Touch a file - update it's modified time stamp

Question

Is there an efficient way to update the last modified property of a file on the iPad's filesystem i.e. the unix touch command?

I've had a look at NSFileManager but no luck.

Answer 1

OK, so I'm answering my question just after I've asked it :(

I've found the method setAttributes:ofItemAtPath:error: in the NSFileManager class and I can specify the modified timestamp there.

Thanks anyway!

Answer 2

To update the modification timestamp (which is, for example, shown in the output of ls -l) of filePath to now:

NSError* error;
NSFileManager* fileManager = [NSFileManager defaultManager];

if (![fileManager setAttributes:@{NSFileModificationDate:[NSDate date]}
                   ofItemAtPath:filePath
                          error:&error]) {
    NSLog(@"Couldn't update modification date: %@", error);
}