Question

我正在尝试查找文件的创建日期（不是修改日期）。

虽然修改日期为。

，但创建日期似乎不在文件的属性中

我正在使用此代码..

NSFileManager* fm = [NSFileManager defaultManager];

NSString* path = [PathHelpers pathInDocumentsFolderWithFilename:FILE_NAME];
NSDictionary* attrs = [fm attributesOfItemAtPath:path error:nil];

if (attrs != nil) {
    return (NSDate*)[attrs objectForKey: NSFileCreationDate];
} else {
    return nil;
}

这总是返回nil。在调试器中输入'po attrs'以获取NSDictionary中的键/值对列表将返回以下内容。

NSFileGroupOwnerAccountID = 20;
  NSFileGroupOwnerAccountName = staff;
  NSFileModificationDate = 2010-01-21 11:47:55 +0000;
  NSFileOwnerAccountID = 501;
  NSFileOwnerAccountName = ben;
  NSFilePosixPermissions = 420;
  NSFileReferenceCount = 1;
  NSFileSize = 338;
  NSFileSystemFileNumber = 2234;
  NSFileSystemNumber = 42553324;
  NSFileType = NSFileTypeRegular;

没有创作日期.. bah ..

任何人都知道另一种获取创建日期的方式，还是知道它在iOS中不存在？

Answer 1

此代码实际上向我返回了良好的创建日期：

NSFileManager* fm = [NSFileManager defaultManager];
NSDictionary* attrs = [fm attributesOfItemAtPath:path error:nil];

if (attrs != nil) {
    NSDate *date = (NSDate*)[attrs objectForKey: NSFileCreationDate];
    NSLog(@"Date Created: %@", [date description]);
} 
else {
    NSLog(@"Not found");
}

您是否在App中创建了文件？也许这就是问题所在。

Answer 2

fileCreationDate中有一条特殊消息NSDictionary。以下适用于我：

<强>目标-C：

NSDate *date = [attrs fileCreationDate];

<强>夫特：

let attrs = try NSFileManager.defaultManager().attributesOfItemAtPath(path) as NSDictionary
attrs.fileCreationDate()

Answer 3

Swift 2.0版本：

do {
    let fileAttributes = try NSFileManager.defaultManager().attributesOfItemAtPath(YOURPATH)
    let creationDate = fileAttributes[NSFileCreationDate] as? NSDate
    let modificationDate = fileAttributes[NSFileModificationDate] as? NSDate
    print("creation date of file is", creationDate)
    print("modification date of file is", modificationDate)
}catch let error as NSError {
    print("file not found:", error)
}

Answer 4

在Swift 4中，如果你想知道DocumentsDirectory中特定文件的文件创建日期，你可以使用这个方法

func getfileCreatedDate(theFile: String) -> Date {

        var theCreationDate = Date()
        do{
            let aFileAttributes = try FileManager.default.attributesOfItem(atPath: theFile) as [FileAttributeKey:Any]
            theCreationDate = aFileAttributes[FileAttributeKey.creationDate] as! Date

        } catch let theError as Error{
            print("file not found \(theError)")
        }
        return theCreationDate
    }

Answer 5

  NSDate *creationDate = nil;
  if ([fileManager fileExistsAtPath:filePath]) {
       NSDictionary *attributes = [fileManager attributesOfItemAtPath:filePath error:nil];
       creationDate = attributes[NSFileCreationDate];
  }

其here

Answer 6

Swift 3版本代码：

do {
        let fileAttributes = try FileManager.default.attributesOfItem(atPath: yourPathString)
        let modificationDate = fileAttributes[FileAttributeKey.modificationDate] as! Date
        print("Modification date: ", modificationDate)
    } catch let error {
        print("Error getting file modification attribute date: \(error.localizedDescription)")
    }

Answer 7

您可以使用fstat64获取返回结构的st_birthtimespec成员吗？您需要为该文件创建一个C文件句柄，并将timespec值转换为NSDate，但这比没有好。

Answer 8

Updated answer for Swift 4 to pull out the modified (.modifiedDate) or creation (.creationDate) date:

let file: URL = ...
if let attributes = try? FileManager.default.attributesOfItem(atPath: file.path) as [FileAttributeKey: Any],
    let creationDate = attributes[FileAttributeKey.creationDate] as? Date {
    print(creationDate)
    }

Using a file that you provide in advance via a URL, it will request its attributes. If successful a dictionary of [FileAttributeKey: Any] is returned
Using the dictionary from step 1, it then pulls out the creation date (or modified if you prefer) and using the conditional unwrap, assigns it to a date if successful
Assuming the first two steps are successful, you now have a date that you can work with

Answer 9

在Swift 5中：

let date = (try? FileManager.default.attributesOfItem(atPath: path))?[.creationDate] as? Date

iOS：如何找到文件的创建日期？

9 个答案: