使用Swift从AFNetworking访问JSON数据

概述我通过代码中的链接访问了Yahoo Finance数据集.它在调试窗口中执行并打印 JSON数据.如何在myNameLabel中存储然后打印选定的字段.例如“symbol”或“LastTradePriceOnly”字段？ class ViewController: UIViewController { @IBOutlet weak var myNameLabel: UILabel! 我通过代码中的链接访问了Yahoo Finance数据集.它在调试窗口中执行并打印 JSON数据.如何在mynameLabel中存储然后打印选定的字段.例如“symbol”或“LastTradePriceOnly”字段？

class VIEwController: UIVIEwController {    @IBOutlet weak var mynameLabel: UILabel!    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        // Do any additional setup after loading the vIEw,typically from a nib.        let manager = AFhttpRequestoperationManager()        manager.GET( "https://query.yahooAPIs.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quote%20where%20symbol%20in%20(%22AAPL%22)&format=Json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=",parameters: nil,success: { (operation: AFhttpRequestoperation!,responSEObject: AnyObject!) in                println("JsON: " + responSEObject.description)                //How to access and print indivIDual fIElds?            },failure: { (operation: AFhttpRequestoperation!,error: NSError!) in                println("Error: " + error.localizedDescription)            })    }    overrIDe func dIDReceiveMemoryWarning() {        super.dIDReceiveMemoryWarning()        // dispose of any resources that can be recreated.    }}

解决方法 您可以只导航嵌套字典的结构,可能是这样的：

manager.GET( "https://query.yahooAPIs.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quote%20where%20symbol%20in%20(%22AAPL%22)&format=Json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=",success: {        operation,responSEObject in        if let quote = responSEObject?.objectForKey("query")?.objectForKey("results")?.objectForKey("quote") as? NSDictionary {            let symbol = quote.objectForKey("Symbol") as? String            let lastTradePriceOnly = quote.objectForKey("LastTradePriceOnly") as? String            println("results: \(symbol) @ \(lastTradePriceOnly)")        } else {            println("no quote")        }    },failure: {        operation,error in        println("Error: " + error.localizedDescription)    })

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