有人可以告诉我我在做什么错吗?我已经从这里开始研究了这里的所有问题,如何使用Swift Decodable协议解码嵌套的JSON结构?并且我发现了一个似乎正是我需要Swift 4 Codable解码json的东西。
{
"success": true,
"message": "got the locations!",
"data": {
"LocationList": [
{
"LocID": 1,
"LocName": "Downtown"
},
{
"LocID": 2,
"LocName": "Uptown"
},
{
"LocID": 3,
"LocName": "Midtown"
}
]
}
}
struct Location: Codable {
var data: [LocationList]
}
struct LocationList: Codable {
var LocID: Int!
var LocName: String!
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let url = URL(string: "/getlocationlist")
let task = URLSession.shared.dataTask(with: url!) { data, response, error in
guard error == nil else {
print(error!)
return
}
guard let data = data else {
print("Data is empty")
return
}
do {
let locList = try JSONDecoder().decode(Location.self, from: data)
print(locList)
} catch let error {
print(error)
}
}
task.resume()
}
我得到的错误是:
typeMismatch(Swift.Array,Swift.DecodingError.Context(codingPath:[],debugDescription:“预期对Array进行解码,但找到了字典。”,underlyingError:nil))
检查JSON文本的概述结构:
{
"success": true,
"message": "got the locations!",
"data": {
...
}
}
的值"data"
是JSON对象{...}
,不是数组。以及对象的结构:
{
"LocationList": [
...
]
}
该对象只有一个条目"LocationList": [...]
,其值是一个数组[...]
。
您可能还需要一个结构:
struct Location: Codable {
var data: LocationData
}
struct LocationData: Codable {
var LocationList: [LocationItem]
}
struct LocationItem: Codable {
var LocID: Int!
var LocName: String!
}
用于检测...
var jsonText = """
{
"success": true,
"message": "got the locations!",
"data": {
"LocationList": [
{
"LocID": 1,
"LocName": "Downtown"
},
{
"LocID": 2,
"LocName": "Uptown"
},
{
"LocID": 3,
"LocName": "Midtown"
}
]
}
}
"""
let data = jsonText.data(using: .utf8)!
do {
let locList = try JSONDecoder().decode(Location.self, from: data)
print(locList)
} catch let error {
print(error)
}
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