我正在尝试使用以下方法解析 JSON,但 XCode 在我声明 "data" 时给了我一个错误。
我是新来的,我不明白什么是错的。请帮我。
import UIKit
struct Contacts: Decodable {
let id: Int
let name: String
let email: String
}
class ViewController: UIViewController {
override func viewDidLoad()
{
super.viewDidLoad()
let urlString = "https://api.androidhive.info/contacts/"
guard let url = URL(string: urlString) else {return}
URLSession.shared.dataTask(with: url) { (data, response, error) in
}
guard let data = data else {return}
//let datastring = String(data: data, encoding: .utf8)
do
{
let contact = try JSONDecoder().decode([Contacts].self, from: data)
print(contact.name)
} catch let jsonErr {
print("Error deserializing json:", jsonErr)
}
}
}
三大问题。
contacts
数组的字典。id
是String
,不是Int
。String
偶数"12"
且"false"
struct Root : Decodable {
let contacts : [Contact]
}
struct Contact : Decodable { // It's recommended to name this kind of struct in singular form
let id, name, email: String
}
...
override func viewDidLoad()
{
super.viewDidLoad()
let urlString = "https://api.androidhive.info/contacts/"
guard let url = URL(string: urlString) else {return}
URLSession.shared.dataTask(with: url) { (data, response, error) in
if let error = error { print(error); return }
do {
let result = try JSONDecoder().decode(Root.self, from: data!)
let contacts = result.contacts
for contact in contacts {
print(contact.name)
}
} catch {
print("Error deserializing json:", error)
}
}.resume()
}
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