for Birkhoff Lee

for Birkhoff Lee

//
//  ViewController.swift
//  test
//
//  Created by 張子晏 on 2016/7/30.
//  Copyright © 2016年 張子晏. All rights reserved.
//

import UIKit
import SwiftHTTP

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        convertCurrency({ double, error in
            guard error == nil else {
                print(error)
                return
            }
            if let number = double {
                print(number)
            }
        })
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    func convertCurrency(callback: (Double?, String?) -> Void) {
        do {
            let opt = try HTTP.GET("http://apilayer.net/api/live?access_key=8f38982e14966d223058041d9307f536&currencies=TWD&source=USD&format=1")
            
            opt.start { response in
                if let err = response.error {
                    callback(0.0, err.localizedDescription);
                }
                do {
                    let json = try NSJSONSerialization.JSONObjectWithData(response.data, options: NSJSONReadingOptions.MutableContainers)
                    if let quotes = json["quotes"] {
                        if let q = quotes {
                            if let usdtwd = q["USDTWD"] {
                                callback(usdtwd as? Double, nil)
                            }
                        }
                    }
                } catch {
                    callback(0.0, "nsjosn error")
                }
            }
        } catch {
            callback(0.0, "http get error")
        }
    }
    
}