JSon

// JSon

let jsonString = "{\"menu\": {" +

"\"id\": \"file\"," +

"\"value\": \"File\"," +

"\"popup\": {" +

"\"menuitem\": [" +

"{\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"}," +

"{\"value\": \"Open\", \"onclick\": \"OpenDoc()\"}," +

"{\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}" +

"]" +

"}" +

"}}"

let json: Any = try! JSONSerialization.jsonObject(

with: jsonString.data(using: .utf8, allowLossyConversion: true)!,

options: [])

if let jsonDic = json as? NSDictionary {

if let menu = jsonDic["menu"] as? [String: AnyObject] {

if let popup: AnyObject = menu["popup"] {

if let popupDic = popup as? [String: AnyObject] {

if let menuItems: AnyObject = popupDic["menuitem"] {

if let menuItemsArr = menuItems as? [AnyObject] {

if let item0 = menuItemsArr[0]

as? [String: AnyObject] {

if let value: AnyObject = item0["value"] {

print(value)

}

}

}

}

}

}

}

}

if let jsonDic = json as? NSDictionary,

let menu = jsonDic["menu"] as? [String: AnyObject],

let popup = menu["popup"],

let popupDic = popup as? [String: AnyObject],

let menuItems = popupDic["menuitem"],

let menuItemsArr = menuItems as? [AnyObject],

let item0 = menuItemsArr[0] as? [String: AnyObject],

let value = item0["value"]

{

print(value)

}

// 这个使用了 SwiftJson, 类似的框架还有 json-swift

/*

https://github.com/SwiftyJSON/SwiftyJSON

https://github.com/owensd/json-swift

*/

if let value = JSON(json)["menu"]["popup"]["menuitem"][0]["value"].string {

print(value)

}