ULC provides the following converters:
aUlcField setConverter: UlcPercentValidator new
Code examples
The columns property indicates the initial number of characters the field should have. At creation time, the box layout mechanism attempts to provide the selected number of characters or more.
UlcField new setColumnns: 50
Changing the text shown in the field is done by calling the #setValue: method, for example:
aUlcField setValue: 'New text in my field'