如何从Swift 3中的字典中检索值

Question

我有这个函数从中获取用户FireBase并将其转换为Dictionary:

 let leaderBoardDB = FIRDatabase.database().reference().child("scores1").queryOrderedByValue().queryLimited(toLast: 5)
        leaderBoardDB.observe( .value, with: { (snapshot) in
            print("scores scores", snapshot)

            if let dictionary = snapshot.value as? [String: Any] {
                for playa in dictionary {
                    let player = Player()

                    print("plaaaaayyyyyaaaaa", playa)
                    print("plaaaaayyyyyaaaaa key", playa.key)
                    print("plaaaaayyyyyaaaaa.value", playa.value)
                        player.id = playa.key
                    print(playa.key["name"])

                }
            }   
          }, withCancel: nil)
    }

我得到这个结果:

plaaaaayyyyyaaaaa("inovoID",{name = Tatiana; points = 6;})plaaaaayyyyyaaaaa key inovoID plaaaaayyyyyaaaaa.value {name = Tatiana; points = 6; } aaaa i id可选("inovoID")

问题是我无法获得用户的名称和要点.当我尝试使用:

print(playa.key["name"])

它给了我这个错误:

无法使用类型为"String"的索引下标"String"类型的值

有谁可以帮我这个,拜托？

Answer 1

因为你的JSON是

"inovoID" : { "name" : "Tatiana", "points" : 6 }

• playa.key 是 "inovoID"
• playa.value 是 { "name" : "Tatiana", "points" : 6 }

的关键是String,不能下标.这就是错误所说的.

您需要订阅值并安全地转换类型以帮助编译器.

if let person = playa.value as? [String:Any] {
   print(person["name"] as! String)
}