swift基础值网络请求

概述NSURLSessionDownloadDelegate class ViewController: UIViewController, NSURLSessionDownloadDelegate { var session = NSURLSession() @IBOutlet weak var imagen: UIImageView! @IBOutlet

NSURLSessionDownloadDelegate

class VIEwController: UIVIEwController,NSURLSessionDownloadDelegate {        var session = NSURLSession()        @IBOutlet weak var imagen: UIImageVIEw!    @IBOutlet weak var progreso: UIProgressVIEw!        @IBAction func cargar(sender: UIbutton) {        let imageUrl: Nsstring = "http://c.hiphotos.baIDu.com/image/pic/item/8cb1cb13495409235fa14adf9158d109b2de4942.jpg"        let getimageTask: NSURLSessionDownloadTask =        session.downloadTaskWithURL(NSURL(string: imageUrl as String)!)        getimageTask.resume()    }    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        let sessionConfig =        NSURLSessionConfiguration.defaultSessionConfiguration()        session = NSURLSession(configuration: sessionConfig,delegate: self,delegateQueue: nil)    }        overrIDe func dIDReceiveMemoryWarning() {        super.dIDReceiveMemoryWarning()    }        func URLSession(session: NSURLSession,downloadTask: NSURLSessionDownloadTask,dIDFinishDownloadingToURL location: NSURL){        print("Download finished")        let downloadedImage = UIImage(data: NSData(contentsOfURL: location)!)        dispatch_async(dispatch_get_main_queue(),{() in            self.imagen.image = downloadedImage        })    }        func URLSession(session: NSURLSession,dIDWriteData bytesWritten: Int64,totalBytesWritten: Int64,totalBytesExpectedToWrite: Int64){        dispatch_async(dispatch_get_main_queue(),{() in            let variable = float(totalBytesWritten)/float(totalBytesExpectedToWrite)            self.progreso.progress = variable        }) }        }

NSURLSession

import UIKitclass VIEwController: UIVIEwController {        @IBOutlet weak var city: UILabel!    @IBOutlet weak var temperatureCelsius: UITextFIEld!    @IBOutlet weak var temperatureCelsiusMax: UITextFIEld!    @IBOutlet weak var temperatureCelsiusMin: UITextFIEld!    @IBOutlet weak var temperatureKelvin: UITextFIEld!    @IBOutlet weak var temperatureKelvinMax: UITextFIEld!    @IBOutlet weak var temperatureKelvinMin: UITextFIEld!    @IBOutlet weak var humIDity: UITextFIEld!    @IBOutlet weak var wind: UITextFIEld!        overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()                let sessionConfig: NSURLSessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()        sessionConfig.allowsCellularaccess = false        //only accept JsON answer        sessionConfig.httpAdditionalheaders = ["Accept":"application/Json"]        //timeouts and connections allowed        sessionConfig.timeoutIntervalForRequest = 30.0        sessionConfig.timeoutIntervalForResource = 60.0        sessionConfig.httpMaximumConnectionsPerHost = 1        //create session,assign configuration        let session = NSURLSession(configuration: sessionConfig)        session.dataTaskWithURL(NSURL(string: "http://API.openweathermap.org/data/2.5/weather?q=barcelona,es&appID=2de143494c0b295cca9337e1e96b00e0")!,completionHandler: {(data,response,error) in            let dic:NSDictionary = (try? NSJsONSerialization.JsONObjectWithData(data!,options:NSJsONReadingOptions(rawValue: 0))) as? NSDictionary ?? [String:String]()                        if dic.count == 0 {                return            }                        print(dic)                        let city: Nsstring = (dic["name"] as! Nsstring)            let kelvin: AnyObject! = (dic["main"] as! NSDictionary) ["temp"]            let kelvin_min: AnyObject! = (dic["main"] as! NSDictionary) ["temp_min"]            let kelvin_max: AnyObject! = (dic["main"] as! NSDictionary) ["temp_max"]            let celsius = kelvin as! float - 274.15 as float            let celsius_min = kelvin_min as! float - 274.15 as float            let celsius_max = kelvin_max as! float - 274.15 as float            let humIDity: AnyObject! = (dic ["main"] as! NSDictionary) ["humIDity"]            let wind: AnyObject! = (dic ["wind"] as! NSDictionary) ["speed"]                        //original thread            dispatch_async(dispatch_get_main_queue(),{ () in                self.city.text = "\(city)"                self.temperatureCelsius.text = "\(celsius)"                self.temperatureCelsiusMax.text = "\(celsius_max)"                self.temperatureCelsiusMin.text = "\(celsius_min)"                self.temperatureKelvin.text = "\(kelvin)"                self.temperatureKelvinMax.text = "\(kelvin_max)"                self.temperatureKelvinMin.text = "\(kelvin_min)"                self.humIDity.text = "\(humIDity)"                self.wind.text = "\(wind)"            })        }).resume()    }        overrIDe func dIDReceiveMemoryWarning() {        super.dIDReceiveMemoryWarning()    }    }

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