使用NSURLConnection.sendAsynchronousRequest()可以采用异步获取的方式取得数据。下面通过对数据获取类进行封装，演示如何进行数据请求与接收。
1，HttpController.swift （数据获取封装类，结果处理协议）
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import UIKit
//自定义http协议protocol HttpProtocol{
//定义一个方法接收一个字典
func didRecieveResults(resultes:NSDictionary)
}class HttpController:NSObject{
//定义一个可选代理
var delegate:HttpProtocol?
//定义一个方法运过来获取网络数据，接收参数为网址
func onSearch(url:String){
//定义一个NSURL
var nsUrl:NSURL=NSURL(string: url)!
//定义一个NSURLRequest
var request:NSURLRequest=NSURLRequest(URL: nsUrl)
//异步获取数据
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(),
completionHandler: {(response:NSURLResponse!,data:NSData!,error:NSError!)->Void in
//由于我们获取的数据是json格式，所以我们可以将其转化为字典。
var jsonResult:NSDictionary=NSJSONSerialization.JSONObjectWithData(data,
options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
//将数据传回给代理
self.delegate?.didRecieveResults(jsonResult)
})
}
} |
2，ViewController.swift （使用样例）
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import UIKit
class ViewController: UIViewController,HttpProtocol {
//获取网络数据的类
var eHttp:HttpController = HttpController()
//接收频道列表的数组
var channelData:NSArray=NSArray()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//为HttpController实例设置代理
eHttp.delegate=self
//获取频道数据
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//实现HttpProtocol协议的方法
func didRecieveResults(results:NSDictionary){
if (results["channels"] != nil){
//如果channels关键字的value不为nil，获取的就是频道数据
self.channelData=results["channels"] as NSArray
println(self.channelData[0]["name"] as String) //私人兆赫
}
}
} |
3，请求数据样例
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{ "channels": [
{
"name_en": "Personal Radio",
"seq_id": 0,
"abbr_en": "My",
"name": "私人兆赫",
"channel_id": 0
},
{
"name": "华语",
"seq_id": 0,
"abbr_en": "",
"channel_id": "1",
"name_en": ""
},
{
"name": "欧美",
"seq_id": 1,
"abbr_en": "",
"channel_id": "2",
"name_en": ""
}
]
} |