Supported Form Fields
ComPDFKit PDF SDK supports all form types specified by the PDF specification (such as text boxes, checkboxes, radio buttons, drop-down lists, pushbuttons, and signatures).
is the base class for all form fields, and CPDFWidgetAnnotation is subclass for CPDFAnnotation. A CPDFWidgetAnnotation object by itself is not useful, only subclasses (CPDFButtonWidgetAnnotation, CPDFChoiceWidgetAnnotation, CPDFTextWidgetAnnotation, CPDFSignatureWidgetAnnotation) are interesting. In parsing a PDF, however, any unknown or unsupported form fields will be represented as this base class.
We have to differentiate between field types and annotation objects:
| Type | Annotation Object |
|---|---|
| Check, Radio, and Push Buttons | CPDFButtonWidgetAnnotation |
| List and Combo Boxes | CPDFChoiceWidgetAnnotation |
| Text | CPDFTextWidgetAnnotation |
| Signatures | CPDFSignatureWidgetAnnotation |