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定义一个数组：
var a:[String]=["File", "Edit", "View", "Navigate"]
定义一个字典：
var airports: [String: String] = ["YYZ": "Toronto Pearson", "DUB": "Dublin"]
定义一个NSMutableDictionary数组
var a:[String]=["File", "Edit", "View", "Navigate"] var d: NSMutableDictionary = ["Xcode": "name", "6.1.1": "version", "qq":a]
将字典转化为json数据：
var jsonData = NSJSONSerialization.dataWithJSONObject(dictionary, options:nil, error: nil)
将json转化为字典数据：
let jsonDatas = NSJSONSerialization.JSONObjectWithData(jsonData!, options: .MutableContainers, error: nil) as NSDictionary
json与服务器进行数据交互
1、用NodeJs建立一个简单的web服务，吐出json数据：
var http=require(‘http‘) var port = ‘8081‘ var data = {‘name‘: ‘jifeng‘, ‘company‘: ‘taobao‘}; http.createServer(function (req, res) { res.writeHead(200, {‘Content-Type‘: ‘text/html; charset=UTF-8‘,‘Server‘:‘NodeJs‘}); res.end(JSON.stringify(data)); }).listen(port, "127.0.0.1");
2、用swift原生类请求数据：
var url = NSURL(string: "http://localhost:8081") var request = NSURLRequest(URL: url!) NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler:{ (response, data, error) -> Void in if (error? != nil) { //Handle Error here print(error) }else{ let jsonData = NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers, error: nil) as NSDictionary println(jsonData) //Handle data in NSData type } })
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原文地址：http://www.cnblogs.com/ericjun/p/4177781.html
