xcode 如何删除我的应用程序文档目录中的文件？
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How do I delete a file in my apps documents directory?
提问by RexOnRoids
Given, a file of path [[self documentsDirectory] stringByAppendingPathComponent:@"myFiles/aFile.txt"], How do I delete a file in my apps documents directory?
给定路径文件[[self documentsDirectory] stringByAppendingPathComponent:@"myFiles/aFile.txt"]，如何删除我的应用程序文档目录中的文件？
回答by Ben Gottlieb
NSFileManager is a very handy tool:
NSFileManager 是一个非常方便的工具：
[[NSFileManager defaultManager] removeItemAtPath: pathToFile error: &error];
回答by Imanou Petit
With Swift 3, FileManagerhas a method called removeItem(at:). removeItem(at:)has the following declaration:
在 Swift 3 中，FileManager有一个名为removeItem(at:). removeItem(at:)有以下声明：
func removeItem(at URL: URL) throws
Removes the file or directory at the specified URL.
删除指定 URL 处的文件或目录。
The code fragment below shows how to delete a file using removeItem(at:):
下面的代码片段显示了如何使用 删除文件removeItem(at:)：
do {
try FileManager.default.removeItem(at: fileUrl)
} catch {
print("Could not delete file: \(error)")
}
As a complete example, the following UIViewControllersubclass implementation shows how to copy a file from the app bundle to a specific url in the document directory, delete a file at a specific url in document directory and check if a file exists at a specific url in document directory:
作为一个完整的例子，下面的UIViewController子类实现展示了如何将一个文件从 app bundle 复制到文档目录中的特定 url，删除文档目录中特定 url 处的文件，并检查文档中特定 url 处是否存在文件目录：
import UIKit
class ViewController: UIViewController {
@IBAction func copyFile(_ sender: UIButton) {
// Get app bundle file url
guard let bundleFileUrl = Bundle.main.url(forResource: "Movie", withExtension: "mov") else { return }
// Create a destination url in document directory for file
guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
let documentDirectoryFileUrl = documentsDirectory.appendingPathComponent("Movie.mov")
// Copy bundle file to document directory
if !FileManager.default.fileExists(atPath: documentDirectoryFileUrl.path) {
do {
try FileManager.default.copyItem(at: bundleFileUrl, to: documentDirectoryFileUrl)
} catch {
print("Could not copy file: \(error)")
}
}
}
@IBAction func deleteFile(_ sender: UIButton) {
// Get destination url in document directory for file
guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
let documentDirectoryFileUrl = documentsDirectory.appendingPathComponent("Movie.mov")
// Delete file in document directory
if FileManager.default.fileExists(atPath: documentDirectoryFileUrl.path) {
do {
try FileManager.default.removeItem(at: documentDirectoryFileUrl)
} catch {
print("Could not delete file: \(error)")
}
}
}
@IBAction func checkIfFileExist(_ sender: UIButton) {
// Get destination url in document directory for file
guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
let outputUrl = documentsDirectory.appendingPathComponent("Movie.mov")
// Print if file exists in document directory or not
FileManager.default.fileExists(atPath: outputUrl.path) ? print("File exists") : print("File does not exist")
}
}
回答by Abdul Karim
For Swift 3.x and Xcode 8.x
对于 Swift 3.x 和 Xcode 8.x
func removeItemForDocument(itemName:String, fileExtension: String) {
let fileManager = FileManager.default
let NSDocumentDirectory = FileManager.SearchPathDirectory.documentDirectory
let NSUserDomainMask = FileManager.SearchPathDomainMask.userDomainMask
let paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true)
guard let dirPath = paths.first else {
return
}
let filePath = "\(dirPath)/\(itemName).\(fileExtension)"
do {
try fileManager.removeItem(atPath: filePath)
} catch let error as NSError {
print(error.debugDescription)
}}
func removeItemForDocument(itemName:String, fileExtension: String) {
let fileManager = FileManager.default
let NSDocumentDirectory = FileManager.SearchPathDirectory.documentDirectory
let NSUserDomainMask = FileManager.SearchPathDomainMask.userDomainMask
let paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true)
guard let dirPath = paths.first else {
return
}
let filePath = "\(dirPath)/\(itemName).\(fileExtension)"
do {
try fileManager.removeItem(atPath: filePath)
} catch let error as NSError {
print(error.debugDescription)
}}
