Arrays 在Swift 4.2中解析JSON数据时出现类型不匹配错误
类型不匹配错误-应解码数组,但找到字典。 我正在使用代码中嵌入的本地json文件。Json文件包含有关包的信息。我需要选择值并将它们相应地显示到tableview控制器中。请确定我在可编码模型或代码中做错了什么。JSON解析未正确处理 文件格式:Arrays 在Swift 4.2中解析JSON数据时出现类型不匹配错误,arrays,json,swift,Arrays,Json,Swift,类型不匹配错误-应解码数组,但找到字典。 我正在使用代码中嵌入的本地json文件。Json文件包含有关包的信息。我需要选择值并将它们相应地显示到tableview控制器中。请确定我在可编码模型或代码中做错了什么。JSON解析未正确处理 文件格式: { "packages": [ { "name": "Platinum Maksi 6 GB", "desc": "Zengin içerikli Platinum Maksi Paketi ile Turkcell
{
"packages": [
{
"name": "Platinum Maksi 6 GB",
"desc": "Zengin içerikli Platinum Maksi Paketi ile Turkcell Uygulamalarının keyfini sürün!",
"subscriptionType": "monthly",
"didUseBefore": true,
"benefits": [
"TV+",
"Fizy",
"BiP",
"lifebox",
"Platinum",
"Dergilik"
],
"price": 109.90,
"tariff": {
"data": "6144",
"talk": "2000",
"sms": "100"
},
"availableUntil": "1558131150"
}
]
}
型号:
基本模型
struct Base : Codable {
let packages : [Package]?
enum CodingKeys: String, CodingKey {
case packages = "packages"
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
packages = try values.decodeIfPresent([Package].self, forKey: .packages)
}
2) 包装型号:
struct Package : Codable {
let availableUntil : String?
let benefits : String?
let desc : String?
let didUseBefore : Bool?
let name : String?
let price : Int?
let subscriptionType : String?
let tariff : Tariff?
enum CodingKeys: String, CodingKey {
case availableUntil = "availableUntil"
case benefits = "benefits"
case desc = "desc"
case didUseBefore = "didUseBefore"
case name = "name"
case price = "price"
case subscriptionType = "subscriptionType"
case tariff = "tariff"
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
availableUntil = try values.decodeIfPresent(String.self, forKey: .availableUntil)
benefits = try values.decodeIfPresent(String.self, forKey: .benefits)
desc = try values.decodeIfPresent(String.self, forKey: .desc)
didUseBefore = try values.decodeIfPresent(Bool.self, forKey: .didUseBefore)
name = try values.decodeIfPresent(String.self, forKey: .name)
price = try values.decodeIfPresent(Int.self, forKey: .price)
subscriptionType = try values.decodeIfPresent(String.self, forKey: .subscriptionType)
tariff = try Tariff(from: decoder)
}
}
电价模式:
struct Tariff : Codable {
let data : String?
let sms : String?
let talk : String?
enum CodingKeys: String, CodingKey {
case data = "data"
case sms = "sms"
case talk = "talk"
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
data = try values.decodeIfPresent(String.self, forKey: .data)
sms = try values.decodeIfPresent(String.self, forKey: .sms)
talk = try values.decodeIfPresent(String.self, forKey: .talk)
}
}
我的代码:
var pack = [Package]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let url = Bundle.main.url(forResource: "packageList", withExtension: "json")!
do {
let data = try Data(contentsOf: url)
pack = try JSONDecoder().decode([Package].self, from: data)
print(pack)
} catch {
print(error)
}
您正在解码错误的对象。您必须始终解码JSON的根对象,即
Base
使用base.packages
let base = try JSONDecoder().decode(Base.self, from: data)
pack = base.packages
现在,您将得到另外两个类型不匹配错误,将福利的类型更改为[String]
,将价格更改为双重
您可以显著减少结构:删除所有编码键
和所有初始值设定项,并将所有结构成员声明为非可选(删除问号)
编辑:
解码可用,直到作为日期
声明为日期
let availableUntil: Date
并添加自定义日期解码策略,因为值是字符串(如果值为Int
,则更容易)
谢谢你,还有什么可以让我们用的?直到:我想把它定为一个日期。它的值是availableUtil:“1558131150”
非常感谢我真的很感激:)如果可能的话,还有一件事我正在创建JSON文件数据的表节“subscriptionType”:“monthly”
。值是每月、每年和每周。我的代码:枚举表节:Int{case subscriptionType=0,yearly,monthly,weekly,total}var data=[TableSection:[[String:String]]]()func sortData(){data[.yearly]=packag.filter({$0.subscriptionType==“yearly”})data[.weekly]=packag.filter({$0.subscriptionType==“weekly”}
给出错误-无法将“[Package]”类型的值分配给“[[String:String]]”类型?请提出新问题(如果有帮助,请接受此问题)。
let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .custom{ decoder -> Date in
let container = try decoder.singleValueContainer()
let dateStr = try container.decode(String.self)
guard let interval = TimeInterval(dateStr) else { throw DecodingError.dataCorruptedError(in: container, debugDescription: "Date string cannot be converted to TimeInterval") }
return Date(timeIntervalSince1970: interval)
}
let data = try Data(contentsOf: url)
let base = try decoder.decode(Base.self, from: data)
pack = base.packages