CGContext pdf page aspect fit

Question

I am displaying a pdf page on the CGContext using the code

- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)context
{
    CGContextSetRGBFillColor(         


        

Answer 1

Here is my solution, which also handles rotation. Might by useful.

// Create transformation
int rotation = CGPDFPageGetRotationAngle(pdfPage);
CGRect rect = CGPDFPageGetBoxRect(pdfPage, kCGPDFCropBox);
CGRect rotatedRect = rect;
CGRectApplyAffineTransform(rotatedRect, CGAffineTransformMakeRotation(M_PI * rotation / 180.0));

CGFloat scale = MIN(self.bounds.size.width / rotatedRect.size.width, self.bounds.size.height / rotatedRect.size.height);
// Scale
CGContextConcatCTM(context, CGAffineTransformMakeScale(scale, scale));  
// Move left bottom cornet to 0, 0
CGContextConcatCTM(context, CGAffineTransformMakeTranslation(rotatedRect.size.width * 0.5, rotatedRect.size.height * 0.5));    
// Rotate
CGContextConcatCTM(context, CGAffineTransformMakeRotation(-M_PI * rotation / 180.0));    
// Move center into 0, 0
CGContextConcatCTM(context, CGAffineTransformMakeTranslation(-rect.origin.x - rect.size.width * 0.5, -rect.origin.y - rect.size.height * 0.5));

CGContextDrawPDFPage(context, pdfPage);