Loading trie first time the app opens

Question

I am working on a custom ios keyboard. For the dictionary of words, I have implemented trie for autocorrect. Trie is coded in objective c as well. I have 100k wordlist. I want to load the trie only the first time the app opens and it should get stored permanently. Is it possible?

Answer 1

What do you mean with loading only once, downloading?

Given that you download the data (let's assume as a txt from the internet) you can build up your trie and serialize that via NSKeyedArchiver and also restore it.

Trie *wordsTrie = [[Trie alloc]initWithUrl:@"https://www.internet.com/words.txt"]];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:wordsTrie];

/* persist the data ... */

Trie *restoredWordsTrie = [NSKeyedUnarchiver unarchiveObjectWithData:data];

More about archiving objects can be found here: https://developer.apple.com/library/content/documentation/General/Conceptual/DevPedia-CocoaCore/Archiving.html