Merge Multiple PDF Files on iOS

// Create `FileDataProvider` number one with a URL that points to a PDF.
let fileProvider1 = FileDataProvider(fileURL: writableURL1)
// Create `FileDataProvider` number two with a URL that points to a PDF.
let fileProvider2 = FileDataProvider(fileURL: writableURL2)
// Initialize the `Document` with an array of data providers.
let multipleFilesDocument = Document(dataProviders:[fileProvider1, fileProvider2])
// Create a default configuration.
let configuration = Processor.Configuration(document: multipleFilesDocument)!
// Initialize the processor.
let processor = Processor(configuration: configuration, securityOptions: nil)
// Write the merged document to disk.
try processor.write(toFileURL: mergedDocumentURL)
// Use the merged document.
let mergedDocument = Document(url: mergedDocumentURL)

// Create `PSPDFFileDataProvider` number one with a URL that points to a PDF.
PSPDFFileDataProvider *fileProvider1 = [[PSPDFFileDataProvider alloc] initWithFileURL:writableURL1];
// Create `PSPDFFileDataProvider` number two with a URL that points to a PDF.
PSPDFFileDataProvider *fileProvider2 = [[PSPDFFileDataProvider alloc] initWithFileURL:writableURL2];
// Initialize the `PSPDFDocument` with an array of data providers.
PSPDFDocument *multipleFilesDocument = [[PSPDFDocument alloc] initWithDataProviders:@[fileProvider1, fileProvider2]];
// Create a default configuration.
PSPDFProcessorConfiguration *configuration = [[PSPDFProcessorConfiguration alloc] initWithDocument:multipleFilesDocument];
// Initialize the processor.
PSPDFProcessor *processor = [[PSPDFProcessor alloc] initWithConfiguration:configuration securityOptions:nil];
// Write the merged document to disk.
[processor writeToFileURL:mergedDocumentURL error:NULL];
// Use the merged document.
PSPDFDocument *mergedDocument = [[PSPDFDocument alloc] initWithURL:mergedDocumentURL];

// Create a default configuration.
let processorConfiguration = Processor.Configuration(document: firstDocument)!
// Create a page template with the first page of the second document.
let pageTemplate = PageTemplate(document: secondDocument, sourcePageIndex: 0)
// Create a new page configuration.
let pageConfiguration = PDFNewPageConfiguration(pageTemplate: pageTemplate, builderBlock: nil)
// Add the first page from the second document as the second page (index 1) of the resulting merged document.
processorConfiguration.addNewPage(at: 1, configuration: PDFNewPageConfiguration(pageTemplate: pageTemplate, builderBlock: nil))
// Initialize the processor.
let processor = Processor(configuration: configuration, securityOptions: nil)
// Write the merged document to disk. Alternatively, you can use `output(to:)`
// to save the resulting document to a custom data source.
try processor.write(toFileURL: mergedDocumentURL)
// Use the merged document.
let mergedDocument = Document(url: mergedDocumentURL)

// Create a default configuration.
PSPDFProcessorConfiguration *processorConfiguration = [[PSPDFProcessorConfiguration alloc] initWithDocument:firstDocument];
// Create a page template with the first page of the second document.
PSPDFPageTemplate *pageTemplate = [[PSPDFPageTemplate alloc] initWithDocument:secondDocument sourcePageIndex:0];
// Create a new page configuration.
PSPDFNewPageConfiguration *pageConfiguration = [PSPDFNewPageConfiguration newPageConfigurationWithPageTemplate:pageTemplate builderBlock:NULL];
// Add the first page from the second document as the second page (index 1) of the resulting merged document.
[processorConfiguration addNewPageAtIndex:1 configuration:pageConfiguration];
// Initialize the processor.
PSPDFProcessor *processor = [[PSPDFProcessor alloc] initWithConfiguration:processorConfiguration securityOptions:nil];
// Write the merged document to disk. Alternatively, you can use `outputToDataSink:error:`
// to save the resulting document to a custom data source.
[processor writeToFileURL:mergedDocumentURL error:NULL];
// Use the merged document.
PSPDFDocument *mergedDocument = [[PSPDFDocument alloc] initWithURL:mergedDocumentURL];