Forms

Foxit PDF SDK for iOS provides PDF AcroForm support via Core SDK: read, fill, import/export, and manage form fields.

UI Extensions built-in forms

With the full reader (UI Extensions), users can fill text fields, checkboxes, radio buttons, and other controls in the UI—no extra code required.

Core classes

Class	Description
FSForm	Form object for all interactive fields
FSField	Form field (text, checkbox, radio, list, combo, etc.)
FSControl	Control instance for field appearance and interaction on a page

Field type constants

Constant	Description
FSFieldTypeUnknown	Unknown
FSFieldTypePushButton	Button
FSFieldTypeCheckBox	Checkbox
FSFieldTypeRadioButton	Radio button
FSFieldTypeComboBox	Combo box
FSFieldTypeListBox	List box
FSFieldTypeTextField	Text field
FSFieldTypeSignature	Signature field

Example: read and fill fields

#import <FoxitRDK/FSPDFObjC.h>

FSPDFDoc *doc = [[FSPDFDoc alloc] initWithPath:@"path/to/form.pdf"];
[doc load:nil];

BOOL hasForm = [doc hasForm];
if (!hasForm) return;

FSForm *form = [[FSForm alloc] initWithDocument:doc];

// Enumerate fields
int fieldCount = [form getFieldCount:@""];
for (int i = 0; i < fieldCount; i++) {
    FSField *field = [form getField:i filter:@""];
    NSString *name = [field getName];
    FSFieldType type = [field getType];
    NSString *value = [field getValue];

    NSLog(@"字段: %@, 类型: %d, 值: %@", name, (int)type, value);
}

// Set text field value
FSField *textField = [form getField:0 filter:@""];
[textField setValue:@"填写的内容"];

[doc saveAs:@"path/to/output.pdf" saveFlags:FSPDFDocSaveFlagNormal];

Example: import and export form data

FSForm *form = [[FSForm alloc] initWithDocument:doc];

// Export to XML
BOOL exported = [form exportToXML:@"path/to/formdata.xml"];

// Import from XML
BOOL imported = [form importFromXML:@"path/to/formdata.xml"];

[doc saveAs:@"path/to/output.pdf" saveFlags:FSPDFDocSaveFlagNormal];

API reference

See the API reference for FSForm, FSField, and FSControl.