Search Text in PDF ​

// Init Methods
- (instancetype)initWithDocument:(CPDFDocument *)document {
  CPDFDocument *myDocument = document;
  [self searchText:myDocument];
}

// Search text
- (void)searchText:(CPDFDocument *)oldDocument {
  NSString *commandLineStr = @"" 
  
  // Get Sandbox path for saving the PDFFile
  NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
  NSString *writeDirectoryPath = [NSString stringWithFormat:@"%@/%@", path, @"TextSearch"];

  if (![[NSFileManager defaultManager] fileExistsAtPath:writeDirectoryPath])
      [[NSFileManager defaultManager] createDirectoryAtURL:[NSURL fileURLWithPath:writeDirectoryPath] withIntermediateDirectories:YES attributes:nil error:nil];
  NSString *writeFilePath = [NSString stringWithFormat:@"%@/%@.pdf",writeDirectoryPath,@"TextSearchTest"];

  // Save the document in the test PDF file
  NSURL *textSearchURL = [NSURL fileURLWithPath:writeFilePath];
  [oldDocument writeToURL:textSearchURL];

  // Create a new document for test PDF file
  CPDFDocument *document = [[CPDFDocument alloc] initWithURL:textSearchURL];

  // Get array of search result
  NSArray *resultArray = [document findString:@"PDF" withOptions:CPDFSearchCaseInsensitive];

  // Get the first page of search resultsGet the first page of search results
  NSArray *selections = [resultArray objectAtIndex:0];
  commandLineStr = [commandLineStr stringByAppendingFormat:@"the key PDF have %lu results", selections.count];

  // Get the first search result on the first page
  CPDFSelection *selection = [selections objectAtIndex:0];

  // Set text hignlinght
  NSMutableArray *quadrilateralPoints = [NSMutableArray array];
  CPDFPage *page = [document pageAtIndex:0];

  CGRect bounds = selection.bounds;
  [quadrilateralPoints addObject:[NSValue valueWithCGPoint:CGPointMake(CGRectGetMinX(bounds), CGRectGetMaxY(bounds))]];
  [quadrilateralPoints addObject:[NSValue valueWithCGPoint:CGPointMake(CGRectGetMaxX(bounds), CGRectGetMaxY(bounds))]];
  [quadrilateralPoints addObject:[NSValue valueWithCGPoint:CGPointMake(CGRectGetMinX(bounds), CGRectGetMinY(bounds))]];
  [quadrilateralPoints addObject:[NSValue valueWithCGPoint:CGPointMake(CGRectGetMaxX(bounds), CGRectGetMinY(bounds))]];

  CPDFMarkupAnnotation *highlight = [[CPDFMarkupAnnotation alloc] initWithDocument:document markupType:CPDFMarkupTypeHighlight];
  highlight.color = [UIColor yellowColor];
  highlight.quadrilateralPoints = quadrilateralPoints;
  [page addAnnotation:highlight];

  // Save the text search action in document
  [document writeToURL:self.textSearchURL];

  commandLineStr = [commandLineStr stringByAppendingString:@"Done.\n"];
  commandLineStr = [commandLineStr stringByAppendingString:@"Done. Results saved in TextSearchTest.pdf\n"];
}