xcode 使用 URL 的简单 Swift 文件下载
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Simple Swift file download with URL
提问by Gio
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.
因此，我将 URL 作为字符串（在本例中为 JPG，但如果可能的话，希望任何文件类型的一般程序），并且我将文件路径作为字符串，我想在其中保存文件。
What would be the fastest way to get this implemented?
实现这一目标的最快方法是什么？
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!
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，主要是使用 UIImage 但我得到错误：“使用未解析的标识符”，添加“导入 UIKit”得到我的错误：“没有这样的模块”。请帮忙！
import Foundation
let myURLstring = "http://www.safety.vanderbilt.edu/images/staff/Bob-Wheaton.jpg"
let myFilePathString = "/Volumes/HD/Staff Pictures/Bob-VEHS.jpg"
---> ABOVE IS THE ORIGINAL QUESTION <---
---> 以上是原始问题 <---
---> BELOW IS NEW IMPROVED CODE: WORKING <---
---> 下面是新的改进代码： 工作 <---
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)
采纳答案by Nate Cook
If you're writing for OS X, you'll use NSImageinstead of UIImage. You'll need import Cocoafor that - UIKit is for iOS, Cocoa is for the Mac.
如果你正在编写OS X，你将使用NSImage替代UIImage。你需import Cocoa要这样做 - UIKit 适用于 iOS，Cocoa 适用于 Mac。
NSDatahas an initializer that takes a NSURL, and another that takes a file path, so you can load the data either way.
NSData有一个带 的初始化程序，NSURL另一个带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。
if let url = NSURL(string: myURLstring) {
let imageDataFromURL = NSData(contentsOfURL: url)
}
let imageDataFromFile = NSData(contentsOfFile: myFilePathString)
回答by OlivierM
With Swift 4, the code will be:
使用Swift 4，代码将是：
if let url = URL(string: myURLstring) {
let imageDataFromURL = try Data(contentsOf: url)
}
