In the above example the font used to display text on a view was declared using a built-in text style (in this case the large title style).
iOS provides a way for the user to select a preferred text size which applications are expected to adopt when displaying text. The current text size can be configured on a device via the Settings -> Display & Brightness -> Text Size screen which provides a slider to adjust the font size as shown below:
Figure 20-2
If a font has been declared on a view using a text style, the text size will dynamically adapt to the user’s preferred font size. Almost without exception, the built-in iOS apps adopt the preferred size setting selected by the user when displaying text and Apple recommends that third-party apps also conform to the user’s chosen text size. The following text style options are currently available:
•Large Title
•Title, Title2, Title 3
•Headline...
