如何使用 SwiftyJSON 从我的 JSON 中获取选定的元素并将其打印在控制台上？

Posted 2023-03-15

【中文标题】如何使用 SwiftyJSON 从我的 JSON 中获取选定的元素并将其打印在控制台上？

【英文标题】：How can I get selected elements from my JSON using SwiftyJSON and print it on the console?

【发布时间】：2016-02-20 13:47:33

【问题描述】：

我有一个以选定形式返回数据的网络服务：

["_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.

我想在我的控制台中显示上述每条记录中的location、username 和description。

我创建了一个名为 RestManager.swift 的类，其中包含两个方法：

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()

然后在不同的班级我写道：

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
            )
        
    

所以我的问题是 - 我应该如何修改我的 getDummyData 方法以便我可以在控制台中看到我的 JSON 元素？

【参考方案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) 
            )