如何使用 SwiftyJSON 读取数组中的 JSON 数据？

Question

I have just been introduced to using JSON data in my iOS app. I used a service to parse JSON data from a website, and I would like to decode that data to display to my user in a UITableView . My JSON data looks as follows:

{
  "success": true,
  "outputScenario": "Default",
  "data": {
    "collection": [
      {
        "teamName": "Gulf Coast Monarchs, FL",
        "teamW": "10",
        "teamL": "0",
        "teamT": "0",
        "teamPct": "1.000",
        "teamGB": "-",
        "teamGP": "10",
        "teamRA": "10",
        "teamDivision": "10-0-0"
      },
      {
        "teamName": "Ohio Nationals, OH",
        "teamW": "9",
        "teamL": "1",
        "teamT": "0",
        "teamPct": ".900",
        "teamGB": "1.0",
        "teamGP": "10",
        "teamRA": "20",
        "teamDivision": "9-1-0"
      },      {
        "teamName": "Mount Kisco Chiefs, NY",
        "teamW": "0",
        "teamL": "8",
        "teamT": "0",
        "teamPct": ".000",
        "teamGB": "8.0",
        "teamGP": "8",
        "teamRA": "108",
        "teamDivision": "0-8-0"
      }
      {
        "teamName": "Mount Kisco Chiefs, NY",
        "teamW": "0",
        "teamL": "8",
        "teamT": "0",
        "teamPct": ".000",
        "teamGB": "8.0",
        "teamGP": "8",
        "teamRA": "108",
        "teamDivision": "0-8-0"
      }
    ]
  },

Just keep in mind that I have cut out a significant amount of the data provided in the JSON so it is easily viewable.

I would like to decode this data using SwiftyJSON if possible so I can display it to my user in a UITableView . For now, the UITableView will display the team name in the UITableView.textLabel.text and the teamW and teamL in the UITableView.detailTextLabel.text . How would I decode this data using SwiftyJSON? I am struggling to figure out how this type of structure would be decoded. I would like to use the model that I have created:

struct Standing: Decodable {

var teamName: String
var teamW: Int
var teamL: Int
var teamT: Int
var teamPct: Int
teamGB: Int
teamGP: Int
teamRA: Int
teamDivision: String

}

Answer 1

If you're using Decodable , you don't need to use SwiftyJSON at all, everything's built into Swift itself.

Use this as your model struct:

struct Standing: Codable {
    let success: Bool
    let outputScenario: String
    let data: DataClass
}

struct DataClass: Codable {
    let collection: [Collection]
}

struct Collection: Codable {
    let teamName, teamW, teamL, teamT: String
    let teamPct, teamGB, teamGP, teamRA: String
    let teamDivision: String
}

and parse it like so:

do {
  let standing = try JSONDecoder().decode(Standing.self, from: data)
} catch {
  print(error)
}

Answer 2

Why do you want to use SwiftyJSON as you already adopted Decodable ?

The types in your struct are widely wrong because all values are String . And you need two other structs for the parent objects.

struct Root: Decodable {
    let success : Bool
    let outputScenario : String
    let data : TeamData
}

struct TeamData: Decodable {
    let collection : [Standing]
}

struct Standing: Decodable {
    let teamName, teamW, teamL, teamT: String
    let teamPct, teamGB, teamGP, teamRA: String
    let teamDivision: String
}

Decode the data, the Standing array is in the variable standings .

do {
    let result = try JSONDecoder().decode(Root.self, from: data)
    let standings = result.data.collection
} catch {
    print(error)
}