Re: [iPhone] more UIScrollView
Re: [iPhone] more UIScrollView
- Subject: Re: [iPhone] more UIScrollView
- From: Scott Anguish <email@hidden>
- Date: Tue, 1 Jun 2010 23:38:59 -0400
The last portion of chapter the Basic Scrolling Using the Pinch Gestures in ScrollView Programming Guide for iPhone is called
Ensuring that Zoomed Content is Sharp when Zoomed
It has an example (engineering approved) way of handling this. It isn’t the greatest solution available, but it is the currently recommended method.
On Jun 1, 2010, at 11:03 PM, Development wrote:
> Ok, well I've worked out most of the other issues I've run in to. However the one I am now unable to really figure out has to do with zooming scroll view contents and winding up with a clear image. The problem is that I'm not getting a clear image.
> Is it possible to use the built in zooming methods to zoom an image and keep it clear or do I have to basically implement my own zooming methods. I read the zooming docs and unfortunately they did not help me to understand what to do.
>
> This is the drawing code from the view that is being zoomed.
>
> -(void)drawLayer:(CALayer*)layer inContext:(CGContextRef)context
> {
>
> CGRect newRect = self.bounds;
> float scle =CGContextGetCTM(context).a;
>
> CGRect rect =CGContextGetClipBoundingBox(context);
>
> CGContextSaveGState(context);
> CGContextSetRGBFillColor(context, 1.0,1.0,1.0,1.0);
> CGContextFillRect(context,self.bounds);
> CGContextTranslateCTM(context, 0.0, newRect.size.height);
> CGContextScaleCTM(context, 1.0, -1.0);
> CGContextScaleCTM(context, scle,scle);
>
> CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(myPage, kCGPDFCropBox, newRect, 0, true);
> CGContextConcatCTM(context, pdfTransform);
> CGContextDrawPDFPage(context, myPage);
>
> CGContextRestoreGState(context);
> }
>
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