• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: [iPhone] more UIScrollView
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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);
> }
>
> _______________________________________________
>
> Cocoa-dev mailing list (email@hidden)
>
> Please do not post admin requests or moderator comments to the list.
> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>
> Help/Unsubscribe/Update your Subscription:
>
> This email sent to email@hidden

_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden

  • Follow-Ups:
    • Re: [iPhone] more UIScrollView
      • From: Development <email@hidden>
References: 
 >[iPhone] more UIScrollView (From: Development <email@hidden>)

  • Prev by Date: populating radio stations like iTunes
  • Next by Date: Re: Best persistence method for a glossary app in iPhone?
  • Previous by thread: [iPhone] more UIScrollView
  • Next by thread: Re: [iPhone] more UIScrollView
  • Index(es):
    • Date
    • Thread