cell-layout | custom manager | Grid library

I’m building something like a todo app where I have EXPANDABLE “slave” UITableView inside “master” UITableViewCell (reason is “material design of expandable “slave” table). Maybe is also relevant that this is all inside a container UIView inside UIScrollView embed in NavigationViewController and TabViewController. Pretty complex... Let me explain:

• “Master” UITableViewControler with 2 section (this year/long term) with custom headers and custom TableViewCell

• Custom TableViewCell has a UIView and “slave” UITableView inside - underlying UIView is constrained to “slave” UITableView and makes it’s “material” design with shadow (cropToBounds prevents shadow on UITableView)

• “Slave” UITableView should be with only one expanding section (I followed logic of this guy: https://www.youtube.com/watch?v=ClrSpJ3txAs) – tap on first row hides/show subviews and footer

• “Slave” UITableView has 3 custom TableViewCell (“header” populated always at first row, “subtask” starting on second and populated based on number of subtasks, “footer” always the last)

Picture of so far ugly UI might make it more clear:

Interface Builder setup

UI design

I am trying to use Interface Builder as much as possible (for me as a beginner it saves a lot of code and makes things more clear).

Code wise it is a bit complex architecture since I have a “Goal” realm object that has every time a list of “Subtask” objects. So the “master” UITableViewController dataSource grabs a goal and pass it to “master’s” TableViewCell (GoalMainCell) cell.goal = goals?[indexPath.row] that is dataSource and Delegate for its outlet “slave” UITableView. This way I can populate “slave” UITableView with its correct subtasks from realm.

When I tried to have “master” UITableViewController a dataSource & delegate of both tables I wasn’t able to populate subtasks properly (even setting tableView.tag for each and bunch of if…else statements – indexPath.row can’t be taken as a goal's index since it starts from 0 for each “slave” tableView.row)

class GoalsTableViewController: UITableViewController: (master tableviewcontroller)