KNMultiItemSelector is a drop-in multiple items selector for iOS projects. It works with both iPhone and iPad.
It is best used for selecting several items in a long list of hundreds or thousands of items such as contact list or Facebook friend lists.
A fully customisable control to select telephone (but you can use it to select another data) as whatsapp application, it supports multiselection. Supports English and Spanish.
Easy to use and customisable.