This document discusses different ways to pass data between views in a parent-child view hierarchy. It proposes using an "INDEXIDENTIFIER" to identify the correct child view that needs to receive data from the parent view. When the parent view detects missing data, it can notify the correctly indexed child view via notifications or delegates to trigger missing data animations. The challenges are how to dynamically link the parent and child views as the views can change, and how to ensure the right child view receives the data.

1. INDEXIDENTIFIER
A NEW WAY TO PASS DATA
allenlinli 2017.9.20

3. • - SearchRouteViewController
• - SearchCollectionTableViewCell
• - SingleSearchCollectionViewCell (or
MultiSearchCollectionViewCell)
• - SearchRouteAirportView
• - SearchRouteDateView

4. NOTIFY PROCESS
• 流程
• - ParentViewController press search button
• - ParentViewController find the first missing data from memory( or
DB)
• - ParentViewController notify view (or viewModel) of the first
missing data to show `missing animation`

5. MANY WAYS TO PASS DATA(ACTION)
• Question:
• - How to pass data (action) from ParentViewController to the first
view? It's hard to find the first view
• - 1. Keep subViewModels. Cons: view are dynamic, we need to
update subViewModels often
• - 2. Use delegate to chain viewModels. Cons: many delegates
• - 3. RxSwfit? Bind viewModel and subViewModel. Cons: similar to 1.
• - 4. notification: How to find post to correct view? Or let the
correct view receive?

7. DONEC QUIS NUNC

9. THE REAL QUESTION
Q: HOW TO FIND THE CORRECT VIEW
A: BY INDEXIDENTIFIER
allenlinli 2017.9.20