Swift 领域导入 Json 数组数据

Swift Realm import Json Array Data

我需要从 Json 数组文件将初始数据安装到我的 Swift 领域。

json 数据位于名为 "FundData.json" 的文件中。

我想我在读取 Json 数据时遇到问题,因为它在一个数组中。

进行数据库初始设置的最佳方法是什么?我通常使用 SwiftyJSON。我不是 Json 或 Realm 那种人。

这是简化的领域Class:

import Foundation
import RealmSwift

class Fund: Object  {

    @objc dynamic var symbol:String = ""
    @objc dynamic var name:String = ""
    @objc dynamic var type:String = ""
    @objc dynamic var primary:Bool = false

}

这里是一些 Json 数据:

[
{
    "symbol": "VTSMX",
    "name": "Vanguard Total Stock Market Index Fund",
    "type": "stock",
    "primary": "true"
},
{
    "symbol": "VFIAX",
    "name": "Vanguard 500 Index Fund",
    "type": "stock",
    "primary": "false"
},
{
    "symbol": "VSMAX",
    "name": "Vanguard Small-Cap Index Fund",
    "type": "stock",
    "primary": "false"
},
{
    "symbol": "VWIGX",
    "name": "Vanguard International Growth Fund Investor Shares",
    "type": "stock",
    "primary": "false"
}
]

我能够使用带字符串的 Realm 示例。我不知何故需要从 json 文件中获取数据。

let data = "{\"symbol\": \"VTSMX\",\"name\": \"Vanguard Total Stock Market Index Fund\",\"type\": \"stock\",\"default\": \"1\" }".data(using: .utf8)!


try! realm.write {
let json = try! JSONSerialization.jsonObject(with: data, options: [])
        realm.create(Fund.self, value: json, update: .modified)
    }

谢谢。

将您的解析行更改为

let array = try JSONSerialization.jsonObject(with: data, options: []) as? [[String: Any]]

array 变量将包含一个包含您的数据的字典数组。所以你需要遍历数组来创建你的 Fund 对象

do {
    if let array = try JSONSerialization.jsonObject(with: data, options: []) as? [[String: Any]] {
        print(array)
    }
} catch {
    print(error)
}

将打印

[["name": "Vanguard Total Stock Market Index Fund", "primary": "true", "type": "stock", "symbol": "VTSMX"], ["symbol": "VFIAX", "name": "Vanguard 500 Index Fund", "type": "stock", "primary": "false"], ["type": "stock", "primary": "false", "symbol": "VSMAX", "name": "Vanguard Small-Cap Index Fund"], ["primary": "false", "symbol": "VWIGX", "name": "Vanguard International Growth Fund Investor Shares", "type": "stock"]]

您也可以考虑让您的 Fund class 实施 Codable,但我不确定这里是否值得。