如何从字典数组中获取数据 - swift

Question

如何从这个数组中获取数据？ 这里有一个包含一些键值对的数组，一些键包含一个字典数组。

 var dataArray = [
                ["teamName":"Arsenal",
                  "image":"imageName",
                  "nextMatch":"in 2 days",
                  "matches":[
                                ["oppositeTeam":"teamName",
                                 "matchTimings":"121212",
                                 "matchId":"ID 213432"],
                                ["oppositeTeam":"teamName",
                                 "matchTimings":"121212",
                                 "matchId":"ID 213432"]
                            ],
                  "fixtures":[
                                ["oppositeTeam":"teamName",
                                 "oppositeTeamScore":"7",
                                 "HomeTeamScore":"4",
                                 "HomeTeamCards":"True",
                                 "oppositeTeamCards":"false",
                                 "fixturesId":"ID 213432"],

                            ]
    ],["teamName":"Chelsea",
        "image":"imageName",
       "nextMatch":"in 2 days",
       "matches":[["oppositeTeam":"teamName",
                   "matchTimings":"121212",
                   "matchId":"ID 213432"],["oppositeTeam":"teamName",
                                           "matchTimings":"121212",
                                           "matchId":"ID 213432"]
        ],"fixtures":[["oppositeTeam":"teamName",
                       "oppositeTeamScore":"7",
                       "HomeTeamScore":"4",
                       "HomeTeamCards":"True",
                       "oppositeTeamCards":"false",
                       "fixturesId":"ID 213432"],["oppositeTeam":"teamName",
                                                  "oppositeTeamScore":"7",
                                                  "HomeTeamScore":"4",
                                                  "HomeTeamCards":"True",
                                                  "oppositeTeamCards":"false",
                                                  "fixturesId":"ID 213432"]
        ]
    ],["teamName":"India",
        "image":"imageName",
       "nextMatch":"null",
       "matches":[],
       "fixtures":[]
    ]]

我试过了，但我无法从这个数组中获取数据。

Answer 1

你需要使用这样的模型

struct Team {
    let teamName:String
    let image:String
    let nextMatch:String
    let matches:[Match]?
    let fixtures:[Fixture]?
}

struct Match {
    let oppositeTeam:String
    let matchTimings:String
    let matchId:String
}

struct Fixture {
    let oppositeTeam:String
    let oppositeTeamScore:String
    let HomeTeamScore:String
    let HomeTeamCards:String
    let oppositeTeamCards:String
    let fixturesId:String
}

接下来你需要快速了解Codeable，我在下面附上了一篇文章

Codeable Tutorial in swift

Answer 2

以下是访问dataArray 中定义的数组/字典的方法：

    // To access team object at zero index
    if let team = dataArray[0] as? [String: Any] {
        print("Team: \(team["teamName"])")

        // To access matches array of team object at zero index
        if let matches = team["matches"] as? [[String: Any]] {
            print( matches)

            // To access first match
            if let match = matches.first {
                print(match)
            }
        }

        // Similar to matches access fixtures
        if let fixtures = dataArray[0]["fixtures"] as? [[String: Any]] {
            print(fixtures)

            // To access first fixture
            if let fixture = fixtures.first {
                print(fixture)
            }
        }
    }

如果您只是进行原型设计，这没关系。如果您打算将其扩展到实际应用程序中，则创建单独的模型是最好的方法。

您可以拥有一个团队模型，其中可以包含团队名称、图像以及比赛和赛程。对于匹配，您可以创建一个包含匹配信息的模型。同样，您也可以为固定装置创建模型。然后，您的 Team 类将包含 Match 和 Fixture 类的数组，如下所示：

var matches: [Match]
var fixtures: [Fixture]

而您的dataArray 将是

类型

var dataArray: [Team]

Answer 3

使用 Codable 为您的数据创建模型。使用 JSON 解码器解析模型中的数据。然后，您可以在任何地方使用您的模型。

对于 JSON 解析，你可以参考这个教程：- https://medium.com/xcblog/painless-json-parsing-with-swift-codable-2c0beaeb21c1

Answer 4

你可以像这样从你的数组中获取数据：

for attributesObj in dataArray{
      let dicFrmArray = attributesObj as! NSDictionary

       if ((dicFrmArray["teamName"] as? NSNull) == nil && dicFrmArray["teamName"] != nil){
     print(dicFrmArray[teamName"])

       }
}