No scrolling - When using a scrollview in Bottom controller in your sample project.

[prashantAlgante]

When using Scrollview instead of table view in bottom view controller then scrolling is not happening properly in Container scroll view.

Point 2 - also the content size of bottom screen is not getting calculated correct in your Container class when using above case.

See image . Red portion is scroll view inside every tab.

[OfTheWolf]

If you set content size of the bottom scroll view it must work. Table view updates its content size as you scroll but scroll view does'nt.