The controls are attached to AUParameter entities, so changes in the control will affect their associated AUParameter value. This works the other way as well: external changes to the AUParameter -- say from a MIDI controller or preset load -- will be reflected in the control.
There is a circular knob that acts like a vertical slider. It normally shows the setting's name, but when being manipulated it shows the current value.
- Vertical dragging changes the value of the knob
- Moving horizontally away from the center of the knob will increase resolution of vertical movements
- Touching the title will show an editor to allow typing a value
- When present, uses
ScrollViewProxyto make sure that the editor is visible when it appears
The toggle view just works on boolean values:
Here is a combination of several knobs into two distinct groups. The groups are embedded in a scroll view so as to operate under narrow device width constrains: