使用Swift删除iOS目录中的文件

我在我的应用程序中下载了一些PDF文件，并希望在closures应用程序时删除这些文件。

由于某种原因，它不起作用：

创build文件：

let reference = "test.pdf" let RequestURL = "http://xx/_PROJEKTE/xx\(self.reference)" let ChartURL = NSURL(string: RequestURL) //download file let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first! as NSURL let destinationUrl = documentsUrl.URLByAppendingPathComponent(ChartURL!.lastPathComponent!) if NSFileManager().fileExistsAtPath(destinationUrl.path!) { print("The file already exists at path") } else { // if the file doesn't exist // just download the data from your url if let ChartDataFromUrl = NSData(contentsOfURL: ChartURL!){ // after downloading your data you need to save it to your destination url if ChartDataFromUrl.writeToURL(destinationUrl, atomically: true) { print("file saved") print(destinationUrl) } else { print("error saving file") } } } 

然后我想调用test()函数来删除这些项目，如下所示：

 func test(){ let fileManager = NSFileManager.defaultManager() let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first! as NSURL do { let filePaths = try fileManager.contentsOfDirectoryAtPath("\(documentsUrl)") for filePath in filePaths { try fileManager.removeItemAtPath(NSTemporaryDirectory() + filePath) } } catch { print("Could not clear temp folder: \(error)") } } 

Answer 1

我相信你的问题在这一行：

 let filePaths = try fileManager.contentsOfDirectoryAtPath("\(documentsUrl)") 

你正在使用contentsOfDirectoryAtPath()和NSURL 。 您selectpathstring或URL，而不是尝试将它们混合。 要预先清空您可能的下一个问题，首选url。 尝试使用contentsOfDirectoryAtURL()和removeItemAtURL() 。

另一个好奇的事情，你应该看看，一旦你解决上述问题：当你尝试删除时，为什么你使用NSTemporaryDirectory()作为文件path？ 你正在阅读文档目录，应该使用它。

Answer 2

这段代码适用于我。 我删除了所有caching的图像。

 private func test(){ let fileManager = NSFileManager.defaultManager() let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.CachesDirectory, inDomains: .UserDomainMask).first! as NSURL let documentsPath = documentsUrl.path do { if let documentPath = documentsPath { let fileNames = try fileManager.contentsOfDirectoryAtPath("\(documentPath)") print("all files in cache: \(fileNames)") for fileName in fileNames { if (fileName.hasSuffix(".png")) { let filePathName = "\(documentPath)/\(fileName)" try fileManager.removeItemAtPath(filePathName) } } let files = try fileManager.contentsOfDirectoryAtPath("\(documentPath)") print("all files in cache after deleting images: \(files)") } } catch { print("Could not clear temp folder: \(error)") } } 

****更新迅速3 ****

  let fileManager = FileManager.default let documentsUrl = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first! as NSURL let documentsPath = documentsUrl.path do { if let documentPath = documentsPath { let fileNames = try fileManager.contentsOfDirectory(atPath: "\(documentPath)") print("all files in cache: \(fileNames)") for fileName in fileNames { if (fileName.hasSuffix(".png")) { let filePathName = "\(documentPath)/\(fileName)" try fileManager.removeItem(atPath: filePathName) } } let files = try fileManager.contentsOfDirectory(atPath: "\(documentPath)") print("all files in cache after deleting images: \(files)") } } catch { print("Could not clear temp folder: \(error)") }