Can't get JSON from weather API. iOS

Question

This is the JSON:

{ 
"main":{  
  "temp":-11.67,
  "pressure":1040.21,
  "humidity":73,
  "temp_min":-11.67,
  "temp_max":-11.67,
  "sea_level":1055.37,
  "grnd_level":1040.21
},
"id":3099213,
"name":"London",
"cod":200
}

I've got JSON file and I want to take the value of "name": "London" (London) and save it in the variable cityName, but it doesn't work there is error in line self.cityName = city. Cannot assign value of type [String : AnyObject] to type String!

For example next one that have to save to variable degree temperature from JSON work correct and show temperature.

I don't know how to pick this "name":"London" value and save it to variable. When I modify and put this: self.cityName = city as! String

I've got warning Cast from '[String : AnyObject]' to unrelated type 'String' always fails:

var cityName: String!

let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String : AnyObject]
                
                
                if let main = json["main"] as? [String : AnyObject] {
                    if let temp = main["temp"] as? Int {
                        self.degree = temp
                    }
                }
                if let city = json["name"] as? [String : AnyObject] {
                    self.cityName = city
                }
}

Answer 1

  if let city = json["name"] as? [String : AnyObject] {
       self.cityName = city
  }

Replace to

 if let city = json["name"] as? String {
       self.cityName = city
  }