Pickers display lists of items that are navigable using the Digital Crown. They are meant to be a precise and engaging way to manage selections. Pickers present their items in one of three styles.
List. Displays text and images in a scrolling list. This style displays the selected item and the previous and next items if those items are available.
Stack. Displays images in a card stack style interface. As the user scrolls, images are animated into position with the selected image on top. This style is best for photo browser interfaces.
Pickers can be configured to display an outline, caption, and scrolling indicator. These elements help identify the picker onscreen and help the user navigate its contents.
Use captions to clarify the meaning of items or of the picker itself. You can assign unique captions to items when the meaning of those items is unclear. Alternatively, assign the same caption to all items to identify the purpose of the picker itself.
Display a scroll indicator when the total number of items might not be obvious. A scroll indicator reflects the total number of items in a picker and shows the user’s position within the list. A scroll indicator is unnecessary when the sequence and number of items is obvious, such as specifying the number of seconds for a timer.
For developer guidance, see WKInterfacePicker.