Swift: Could not cast value of type '__NSCFArr

问题:

I have JSON data from website. I made the main dictionary and I can parse every data except one sub dictionary. I get the error "Swift: Could not cast value of type '__NSCFArray' to 'NSDictionary'"

This example of my data. I cannot parse "weather" but I can parse all other dictionaries like "wind".

   ["name": Mountain View, "id": 5375480, "weather": (
        {
        description = "sky is clear";
        icon = 01n;
        id = 800;
        main = Clear;
    }
), "base": cmc stations, "wind": {
    deg = "129.502";
    speed = "1.41";

Snippet of code

 let windDictionary = mainDictionary["wind"] as! [String : AnyObject
 let speed = windDictionary["speed"] as! Double
 print(speed)
 let weather = mainDictionary["weather"] as! [String : AnyObject]
 print(weather)

回答1:

on behalf your comment...I would say windDictionary is Dictionary...

Dictionary denotes in JSON with {} and 
Array denotes with [] // In printed response you may have array with ()

So, your weather part is Array of Dictionary...You have to parse it like

 let weather = mainDictionary["weather"] as! [[String : AnyObject]]  // although please not use force unwrap .. either use `if let` or `guard` statement