json - 在 Swift 中从 JSON 文件中获取值

Question

我有一个 JSON 文件，我将其转换为 NSDictionary 对象。我的问题是如何从该对象中获取一个值？我在我的网站上创建了一个 httppost，然后我得到了一个 JSON 数组，其中包含值“success”和“userId”我想检查成功是真还是假。

import UIKit

class ViewController2: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func HttpBtn(sender: AnyObject) {
    PostToServer()
    HttpPost()
}

func PostToServer()
{
    println("Button Presed")
}

func HttpPost()
{
    var postString = "email=joakim@and.dk&password=123456"

    //Declare URL
    var url: NSURL! = NSURL(string: "http://95.85.53.176/nhi/api/app/login")
    var request: NSMutableURLRequest = NSMutableURLRequest(URL: url)

    //Declare which HTTPMethod
    request.HTTPMethod = "POST"

    //POST data
    request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)

    let task = NSURLSession.sharedSession().dataTaskWithRequest(request){
        data, response, error in

        if error != nil
        {
            println("error=\(error)")
            return
        }

        println("response =\(response)")

        var responseString = NSString(data: data, encoding:    NSUTF8StringEncoding)

        println("responseString =\(responseString)")


        var error: NSError?

        var myJSON = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &error) as? NSDictionary

        println(myJSON)
    }



    task.resume()


}

}

输出

responseString =Optional({"success":true,"userId":"62"})
Optional({
success = 1;
userId = 62;
})

Answer 1

您可以使用它的键值访问

var success = myJSON["success"]!.intValue
var userId = myJSON["userId"]!.intValue

if(success == 1) //if true
{
  //Do something   
}

与userId相同