带有URL的简单Swift文件下载

问题描述

因此，我将URL作为字符串(在本例中为JPG，但如果可能的话，想要任何文件类型的通用步骤)，并且我将文件路径作为字符串，用于保存文件.

So I have the URL as string (in this case a JPG but would like a general procedure for any file type if possible) and I have the file path as string where I want to save the file.

实现此目标最快的方法是什么?

What would be the fastest way to get this implemented?

请记住，这是针对OSX命令行应用程序的.我尝试了一些在这里找到的示例代码，主要使用UIImage，但出现错误:使用未解决的标识符"，添加导入UIKit"会得到错误:无此类模块".请帮忙！

Please keep in mind this is for OSX command line application. I tried few sample codes found here, mostly using UIImage but I get error:"Use of unresolved identifier", adding "import UIKit" gets me error:"No such Module". Please help!

import Foundation

let myURLstring = "http://www.safety.vanderbilt.edu/images/staff/Bob-Wheaton.jpg"
let myFilePathString = "/Volumes/HD/Staff Pictures/Bob-VEHS.jpg"

--->以上是原始问题< ---

---> ABOVE IS THE ORIGINAL QUESTION <---

--->下面是新的改进代码:工作< ---

---> BELOW IS NEW IMPROVED CODE: WORKING <---

import Foundation

let myURLstring = "http://www.safety.vanderbilt.edu/images/staff/Bob-Wheaton.jpg"
let myFilePathString = "/Volumes/HD/Staff Pictures/Bob-VEHS.jpg"

let url = NSURL(string: myURLstring)
let imageDataFromURL = NSData(contentsOfURL: url)

let fileManager = NSFileManager.defaultManager()
fileManager.createFileAtPath(myFilePathString, contents: imageDataFromURL, attributes: nil)

推荐答案

如果要为OS X编写，则将使用 NSImage 而不是 UIImage .为此，您需要 import Cocoa -UIKit适用于iOS，Cocoa适用于Mac.

If you're writing for OS X, you'll use NSImage instead of UIImage. You'll need import Cocoa for that - UIKit is for iOS, Cocoa is for the Mac.

NSData 有一个使用 NSURL 的初始化程序，以及一个使用文件路径的初始化程序，因此您可以以任何一种方式加载数据.

NSData has an initializer that takes a NSURL, and another that takes a file path, so you can load the data either way.

if let url = NSURL(string: myURLstring) {
    let imageDataFromURL = NSData(contentsOfURL: url)
}

let imageDataFromFile = NSData(contentsOfFile: myFilePathString)

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