Generating PDF Reports in Swift: Libraries and Frameworks for iOS/macOS

Generating PDF Reports in Swift (iOS/macOS)

Creating PDF documents on Apple platforms is a key task when developing business applications, financial reports, or document management systems. Unlike the web stack, where many third-party libraries are used, the Swift ecosystem offers both powerful built-in frameworks and specialized third-party solutions for working with PDF. In this article, we will thoroughly examine all the main tools for generating PDF reports in Swift for iOS and macOS.

Apple's Built-in Frameworks

Apple provides two main ways to create PDF documents: UIGraphicsPDFRenderer (for UIKit) and PDFKit (for working with existing PDFs). macOS also offers NSGraphicsContext with PDF support.

UIGraphicsPDFRenderer (iOS 10+)

This is the primary tool for generating PDF from UIKit content. It allows you to draw text, images, tables, and arbitrary graphics in the context of a PDF page.

import UIKit

func generateReport(data: String) -> Data {    let pageSize = CGRect(x: 0, y: 0, width: 595.2, height: 841.8) // A4    let renderer = UIGraphicsPDFRenderer(bounds: pageSize)        return renderer.pdfData { context in        context.beginPage()                // Title        let title = "Sales Report"        let attributes: [NSAttributedString.Key: Any] = [            .font: UIFont.boldSystemFont(ofSize: 24),            .foregroundColor: UIColor.darkGray        ]        title.draw(at: CGPoint(x: 50, y: 50), withAttributes: attributes)                // Content        let textAttributes: [NSAttributedString.Key: Any] = [            .font: UIFont.systemFont(ofSize: 14)        ]        data.draw(at: CGPoint(x: 50, y: 100), withAttributes: textAttributes)                // Separator line        context.cgContext.setStrokeColor(UIColor.lightGray.cgColor)        context.cgContext.setLineWidth(1)        context.cgContext.move(to: CGPoint(x: 50, y: 90))        context.cgContext.addLine(to: CGPoint(x: 545, y: 90))        context.cgContext.strokePath()    }}

PDFKit (iOS 11+, macOS 10.13+)

PDFKit is a higher-level framework that allows not only creating but also editing existing PDFs. It supports annotations, forms, bookmarks, and working with multi-page documents.

import PDFKit

func createPDFWithText() -> PDFDocument {    let page = PDFPage()    let pdfDocument = PDFDocument()        // Create a page with text    let text = "PDFKit makes it easy to add text and annotations"    let textAnnotation = PDFAnnotation(        bounds: CGRect(x: 50, y: 700, width: 500, height: 100),        forType: .freeText,        withProperties: nil    )    textAnnotation.contents = text    textAnnotation.font = UIFont.systemFont(ofSize: 18)    page.addAnnotation(textAnnotation)        pdfDocument.insert(page, at: 0)    return pdfDocument}

Third-Party Libraries for Swift

Although the built-in tools cover most tasks, there are situations where specialized functionality is needed: working with templates, exporting to PDF from SwiftUI, or supporting complex layouts.

SwiftUI and PDF (iOS 14+, macOS 11+)

Starting with iOS 14, you can convert SwiftUI views to PDF using ImageRenderer:

import SwiftUI

struct ReportView: View {    var body: some View {        VStack(alignment: .leading) {            Text("Monthly Report")                .font(.largeTitle)                .foregroundColor(.blue)            Text("Data for August 2024")                .font(.headline)            Divider()            Text("Revenue: 1,234,567 ₽")                .font(.body)        }        .padding()    }}

func generatePDFFromSwiftUI() -> Data {    let vie