基于swift3.0的网络请求

//MARK: - 发送请求 func request(httpUrl: String, httpArg: String) { //初始化请求 let req = NSMutableURLRequest(url: NSURL(string: httpUrl + "?" + httpArg)! as URL) //设置请求超时 req.timeoutInterval = 5 //设置请求方式 req.httpMethod = "GET" req.cachePolicy=NSURLRequest.CachePolicy.returnCacheDataElseLoad req.addValue("29d8f8163b8ad4894b3fa4db401bade8", forHTTPHeaderField: "apikey") let session=URLSession.shared let dataTask=session.dataTask(with: req as URLRequest) { (data, response, error) in if error != nil{ //如果请求过程出错 self.loadMoreBtn?.setTitle("加载失败，点击重试", for: UIControlState.normal) self._aiv.stopAnimating() self.loadMoreBtn?.isHidden=false }else{ let content = NSString(data: data!, encoding: String.Encoding.utf8.rawValue) print(content) //下次请求的页码加一 self.i=self.i+1 do{ let dict0:NSDictionary=try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary let dict1:NSDictionary=dict0["showapi_res_body"]as! NSDictionary let dict2:NSDictionary=dict1["pagebean"]as! NSDictionary let array:NSArray=dict2["contentlist"] as! NSArray //数据转模型 let conArray=Contents.ContentsWhithArray(array: array) as NSArray //添加到数据源中 for con in conArray{ self.message.add(con) } }catch{ //解析出现异常 } //回到主线程更新tableView DispatchQueue.main.async(execute: { self.tableView.reloadData() self._aiv.stopAnimating() self.loadMoreBtn?.isHidden=false self.loadMoreBtn?.setTitle("点击加载更多", for: UIControlState.normal) }) } } //发送请求 dataTask.resume() }