Firebase如何获取NSDictionary数据

Question

我想获得一些数据在用户配置文件中，我有一些信息，但我被困在这一个。

火力地堡数据库：

下面是我的一些代码：

self.ref.child("users").child("profile").observe(.childAdded, with: { (snapshot) in 


     if let dictionary = snapshot.value as? [String:Any] { 

      let user = User() 

      let brands = dictionary["status"] as! NSDictionary 


      user.displayname = dictionary["displayname"] as? String 
      user.isconnected = brands["isconnected"] as? String 

      print(user.isconnected) //fatal error: unexpectedly found nil while unwrapping an Optional value 


class User: NSObject { 
    var displayname: String? 
    var isconnected: String? 
} 

Answer 1

尝试类似的东西：

guard let dictionary = snapshot.value as? [String: Any] else { 
    return 
} 

guard let statusDictionary = dictionary["status"] as? [String: Any] else { 
    return 
} 

guard let deviceStatusDictionary = statusDictionary["DEVICE_KEY"] as? [String: Any] else { 
    return 
} 

let user = User() 

user.displayname = dictionary["displayname"] as? String 
user.isconnected = deviceStatusDictionary["isconnected"] as? Bool 

你需要知道你的设备密钥。

和：

class User: NSObject { 
    var displayname: String? 
    var isconnected: Bool? 
}