PDFReader - Smart PDF Reader and Editor

Description

• Now it work only for all IPads, because i used UIPopovers. (You can change it, if you want)
• User can open PDFDocuments from native iOS application "Files"
• PDFDocument automatically saved and synchronizes in ICloud.
• User can highlighted annotation for selected area which finger determined.
• If you want delete annotations - turn on "Pencil Mode" and tap to area!

How it works?

• I used native PDFKit:

  • https://developer.apple.com/documentation/pdfkit

• For work with documents: UIDocumentPickerViewController:

  • https://developer.apple.com/documentation/uikit/uidocumentpickerviewcontroller

• Highlighted text: UITouch and PDFSelection:

  • UITouch dont called when PDFDocument is open.
  • I solved this problem. (Read the text below)

• Handle UITouchDelegate:

  • Put subview on PDFView when user turn on "Pencil Mode"
  • Subiew removed from super view when called method: UITouchEnded
  • Use property:

      @property (assign, nonatomic) CGPoint startPoint;
      @property (assign, nonatomic) CGPoint currentMovePoint;
      @property (assign, nonatomic) CGPoint endPoint;
     
  

• In touchesBegan: method we will get the coordinates of the first point.

• ❗️ Dont forget! PDFPage and UIVew - different coordinate systems

  • Call this method for convert points from UIView to PDFView page.

    [PDFView* view convertPoint:point toPage:self.readerPDF.currentPage]

     -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
       [super touchesBegan:touches withEvent:event];
   
       UITouch *touch = [touches anyObject];
   
       CGPoint point = [touch locationInView:self.viewForTouch];
   
       self.startPoint = [self.readerPDF convertPoint:point toPage:self.readerPDF.currentPage];
     
     }

• In touchesMoved: method we will get the coordinates of the moved point.

   -(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
     [super touchesMoved:touches withEvent:event];
 
     UITouch *touch = [touches anyObject];
     CGPoint point = [touch locationInView:self.viewForTouch];
 
     self.endPoint = [self.readerPDF convertPoint:point toPage:self.readerPDF.currentPage];
     self.currentMovePoint = [self.readerPDF convertPoint:point toPage:self.readerPDF.currentPage];
 
     PDFSelection* selection = [self.readerPDF.currentPage selectionFromPoint:self.startPoint toPoint:self.currentMovePoint];
     
     NSArray* arraySelections = [selection selectionsByLine];
 
     [self.readerPDF setHighlightedSelections:arraySelections];
     [self.readerPDF setCurrentSelection: selection];

 }

• In touchesEnded: method:

  -(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
     [super touchesEnded:touches withEvent:event];
 
     UITouch *touch = [touches anyObject];
     CGPoint point = [touch locationInView:self.viewForTouch];
 
     self.endPoint = [self.readerPDF convertPoint:point toPage:self.readerPDF.currentPage];

     PDFSelection* selection = [self.readerPDF.currentPage selectionFromPoint:self.startPoint toPoint:self.endPoint];
 
     NSArray* array = [selection selectionsByLine];
 
         for (PDFSelection* select in array) {
 
             PDFAnnotation* annotation = [[PDFAnnotation alloc] initWithBounds:[select boundsForPage:self.readerPDF.currentPage] forType:PDFAnnotationSubtypeHighlight withProperties:nil];
             
             [self.readerPDF.currentPage addAnnotation:annotation];
         }
}

• Well done! After this we get perfect PDFSelection. And add annotation to selections coordinats.

Examples:

Just select and autohighlight:

Also you can use colors from beautiful pallet color:

Look and navigate on all annotations:

Just Tap and Remove annotations! :

It's look so nice: