17.Swift 原生网络通信

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IOS9.0后，就打算废弃NSURLConnection，主推NSURLSession

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sendSynchronousRequest

同步Request
NSURLConnection.sendSynchronousRequest(request: NSURLRequest, returningResponse response: AutoreleasingUnsafeMutablePointer<NSURLResponse?>) throws -> NSData

    func usingSendSynchronousRequest(){        do{            var response:NSURLResponse?            // 发同步请求            let data:NSData = try NSURLConnection.sendSynchronousRequest(NSURLRequest(URL: NSURL(string: "http://www.baidu.com")!), returningResponse: &response)            if let d:NSData = data {                NSLog("\(NSString(data: d, encoding: NSUTF8StringEncoding))")            }            if let r:NSURLResponse = response{                NSLog("\(r)")            }        }catch let error as NSError{            NSLog("\(error.localizedDescription)")        }    }

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sendAsynchronousRequest

异步Request
NSURLConnection.sendAsynchronousRequest(request: NSURLRequest, queue: NSOperationQueue, completionHandler handler: (NSURLResponse?, NSData?, NSError?) -> Void)

    func usingSendAsynchronousRequest(){        // 异步请求        NSURLConnection.sendAsynchronousRequest(NSURLRequest(URL: NSURL(string: "http://www.baidu.com")!), queue: NSOperationQueue()) { (resp:NSURLResponse?, data:NSData?, error:NSError?) -> Void in            if let e:NSError = error{                NSLog("\(e.localizedDescription)")            }else{                NSLog("\(NSString(data: data!, encoding: NSUTF8StringEncoding))")            }        }    }

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NSURLSession

NSURLSession实例化一个网络请求task
NSURLSession.dataTaskWithRequest(request: NSURLRequest, completionHandler: (NSData?, NSURLResponse?, NSError?) -> Void) -> NSURLSessionDataTask

    func usingNSURLSession(){        let session = NSURLSession.sharedSession()        let request = NSURLRequest(URL: NSURL(string: "http://baidu.com")!)        let task = session.dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in            let string = NSString(data: data!, encoding: NSUTF8StringEncoding)            NSLog("\(string)")        })        task.resume()    }