Get last file modification date of application data files?

Question

I have a plist file in my application data that i want to update from a webserver every 24 hours. Is there a way to check when the file is last modified or should i, in some way register the date and time when i update the file, and use that to compare to?

if (lastMod > currentDate){
    [arrayFromXml writeToFile:path atomically:YES];
}

Answer 1

You can use NSFileManager for this:

NSDictionary *attributes = [[NSFileManager defaultManager] attributesOfItemAtPath:@"path/to/my/file" error:nil];

NSDate *date = [attributes fileModificationDate];

// compare 'date'
// date > now
if ([date compareTo:[NSDate date]] == 1) 
{
    [arrayFromXML writeToFile:@"path/to/my/file" atomically:YES];
}