Firebase has build in system in Objective-C as well, but the syntax is a touch different.
Firebase * ref;
Firebase * autoId = [ref childByAutoId];
This:
Firebase* f = [[Firebase alloc] initWithUrl:@"https://test.firebaseio.com/items"];
[f setValue:@{@"UNIQUE OBJECT ID HERE": @{@"meh": @"lol", @"hum": @"kek"}}];
Should be:
Firebase* f = [[Firebase alloc] initWithUrl:@"https://test.firebaseio.com/items"];
[[f childByAutoId] setValue:@{@"meh": @"lol", @"hum": @"kek"}}];