JSON异步获取网络数据

//定义一个方法来获取网络数据,接受参数为网址

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()) { (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?.didReceiveResults(jsonResult)

}

}