21. SwiftUI Stacks and Frames
User interface design is largely a matter of selecting the appropriate interface components, deciding how those views will be positioned on the screen, and then implementing navigation between the different screens and views of the app.
As is to be expected, SwiftUI includes a wide range of user interface components to be used when developing an app such as button, label, slider and toggle views. SwiftUI also provides a set of layout views for the purpose of defining both how the user interface is organized and the way in which the layout responds to changes in screen orientation and size.
This chapter will introduce the Stack container views included with SwiftUI and explain how they can be used to create user interface designs with relative ease.
Once stack views have been explained, this chapter will cover the concept of flexible frames and explain how they can be used to control the sizing behavior of views in a layout.
