Question

I use plist to save data as shown below. I need now to delete this data, either all of them or certain record – message in my case – from the plist file , how to do that?

NSMutableData* data = [[NSMutableData alloc] init];
    NSKeyedArchiver* archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
    [archiver encodeObject:self.messages forKey:@"Messages"];
    [archiver finishEncoding];
    [data writeToFile:[self messagesPath] atomically:YES];

Answer 1

You can just unarchive the same way using an NSKeyedUnarchiver to get your original data back. Then, assuming it is a NSDictionary and you make a mutable copy of it, you can remove keys from it just as normal.