如何從我的JSON中使用SwiftyJSON獲取選定元素並將其打印在控制檯上？

Question

我有一個選擇的形式返回數據的Web服務：

[{"_id":"56c861d0bcb42e075f7d47bd", 
"username":"Shaylee Thompson", 
"photo":"photo.jpg", 
"number":"one", 
"description":"Aut officia et ipsam. Dolorem pariatur molestiae sed saepe voluptatem voluptatem. Non maiores doloribus quis eum reprehenderit fugit vitae.", 
"__v":0, 
"updated_at":"2016-02-20T12:53:36.931Z", 
"created_at":"2016-02-20T12:53:36.922Z", 
"location":{ 
    "type":"Point", 
    "coordinates":[-3.2880974020993934,49.8319259687921]} 
}, 
{"_id":"55a9253297b21080ac8", 
"username":"Eve Notter", 
"photo":"photo.jpg", 
"number":"two", 
"description":"Aut officia et ipsam. Dolorem pariatur molestiae sed saepe voluptatem voluptatem. Non maiores doloribus quis eum reprehenderit fugit vitae.", 
"__v":0, 
"updated_at":"2016-02-20T12:53:36.931Z", 
"created_at":"2016-02-20T12:53:36.922Z", 
"location":{ 
    "type":"Point", 
    "coordinates":[-2.212142,41.14321231]} 
}, 
etc. 

，我想在我的控制檯location，username和description從每個記錄上面顯示。

我創建了一個名爲RestManager.swift類，它包含兩個方法：

static let sharedInstance = RestApiManager() 

func getRandomUser(onCompletion: (JSON) -> Void) { 
    let route = baseURL 
    makeHTTPGetRequest(route, onCompletion: { json, err in 
     onCompletion(json as JSON) 
    }) 
} 

func makeHTTPGetRequest(path: String, onCompletion: ServiceResponse) { 
    let request = NSMutableURLRequest(URL: NSURL(string: path)!) 

    let session = NSURLSession.sharedSession() 

    let task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in 
     let json:JSON = JSON(data: data!) 
     onCompletion(json, error) 
     // if I put print(json) then I see the whole json in console 
    }) 
    task.resume() 
} 

，然後在不同的I類寫道：

override func viewDidLoad() { 
    getDummyData() 
} 

func getDummyData() { 
    RestApiManager.sharedInstance.getRandomUser { json in 
     let results = json["username"] 
     for (index: String, subJson: JSON) in results { 
      let user: AnyObject = JSON["username"].object 
      dispatch_async(dispatch_get_main_queue(),{ 
       print(user) //does not print anything so far 
      }) 
     } 
    } 
} 

所以我的問題是 - 我應該如何修改我的getDummyData方法，以便我可以在控制檯中看到我的JSON元素？

Answer 1

func getDummyData() { 

    RestApiManager.sharedInstance.getRandomUser { json in 

     for (index: String, subJson: JSON) in json { 
      let user: AnyObject = subjson["username"].object 
      dispatch_async(dispatch_get_main_queue(),{ 
       print(user) 
      }) 
     } 
    } 
}