We create PDF files with iText (in Java) which are working fine on Windows / Android, however when we open such file on an iPhone the acroFields that were set in the code are empty.
We are using the following code and the setGenerateAppearances is already set to true.
PdfStamper pdfStamper = new PdfStamper(templateReader, pagePdf);
AcroFields acroFields = pdfStamper.getAcroFields();
As stated by Bruno Lowagie, the issue can be resolved by using the flatten option, which should be set before the pdfStamper.close() has been called:
// flatten the PDF (so the values are visible when PDF is downloaded on iOS / OS X) pdfStamper.setFormFlattening(true);