iOS：如何找到文件的创建日期？ [英] iOS: How do you find the creation date of a file?

问题描述

我正在尝试查找文件的创建日期（NOT修改日期）。

I'm trying to find the creation date (NOT modification date) of a file.

创建日期似乎不在文件的属性中虽然修改日期是。

Creation date doesn't appear to be in the attributes of a file, though modified date is.

我正在使用此代码..

I'm using this code..

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;
}

总是返回nil。在调试器中键入po attrs以获取NSDictionary中的键/值对列表，返回以下内容。

This always returns nil. Typing 'po attrs' into the debugger to get the list of key/value pairs in the NSDictionary returns the following..

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;

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;

没有创建日期.. bah ..

No creation date.. bah..

任何人都知道获得创建日期的另一种方式，还是仅在iOS中不存在？

Anyone know another way of getting the creation date or does it just not exist in iOS?

推荐答案

这段代码实际上是给我很好的创建日期：

This code actually returns the good creation date to me:

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中创建文件？也许这就是问题所在。

Are you creating the file inside the App? Maybe that's where the problem is.

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