I have subclassed UIView object inside a uiscrollview which displays a pdf page. I can zoom that page. But when I do so, the inside view is zoomed and is getting blurred. I understood that the inner view shud be refreshed and i called setNeedsDisplay. But no change have happened and its the same even now. Below is the code for drawRect for the subclassed uiview.

- (void)drawRect:(CGRect)rect
{
if(document)//the pdf document object
{       
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGContextSaveGState(ctx);
    CGContextTranslateCTM(ctx, 0.00, [self bounds].size.height);
    NSLog(@"%f",[self bounds].size.height);
    CGContextScaleCTM(ctx, 1.0, -1.0);
    CGContextConcatCTM(ctx, CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, 
                                                         [self bounds], 0, true));
    CGContextDrawPDFPage(ctx, page);    
    CGContextRestoreGState(ctx);
}
}