Type Default Value Read Only Description
Boolean True No Whether the viewer should automatically regenerate field appearances.




This property determines whether the NeedAppearances flag in the PDF is set when field values are changed.

The NeedAppearances flag signals to the viewing application that field appearances should be automatically generated rather than using the appearance embedded in the PDF.

It is generally best to allow the viewing application to generate its own appearances and use the pre-generated ones as a fallback.

It is unlikely you will want to change the value of this property.