Design

1. Design a NSNotificationCenter API that accepts blocks
2. Implementing a notification center**
3. Displayed searched images using tableview or collectionview
4. Implement async task dispatcher with ability to cancel tasks, using GCD internally.
5. Create an app that loads images from Flikcr an displays them on a collection with a searchbar. 1 hour discuss the code you wrote with some vague and unclear questions
6. Make basic UITableView, implement json-to-object mapping, table delegate and datasource, with async image load
7. Implement a stack with thread safety
8. What considerations do you need when writing a UITableViewController which shows images downloaded from a remote server?