Generate a paginated PDF based on a NSString. Adds an image and person's name on the last page. Shared under MIT license.

PDFGenerator.h

//
//  PDFGenerator.h
//  
//
//  Created by Brian Broom on 12/10/15.
//  Copyright © 2015 Brian Broom. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface PDFGenerator : NSObject

- (NSData *)generateWithAgreementText:(NSString *)agreementText signatureImage:(UIImage *)signatureImage fullName:(NSString *)fullName;

@end

PDFGenerator.m

//
//  PDFGenerator.m
//  
//
//  Created by Brian Broom on 12/10/15.
//  Copyright © 2015 Brian Broom. All rights reserved.
//

@import UIKit;

#import "PDFGenerator.h"
#import "Person.h"

@implementation PDFGenerator

- (NSData *)generateWithAgreementText:(NSString *)agreementText signatureImage:(UIImage *)signatureImage fullName:(NSString *)fullName {
  
  // layout text pages
  UIFont *textFont = [UIFont fontWithName:@"Avenir Next" size:12.0];
  NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
  paragraphStyle.lineHeightMultiple = 1.2;
  paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
  
  NSDictionary *textAttributes = @{ NSParagraphStyleAttributeName : paragraphStyle, NSFontAttributeName : textFont };
  NSAttributedString *styledString = [[NSAttributedString alloc] initWithString:agreementText attributes:textAttributes];
  
  NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:styledString];
  NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
  layoutManager.usesFontLeading = YES;
  [textStorage addLayoutManager:layoutManager];

  // Create the PDF context using page size of 612 x 792 (8.5x11 at 72dpi).
  CGSize pageSize = CGSizeMake(612, 792);
  CGRect pageRect = CGRectMake(0, 0, pageSize.width, pageSize.height);
  // 0.5" margin top, bottom
  CGRect pageRectWithoutMargin = CGRectInset(pageRect, 36, 36);
  CGSize pageSizeWithoutMargin = pageRectWithoutMargin.size;
  CGPoint textRenderingStartPoint = pageRectWithoutMargin.origin;
  
  while ([self needsMorePagesForLayoutManager:layoutManager]) {
    [self addPageToLayoutManager:layoutManager withSize:pageSizeWithoutMargin];
  }

  // open PDF context
  NSMutableData *pdfData = [NSMutableData new];
  UIGraphicsBeginPDFContextToData(pdfData, pageRect, nil);
  
  // render pages
  for (NSTextContainer *container in layoutManager.textContainers) {
    UIGraphicsBeginPDFPage();
    
    NSRange glyphRangeForPage = [layoutManager glyphRangeForTextContainer:container];
    [layoutManager drawBackgroundForGlyphRange:glyphRangeForPage atPoint:textRenderingStartPoint];
    [layoutManager drawGlyphsForGlyphRange:glyphRangeForPage atPoint:textRenderingStartPoint];
  }
  
  // add image on new page
  UIGraphicsBeginPDFPage();

  [fullName drawAtPoint:CGPointMake(150, 100) withAttributes:textAttributes];
  [signatureImage drawInRect:CGRectMake(150, 200, 200, 100)];
  
  // Close the PDF context and write the contents out.
  UIGraphicsEndPDFContext();
  return pdfData;
}

- (BOOL)needsMorePagesForLayoutManager:(NSLayoutManager *)layoutManager {
  if (layoutManager.textContainers.count == 0) {
    return YES;
  }
  
  NSRange glyphRange = [layoutManager glyphRangeForTextContainer:layoutManager.textContainers.lastObject];
  NSUInteger numberOfGlyphs = [layoutManager numberOfGlyphs];
  
  if (glyphRange.location + glyphRange.length < numberOfGlyphs) {
    return YES;
  }
  
  return NO;
}

- (void)addPageToLayoutManager:(NSLayoutManager *)layoutManager withSize:(CGSize)pageSizeWithoutMargin {
  NSTextContainer *container = [[NSTextContainer alloc] initWithSize:pageSizeWithoutMargin];
  [layoutManager addTextContainer:container];
}

@end

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