Question

我想从我的应用文档目录中删除图片。我写的删除图片的代码是：

 -(void)removeImage:(NSString *)fileName
{
    fileManager = [NSFileManager defaultManager];
    paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    documentsPath = [paths objectAtIndex:0];
    filePath = [documentsPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", fileName]];
    [fileManager removeItemAtPath:filePath error:NULL];
    UIAlertView *removeSuccessFulAlert=[[UIAlertView alloc]initWithTitle:@"Congratulation:" message:@"Successfully removed" delegate:self cancelButtonTitle:@"Close" otherButtonTitles:nil];
    [removeSuccessFulAlert show];
}

部分工作。此代码从目录中删除文件，但是当我检查目录中的内容时，它仍然在那里显示图像名称。我想从目录中完全删除该文件。我应该在代码中更改什么来做同样的事情？感谢

Answer 1

我检查了你的代码。它对我有用。使用下面的修改代码检查您获得的任何错误

- (void)removeImage:(NSString *)filename
{
  NSFileManager *fileManager = [NSFileManager defaultManager];
  NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];

  NSString *filePath = [documentsPath stringByAppendingPathComponent:filename];
  NSError *error;
  BOOL success = [fileManager removeItemAtPath:filePath error:&error];
  if (success) {
      UIAlertView *removedSuccessFullyAlert = [[UIAlertView alloc] initWithTitle:@"Congratulations:" message:@"Successfully removed" delegate:self cancelButtonTitle:@"Close" otherButtonTitles:nil];
      [removedSuccessFullyAlert show];
  }
  else
  {
      NSLog(@"Could not delete file -:%@ ",[error localizedDescription]);
  }
}

Answer 2

Swift 3.0：

func removeImage(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)
  }}

感谢@Anil Varghese，我在swift 2.0中编写了非常类似的代码：

static func removeImage(itemName:String, fileExtension: String) {
  let fileManager = NSFileManager.defaultManager()
  let nsDocumentDirectory = NSSearchPathDirectory.DocumentDirectory
  let nsUserDomainMask = NSSearchPathDomainMask.UserDomainMask
  let paths = NSSearchPathForDirectoriesInDomains(nsDocumentDirectory, nsUserDomainMask, true)
  guard let dirPath = paths.first else {
    return
  }
  let filePath = "\(dirPath)/\(itemName).\(fileExtension)"
  do {
    try fileManager.removeItemAtPath(filePath)
  } catch let error as NSError {
    print(error.debugDescription)
  }
}

Answer 3

Swift 2.0：

func removeOldFileIfExist() {
    let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
    if paths.count > 0 {
        let dirPath = paths[0]
        let fileName = "someFileName"
        let filePath = NSString(format:"%@/%@.png", dirPath, fileName) as String
        if NSFileManager.defaultManager().fileExistsAtPath(filePath) {
            do {
                try NSFileManager.defaultManager().removeItemAtPath(filePath)
                print("old image has been removed")
            } catch {
                print("an error during a removing")
            }
        }
    }
}

Answer 4

不要将错误设置为NULL，而是将其设置为

NSError *error;
[fileManager removeItemAtPath:filePath error:&error];
if (error){
NSLog(@"%@", error);
}

这将告诉您它是否实际删除了文件

Answer 5

在Swift中3＆4都

 func removeImageLocalPath(localPathName:String) {
            let filemanager = FileManager.default
            let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory,.userDomainMask,true)[0] as NSString
            let destinationPath = documentsPath.appendingPathComponent(localPathName)
 do {
        try filemanager.removeItem(atPath: destinationPath)
        print("Local path removed successfully")
    } catch let error as NSError {
        print("------Error",error.debugDescription)
    }
    }

Answer 6

我想从文档目录中删除我的sqlite数据库。我通过以下答案成功删除了sqlite数据库

NSString *strFileName = @"sqlite";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

NSArray *contents = [fileManager contentsOfDirectoryAtPath:documentsDirectory error:NULL];
NSEnumerator *enumerator = [contents objectEnumerator];
NSString *filename;
while ((filename = [enumerator nextObject])) {
    NSLog(@"The file name is - %@",[filename pathExtension]);
    if ([[filename pathExtension] isEqualToString:strFileName]) {
       [fileManager removeItemAtPath:[documentsDirectory stringByAppendingPathComponent:filename] error:NULL];
        NSLog(@"The sqlite is deleted successfully");
    }
}

Answer 7

    NSError *error;
    [[NSFileManager defaultManager] removeItemAtPath:new_file_path_str error:&error];
    if (error){
        NSLog(@"%@", error);
    }

Answer 8

您可以使用NSFileManager.defaultManager（）双重保护文件删除.isDeletableFileAtPath（PathName）到目前为止，您必须使用do {} catch {}，因为旧的错误方法不再有效。 isDeletableFileAtPath（）不是＆＃34;抛出＆＃34; （即＆＃34; public func removeItemAtPath（path：String）throws＆＃34;）所以它不需要do ... catch

let killFile = NSFileManager.defaultManager()

            if (killFile.isDeletableFileAtPath(PathName)){


                do {
                  try killFile.removeItemAtPath(arrayDictionaryFilePath)
                }
                catch let error as NSError {
                    error.description
                }
            }

Answer 9

如果您对现代api方式感兴趣，避免在文档目录中使用NSSearchPath和过滤文件，在删除之前，您可以这样做：

let fileManager = FileManager.default
let keys: [URLResourceKey] = [.nameKey, .isDirectoryKey]
let options: FileManager.DirectoryEnumerationOptions = [.skipsHiddenFiles, .skipsPackageDescendants]
guard let documentsUrl = fileManager.urls(for: .documentDirectory, in: .userDomainMask).last,
      let fileEnumerator = fileManager.enumerator(at: documentsUrl,
                                                  includingPropertiesForKeys: keys,
                                                  options: options) else { return }

let urls: [URL] = fileEnumerator.flatMap { $0 as? URL }
                                .filter { $0.pathExtension == "exe" }
for url in urls {
   do {
      try fileManager.removeItem(at: url)
   } catch {
      assertionFailure("\(error)")
   }
}

Answer 10

FreeGor版本转换为Swift 3.0

 func removeOldFileIfExist() {
    let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
    if paths.count > 0 {
        let dirPath = paths[0]
        let fileName = "filename.jpg"
        let filePath = NSString(format:"%@/%@", dirPath, fileName) as String
        if FileManager.default.fileExists(atPath: filePath) {
            do {
                try FileManager.default.removeItem(atPath: filePath)
                print("User photo has been removed")
            } catch {
                print("an error during a removing")
            }
        }
    }
}

从文档目录中删除指定的文件

10 个答案: