无法获取FileCreationDate？ [英] Can't get FileCreationDate?

问题描述

在我的应用程序中，我创建一个目录，然后下面的代码工作：

In my app, I create a directory, and then the following code works:

NSDictionary *fileAttributes = [fileManager fileAttributesAtPath:trackDirectory traverseLink:YES];
NSDate *fileDate = [fileAttributes objectForKey:NSFileModificationDate];

但是，当我尝试获取NSFileCreationDate时，它不工作。

However, when I try and get the NSFileCreationDate instead, it doesn't work.

我做错了什么？

推荐答案

可以看到，iPhoneOS上没有其他日期。这里是整个 attributesOfItemAtPath：看起来像：

As far as I can see, there is no other date on iPhoneOS. Here is what the whole attributesOfItemAtPath: looks like:

{
    NSFileGroupOwnerAccountID = 20;
    NSFileGroupOwnerAccountName = staff;
    NSFileModificationDate = 2009-12-03 21:34:59 -0800;
    NSFileOwnerAccountID = 501;
    NSFileOwnerAccountName = username;
    NSFilePosixPermissions = 420;
    NSFileReferenceCount = 1;
    NSFileSize = 8703;
    NSFileSystemFileNumber = 14066295;
    NSFileSystemNumber = 234881026;
    NSFileType = NSFileTypeRegular;
}

所以，你的答案是..你试图访问字典键这在iPhoneOS上不存在。

So, your answer is.. you're trying to access a dictionary key that is not present on iPhoneOS.

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