如何从此JSON数组中取出此特定节点？

Question

我在Xcode中返回了一个数组，输出以下内容：

   ["userDetails": {
     id = 31;
     "user_email" = "steve@gmail.com";
     "user_name" = "Steve Downs";
     }, "communities": <__NSArrayI 0x600000245f40>(
     {
     id = 5;
     name = South;
     },
     {
     id = 13;
     name = HurraHarry;
     },
     {
     id = 15;
     name = EnclliffeT;
     }
     )
     ]

以下代码正确地将“社区”中包含的值分配给各自的变量。

let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:AnyObject]
                  print (json!)

if let arr = json?["communities"] as? [[String:String]] {
                        self.communitiesArray = arr.flatMap { $0["name"]!}
                        self.communityIdsArray = arr.flatMap { $0["id"]!}
                        }

                    if let arr = json?["userDetails"] as? [AnyObject] {

                        self.playerId = (arr.flatMap { $0["id"]!} as (AnyObject)) as! [String]
                        print (self.playerId);
                    }

但是，我在id分配"userDetails"时遇到问题。如何从id获取"userDetails"并将其分配给self.playerId？

Answer 1

您可以尝试这样的事情

if let dict = json?["userDetails"] as? [String:String] {
    self.playerId = dict["id"]
}

Answer 2

我认为正确的是：

guard let item = json?["userDetails"] as? [String: AnyObject],
  self.playerId = item["id"] as? Int else {
    return;
}