A filter form cell is used to filter one or more values under a filter category. It is commonly used in the filter pattern for sorting and grouping.
Avoid using a filter form cell if the text is too long or if the number of values is more than 8. Use a list picker control for easier interaction.
Compact width filter form cell on iPhone (left), regular-readable width on iPad (right)
To select a value, the user taps on a filter button, which becomes highlighted and displays a blue checkmark to indicate it as a selection.
In the case of multiple selection, the user can tap on additional buttons. To deselect a selected value, the user taps again on the selection.
Filter form cell may be single selection or multi-selection. Depending on the use case, display a selected button by default or display all unselected buttons.