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Question

let json: [AnyObject] = {
            "response": "get_nearby_deals",
            "userID": "12345", 
            "demo":[{"deal_code":"iD1612061"}]
            }

如何在 Swift 中声明字典？我是 Swift 的新手。完全卡住了。

Answer 1

您已使用[AnyObject] 声明Array，只需将其更改为[String: Any] 并将大括号{} 替换为方括号[]。

let json: [String: Any] = [
                           "response": "get_nearby_deals",
                           "userID": "12345", 
                           "demo":[["deal_code":"iD1612061"]]
                          ]

您可以像这样使用subscript 从Dictionary 检索值。

let userID = json["userID"] as! String
//Above will crash if `userID` key is not exist or value is not string, so you can use optional wrapping with it too.
if let userID = json["userID"] as? String {
    print(userID)
}

//`demo` value is an array of [String:String] dictionary(s)
let demo = json["demo"] as! [[String:String]]
//Same here as the previous `userID`, it will crash if 'demo' key is not exist, so batter if you optionally wrapped it:
if let demo = json["demo"] as? [[String:String]] {
    print(demo)
}