ios - 获取嵌套 JSON 中的每个对象

Question

所以在这里您可以看到我获取 JSON 的方法。我的问题是我希望我的循环遍历每个对象。没有一个物体像现在这样 10 倍。我知道 player["1"] 导致它重复获取第一个对象，这只是为了示例。我需要获取每个 player 信息。有人可以修正这个逻辑并稍微解释一下情况吗。

var homeTeamPlayers: [MatchUp]? = []

let urlRequest = URLRequest(url: URL(string: "http://www.fibalivestats.com/data/586746/data.json")!)

func fetchHomeTeam() {

    let task = URLSession.shared.dataTask(with: urlRequest) { (data,response,error) in

        if error != nil {
            print(error!)
            return
        }

        homeTeamPlayers = [MatchUp]()

        do {
            let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String : AnyObject]

            if let teamsFromJSON = json["tm"] as? [String : AnyObject] {
                if let homeTeam = teamsFromJSON["1"] as? [String : AnyObject] {
                    if let player = homeTeam["pl"] as? [String : AnyObject] {
                        for _ in player {
                            let homeTeamPlayer = MatchUp()
                            if let firstPlayer = player["1"] as? [String : AnyObject] {
                                if let name = firstPlayer["name"] as? String {

                                    homeTeamPlayer.homeTeam_name = name

                                }
                            }

                            homeTeamPlayers?.append(homeTeamPlayer)
                        }
                    }
                }
            }    
        } catch let error {
            print(error)
        }   
    } 

    task.resume()
}

这是我想要获取的 JSON...

{

    tm: {
        1: {

            pl: {
                1: {

                    name: "R. Miniotas"

                },
                2: {

                    name: "T. Delininkaitis"

                },
                3: {

                    name: "V. Cizauskas"

                },
                4: {

                    name: "T. Klimavicius"

                },
                5: {

                    name: "V. Lipkevicius"

                },
                6: {

                    name: "M. LinkeviÄius"

                },
                7: {

                    name: "D. Seskus"

                },
                8: {

                    name: "T. Michnevicius"

                },
                9: {

                    name: "D. Gvezdauskas"

                },
                11: {

                    name: "A. Valeika"

                }
            }

Answer 1

您需要使用 for (key, value) in 语法枚举字典:

if let players = homeTeam["pl"] as? [String : Any] {
   for (_, value) in players {
       let homeTeamPlayer = MatchUp()
       if let currentPlayer = value as? [String : Any],
          let name = currentPlayer["name"] as? String {
          homeTeamPlayer.homeTeam_name = name
       }

       homeTeamPlayers?.append(homeTeamPlayer)
   }
}

但是为了避免空的 Matchup 实例，我建议

if let players = homeTeam["pl"] as? [String : Any] {
  for (_, value) in players {
       if let currentPlayer = value as? [String : Any],
          let name = currentPlayer["name"] as? String {
             let homeTeamPlayer = MatchUp()
             homeTeamPlayer.homeTeam_name = name
             homeTeamPlayers?.append(homeTeamPlayer)
       }   
   }
}

注意:Swift 3 中的 JSON 字典是 [String:Any] 为什么 homeTeamPlayers 数组是可选的？

最后 - 一如既往 - .mutableContainers 在 Swift 中完全没有意义。