How to limit multi-select options number?

[Sean-Wang]

@{FXFormFieldKey: @"interests", FXFormFieldPlaceholder: @"None", FXFormFieldOptions: @[@"Videogames", @"Animals", @"Cooking"]}

For example, I want to limit multi-select number is two, how to achieve this?

[nicklockwood]

Currently there's no way to enforce this other than to check when the form is submitted and display an alert telling the user to select fewer options.

[realcarlos]

Thanks a lot ,but if there a option to set the limit when new a form ,will be perfect.