How to implement a date picker calendar in ios with swift such as expedia, airbnb, others

Having a very difficult time finding any direction on how to implement this solution in swift vs obj c. I've taken a look already at Kal and any other resources both for calendar views and date pickers for swift specifically with little found for cocoa touch as well.

Wanting to be able to implement a calendar view that allows for the user to select a starting date and and ending date that will automatically select everything in-between those dates such as you see in Airbnb, Expedia, etc native iOS apps (although their programmed in obj c not swift).

Are there any examples, existing libraries, or any information on how to implement this type of view and functionality in iOS using swift specifically?