将图像文件保存到临时目录 [英] Save image file to temp directory

问题描述

我有一个名为Image.png的图像文件，它保存在我的主包中（位于Project Navigator层次结构中的ViewController.swift文件旁边）。我想将此映像的副本保存到临时目录。我以前从来没有这样做过，我可以使用哪些代码？

I have an image file named "Image.png", and it is saved in my main bundle (right beside the ViewController.swift file in the Project Navigator hierarchy). I want to save a copy of this image to the temporary directory. I've never done it before, what code could I use please?

推荐答案

这样的事情可以解决问题。我假设你想要在Swift中得到答案。

Something like this should do the trick. I'm assuming you wanted the answer in Swift.

 /**
 * Copy a resource from the bundle to the temp directory.
 * Returns either NSURL of location in temp directory, or nil upon failure.
 *
 * Example: copyBundleResourceToTemporaryDirectory("kittens", "jpg")
 */
public func copyBundleResourceToTemporaryDirectory(resourceName: String, fileExtension: String) -> NSURL?
{
    // Get the file path in the bundle
    if let bundleURL = NSBundle.mainBundle().URLForResource(resourceName, withExtension: fileExtension) {

        let tempDirectoryURL = NSURL.fileURLWithPath(NSTemporaryDirectory(), isDirectory: true)

        // Create a destination URL.
        let targetURL = tempDirectoryURL.URLByAppendingPathComponent("\(resourceName).\(fileExtension)")

        // Copy the file.
        do {
            try NSFileManager.defaultManager().copyItemAtURL(bundleURL, toURL: targetURL)
            return targetURL
        } catch let error {
            NSLog("Unable to copy file: \(error)")
        }
    }

    return nil
}

虽然，我不确定你为什么要这样做而不是直接访问捆绑资源。

Although, I'm not really sure why you would want to do this rather than directly accessing the bundle resource.

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