Check if file is updated

Question

I have iOS application. There some files in the documents directory. I need to check if these files were edited or replaced. What is the proper way to do it? Shall i some hash of the file or last edited time(how to get this time in iOS) or there is some better way to implement this?

Answer 1

you can use this code to get the file modification date:

NSFileManager* fileManager = [NSFileManager defaultManager];
NSDictionary* attributes = [fileManager attributesOfItemAtPath:path error:nil];

if (attributes != nil) {
    NSDate *date = (NSDate*)[attributes objectForKey:NSFileModificationDate];
    NSLog(@"Last modification date: %@", [date description]);
} else {
    NSLog(@"Not found");
}

here you can find the documentation of the attributesOfItemAtPath:error: function, and here the list of file properties you can get