iOS
ComPDFKit Conversion SDK
Guides

Convert PDF Documents to RTF Documents  

// Get the path of the PDF file.
NSString *pdfPath = @"...";
// Get the path to the RTF file.
NSString *outputPath = @"...";

CPDFConverterRtf *converter = [[[CPDFConverterRtf alloc] initWithURL:[NSURL fileURLWithPath:pdfPath] password:nil] autorelease];
[converter convertToFilePath:outputPath pageIndexs:nil options:nil];