scroll within subview issue

## Expected Behavior

i have a view. about 3/4 below, i added a subview. the subview has a spreadsheet view on it. i would like for it to scroll.

## Actual Behavior

does not scroll vertically

it scrolls horizontally if i drag on the first row only. does not scroll horizontally if i touch anywhere except the first row

## Steps to Reproduce the Problem

1. create two view. a parent view and a child view. have the spreadsheet control fill the entire childview (constraints created properly).
2. in code, add the child view to the parent view
3.

## Specifications

- Xcode version: 9.2
- iOS version: 11.2
- Dependency manager + version: carthage .26