This folder contains a simple app that demonstrates the controls. It runs on both iOS and macOS.
The first tab of the app shows a collection of two float parameters and two boolean ones. The top of the view contains controls from the AUv3Controls package, while the botton shows native macOS/iOS controls. Both sets of controls monitor the same set of AUParameter entities, so when one set changes the AUParameter value, the other controls update automatically when they receive notice of the change in value. All of this monitoring and signalling is done using the AUParameterTree data structure that holds the collection of AUParameter entities defined by the app.
The second tab of the app shows two sets of envelope settings for a hypothetical synthesizer. The collection scrolls if the device is too small to show all of the knobs at the same time. Tapping/clicking on a knob's title will bring up an editor for setting a value using the keyboard.