The 11th lecture from Stanford’s Spring 2020 version of its iOS development course is the first of the final series of four lectures, all of which present topics intended to help the students with their final projects. Picker, a UI element for choosing from a list of items, is the primary topic here, but a demo code-base, Enroute, is introduced along the way in preparation for the next lecture. Enroute is a simple application which pulls information from the internet using a REST API in JSON format (though that is not the main topic of this lecture). This demo includes a review of presenting a UI via a modal sheet using NavigationView, Form, Toggle, etc.