从服务器 Objective C 或 Swift 下载文件

Question

如何将音频文件从我的服务器下载到用户的手机以在应用程序中使用？当我转到网站链接时，JSON 代码是这样出现的

[{"name":"Lets Party","path":"http:\/\/domain.us\/\/\/audios\/\/Lets Party.wav"},
{"name":"Let You Know","path":"http:\/\/domain.us\/\/\/audios\/\/Let You Know.wav"},
{"name":"OMG","path":"http:\/\/domain.us\/\/\/audios\/\/OMG.wav"}]

我尝试获取 JSON 并在 Swift 中转换它，但这使我的应用程序崩溃。但是当我放一个博客 JSON 时，它运行良好，没有崩溃。如何在 Swift 或 Objective-C 中做到这一点？

编辑：我现在收到一条错误消息。

当前代码：

        let urlPath = "http://www.domain.us/"

        let url = NSURL(string: urlPath)

        let session = NSURLSession.sharedSession()

        let task = session.dataTaskWithURL(url, completionHandler: {data, response, error -> Void in

            if error != nil {
                println(error)
            } else {
                let jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
                println(jsonResult)
            }

        })

        task.resume()
    }

错误信息：

2014-11-12 20:07:23.652 JSON Practice[6073:284290] CFNetwork SSLHandshake failed (-9847)
2014-11-12 20:07:23.874 JSON Practice[6073:284290] CFNetwork SSLHandshake failed (-9847)
2014-11-12 20:07:24.054 JSON Practice[6073:284290] CFNetwork SSLHandshake failed (-9847)
2014-11-12 20:07:24.055 JSON Practice[6073:284290] NSURLConnection/CFURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9847)
Error Domain=NSURLErrorDomain Code=-1200 "The operation couldn’t be completed. (NSURLErrorDomain error -1200.)" UserInfo=0x7fc0ba656020 {NSErrorFailingURLStringKey=https://www.domain.us/, NSErrorFailingURLKey=https://www.makemeip.us/, _kCFStreamErrorDomainKey=3, _kCFStreamErrorCodeKey=-9847, NSUnderlyingError=0x7fc0ba52ebb0 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error -1200.)"}

Answer 1

//
//  ViewController.swift
//  Test2
//
//  Created by adm on 11/14/14.
//  Copyright (c) 2014 Dabus.Tv. All rights reserved.
//

import UIKit
import Foundation
import AVFoundation

class ViewController: UIViewController {
    @IBOutlet weak var strFiles: UITextView!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        if let url = NSURL(string: "http://www.anyurl.com/") {
            if let loadedString = String(contentsOfURL: url) {
                // file string was sucessfully loaded
                // add the file path + / + filename + extension
                let localUrl = (NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String) + "/" + "data" + ".db"  // Documents URL as String (local storage path)
                // check local file path url
                if let checkLocalUrl = NSURL(fileURLWithPath: localUrl) {
                    let savedFile = loadedString.writeToURL(checkLocalUrl, atomically: true, encoding: NSUTF8StringEncoding, error: nil) // write to url savedFile will true or false
                    if savedFile {
                        // do whatever
                        self.strFiles.text = "\(self.strFiles.text)path: \(checkLocalUrl)\n"
                        self.strFiles.text = "\(self.strFiles.text)file was sucessfully saved\n"
                    }

                    // lets create an ARRAY with your string
                    var arrayLines = ""
                    if let myArrayParsed = loadedString.JSONParseArray() {
                        for elem:AnyObject in myArrayParsed {
                            let name = elem["name"] as String
                            let path = elem["path"] as String
                            arrayLines = "Name: \(name), Path: \(path)"

                            self.strFiles.text = "\(self.strFiles.text)\(arrayLines)\n"
                        }
                    } else {
                        // could not parse array

                    }

                } else {
                    // could not check local url
                }
            } else {
                // could not load string contents from url
            }
        } else {
            // invalid url
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}
extension String {
    func JSONParseArray() -> [AnyObject]? {
        if let data = self.dataUsingEncoding(NSUTF8StringEncoding) {
            if let array = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions(0), error: nil)  as? [AnyObject] {
                return array
            }
        } else {
            return nil
        }
        return [AnyObject]()
    }
}