使用 SwiftyJSON 解析 JSON 字段

Parsing JSON Field Using SwiftyJSON

请原谅我的天真,但我正在逐步解构一个 SwiftyJSON 示例项目以满足我的需要。现在,我有一个包含以下内容的 AppDelegate 文件;

 import UIKit
 import SwiftyJSON

 @UIApplicationMainclass AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    let navigationController = self.window?.rootViewController as! UINavigationController
    let viewController = navigationController.topViewController as! ViewController

    let url = NSURL(string: "http://myurl/json/")
    let request = NSURLRequest(URL: url!)
    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: {(response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in
        if error == nil {
            let json = JSON(data: data!)

            for (key, subJson) in json {
                if let userName = subJson["userName"].string {
                    println(userName)
                }
            }

            viewController.json = json
        }
        else {
            println("Error: \(error.localizedDescription)")
        }
    })

    return true
    }
}

当我 运行 应用程序时,这似乎在打印 "userName" 字段方面非常成功。我现在遇到的障碍是弄清楚如何将我的 "userName" 数据传递到我的 ViewController 文件,并让它在我的单元格中显示为文本标签。尽管我做出了努力,但我只能将单元格标记为 "null,",这让我相信我的 AppDelegate 中正在解析的内容无法从 ViewController 文件访问。听起来对吗?

提前致谢!

尝试通过以下方式访问您想要的 UIViewController

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject :AnyObject]?) -> Bool {

    self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
    var storyboard = UIStoryboard(name: "Main", bundle: nil)

    // You need to cast to the name of your ViewController to acces to its fields after.
    var initialViewController = storyboard.instantiateViewControllerWithIdentifier("ViewController") as! ViewController

    // set the JSON value to the ViewController here.        
    initialViewController.json = json

    self.window?.rootViewController = initialViewController
    self.window?.makeKeyAndVisible()
}

您必须在 Interface Builder 中为您想要的 UIViewController 设置 Storyboard ID。通过上述方式,您可以保护对 hold 的引用,将 UIViewController 设置为您想要的 rootViewController.

希望对你有所帮助。