Changing the text and background color with Apple's PDFKit framework

I'd like to change the text and background color of a displayed PDF document using Apple's PDFKit Framework to show the documents in "Night Mode" (dark background, light foreground, just like in Adobe Reader).

I know the PDFPage class has a drawWithBox:toContext: method, which can be overwritten in a subclass to add effects (like watermark, as shown in this WWDC 2017 session), but I don't know how to set the color properties.

Is there a way to do this with the PDFKit library or any other low-level API (Quartz) from Apple?

1 Answers

Answers 1

For giving text color in pdf you can use,

-(CGRect)addText:(NSString*)text withFrame:(CGRect)frame font:(NSString*)fontName fontSize:(float)fontSize andColor:(UIColor*)color{     const CGFloat *val = CGColorGetComponents(color.CGColor);      CGContextRef    currentContext = UIGraphicsGetCurrentContext();     CGContextSetRGBFillColor(currentContext, val[0], val[1], val[2], val[3]);     UIFont *font =  [UIFont fontWithName:fontName size:fontSize];     CGSize stringSize = [text sizeWithFont:font constrainedToSize:CGSizeMake(pageSize.width - 2*20-2*20, pageSize.height - 2*20 - 2*20) lineBreakMode:NSLineBreakByWordWrapping];      CGRect renderingRect = CGRectMake(frame.origin.x, frame.origin.y, textWidth, stringSize.height);      [text drawInRect:renderingRect withFont:font lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentLeft];      frame = CGRectMake(frame.origin.x, frame.origin.y, textWidth, stringSize.height);      return frame; } 

And for background color, use the following

CGContextRef currentContext = UIGraphicsGetCurrentContext();     CGContextSetFillColorWithColor(currentContext, [UIColor blueColor].CGColor );     CGContextFillRect(currentContext, CGRectMake(0, 110.5, pageSize.width, pageSize.height)); 

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