JSON在每次请求时都抛出nil
JSON在每次请求时都抛出nil
提问于 2020-08-03 23:16:31
我第一次尝试解析JSON数据。输出结果是- Course (成功:零，时间戳:零，基础:零，日期:零，课程:零)为什么到处都是零？
我试图更改"Course“和"Currency”结构中的值，但没有成功
import UIKit
import JavaScriptCore
struct Course: Decodable {
var success: Bool?
var timestamp: Int?
var base: String?
var date: String?
var rates: Currency?
}
struct Currency: Decodable {
var USD: Float
var AUD: Double
var CAD: Double
var PLN: Double
var MXN: Double
}
class JsonViewContoller: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let urlData: String = "http://data.fixer.io/api/latest?access_key=7ac2982c82da926b787fd2f089b110e5&symbols=USD,AUD,CAD,PLN,MXN&format=1"
guard let url = URL(string: urlData) else { return }
URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let data = data else { return }
guard error == nil else { return }
do {
let course = try JSONDecoder().decode(Course.self, from: data)
print(Course())
} catch let error {
print(error)
}
}.resume()
}
}回答 1
Stack Overflow用户
发布于 2020-08-03 23:53:14
我已经运行了您的代码，您不需要使用两个结构来解析上面的JSON数据。您可以轻松地获取单个结构中的数据。我已经修改了你的代码如下：
import UIKit
struct Course: Codable {
let success: Bool?
let timestamp: Int?
let base, date: String?
let rates: [String: Double]?
}
class JsonViewContoller: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
courseData()
}
fileprivate func courseData(){
let urlData: String = "http://data.fixer.io/api/latest?access_key=7ac2982c82da926b787fd2f089b110e5&symbols=USD,AUD,CAD,PLN,MXN&format=1"
guard let url = URL(string: urlData) else { return }
URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let data = data else { return }
guard error == nil else { return }
do {
let course = try JSONDecoder().decode(Course.self, from: data)
print(course)
} catch let error {
print(error)
}
}.resume()
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/63232159
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