swift http post json + 登录

var nsUrl : NSURL = NSURL(string:API_HOST+"/"+LOGIN_API)!

var request = NSMutableURLRequest(URL:nsUrl)

request.HTTPMethod = "POST"

var postKeyJson : NSString = "\(LOGINPOSTKEY)"+"="+"{\"email\":\"\(username)\",\"password\":\"\(userpass)\"}"

request.HTTPBody = NSString(format: postKeyJson).dataUsingEncoding(NSUTF8StringEncoding)

NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: {(response:NSURLResponse!,data:NSData!,error:NSError!) -> Void in

if error != nil{

println(error)

var alert = UIAlertView(title: "提示", message:"请求发生错误,可能是网络未连接,请检查", delegate: self, cancelButtonTitle: "好的")

alert.show()

return

}

//var result = NSString(data: data, encoding: NSUTF8StringEncoding)

// swiftyJSON

var jsonResult = JSON(data: data!)

// traditional method

//var jsonResult : NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary

//println(jsonResult)

// 1 username is not exist; 2 password is wrong;  0 success

if (jsonResult["result"] == 1) {

var alert = UIAlertView(title: "提示", message:"用户名不存在！", delegate: self, cancelButtonTitle:"取消")

alert.show()

return

}else if(jsonResult["result"] == 2) {

var alert = UIAlertView(title: "提示", message:"密码错误！", delegate: self, cancelButtonTitle:"取消")

alert.show()

return

}else if ((jsonResult["result"] == 0) && (jsonResult["access_token"] != nil)) {

var alert = UIAlertView(title: "提示", message:"登录成功！", delegate: self, cancelButtonTitle:"确定")

alert.show()

self.presentViewController(indexController, animated: true, completion: nil)

}

})