Nowadays even though Apple does not really support sidebars as they encourage tab instead but a lot of apps still prefer to use this approach. There are a lot sidebar libraries in cocoapods but in the end I choose:
ECSlidingViewController
ECSlidingViewController is a view controller container that manages a layered interface. The top layer anchors to the left or right side of the container while revealing the layer underneath it. This is most commonly known as the “Side Menu”, “Slide Out”, “Hamburger Menu/Drawer/Sidebar”, etc…
*image source here*
Sesame.Notes 