
}
],
"status": "OK"
}

这是我的关键结构

struct Distance:Codable {
var destination_addresses  : [String]?
var origin_addresses : [String]?
var rows : [row]?
var status : String?
enum CodingKeys:String,CodingKey{
case destination_addresses = "destination_addresses"
case origin_addresses = "origin_addresses"
case rows = "rows"
case status = "status"
}
}
struct row:Codable {
var elements : [elements]?
enum CodingKeys:String,CodingKey {
case elements = "elements"
}
}
struct elements:Codable {
var distance : [distance]?
var duration : [duration]?
var status : String?
enum CodingKeys:String,CodingKey {
case distance = "distance"
case duration = "duration"
case status = "status"
}
}
struct distance:Codable {
var text : String?
var value : Int?
enum CodingKeys:String,CodingKey {
case text = "text"
case value = "value"
}
}
struct duration:Codable {
var text : String?
var value : Int?
enum CodingKeys:String,CodingKey {
case text = "text"
case value = "value"
}
}

我的解码

let root = try decoder.decode(Distance.self, from: data)

Answer 1

您可以尝试

struct Root: Codable {
let destinationAddresses, originAddresses: [String]
let rows: [Row]
let status: String
enum CodingKeys: String, CodingKey {
case destinationAddresses = "destination_addresses"
case originAddresses = "origin_addresses"
case rows, status
}
}
struct Row: Codable {
let elements: [Element]
}
struct Element: Codable {
let distance, duration: Distance // your problem is here
let status: String
}
struct Distance: Codable {
let text: String
let value: Int
}

---

let root = try? decoder.decode(Root.self, from: data)

作为

var distance : [distance]?
var duration : [duration]?

字典不是数组吗

同样，不需要为相同的内容distance和duration创建2个strcut，只要1就足够了，因为关键是只更改密钥

此外，如果不更改密钥名称，就不要在结构中使用enum CodingKeys: String, CodingKey {，因为这将是无用的