ios - 将图像文件保存到临时目录

Question

我有一个名为“Image.png”的图像文件，它保存在我的主包中（就在 Project Navigator 层次结构中的 ViewController.swift 文件旁边）。我想将此图像的副本保存到临时目录。我以前从来没有做过，请问我可以使用什么代码？

Answer 1

像这样的东西应该可以解决问题。我假设您想要 Swift 中的答案。

 /**
 * 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，我不确定您为什么要这样做而不是直接访问捆绑资源。

Answer 2

Swift 4.x版本的 mszaro 的回答

/**
 * 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 = Bundle.main.url(forResource: resourceName, withExtension: fileExtension) {

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

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

        // Copy the file.
        do {
            try FileManager.default.copyItem(at: bundleURL, to: targetURL)
            return targetURL as NSURL
        } catch let error {
            NSLog("Unable to copy file: \(error)")
        }
    }

    return nil
}

Answer 3

这是Swift 5中的答案

/**
 * Copy a resource from the bundle to the temp directory.

 * Returns either URL of location in temp directory, or nil upon failure.
 *
 * Example: copyBundleResourceToTemporaryDirectory("kittens", "jpg")
 */

public func copyBundleResourceToTemporaryDirectory(resourceName: String, fileExtension: String) -> URL?
    {
        // Get the file path in the bundle
        if let bundleURL = Bundle.main.url(forResource: resourceName, withExtension: fileExtension) {

            let tempDirectoryURL = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)

            // Create a destination URL.
            let targetURL = tempDirectoryURL.appendingPathComponent(resourceName).appendingPathExtension(fileExtension)

            // Copy the file.
            do {
                try FileManager.default.copyItem(at: bundleURL, to: targetURL)
                return targetURL
            } catch let error {
                print("Unable to copy file: \(error)")
            }
        }

        return nil
    }

我建议阅读这篇文章以了解有关临时文件的更多信息