How can I render a custom view in a UIScrollView at varying zoom levels without distorting the view?

Posted by eczarny on Stack Overflow See other posts from Stack Overflow or by eczarny
Published on 2009-01-08T21:02:04Z Indexed on 2010/04/09 22:23 UTC
Read the original article Hit count: 316

Filed under:

cocoa-touch

The scenario:

I have a custom view (a subclass of UIView) that draws a game board. To enable the ability to zoom into, and pan around, the board I added my view as a subview of UIScrollView. This kind of works, but the game board is being rendered incorrectly. Everything is kind of fuzzy, and nothing looks right.

The question:

How can I force my view to be redrawn correctly ay varying scales? I'm providing my view with the current scale and sending it a setNeedsDisplay message after the scroll view is done zooming in/out, but the game board is still being rendered incorrectly. My view should be redrawing the game board depending on the zoom level, but this isn't happening. Does the scroll view perform a generic transformation on subviews? Is there a way to disable this behavior?

Related posts about cocoa-touch

adding UIImageView to UIScrollView throws exception cocoa touch for iPad

as seen on Stack Overflow - Search for 'Stack Overflow'
I am a noob at OBJ-C :) I am trying to add a UIImageView to a UIScrollView to display a large image in my iPad app. I have followed the tutorial here exactly: http://howtomakeiphoneapps.com/2009/12/how-to-use-uiscrollview-in-your-iphone-app/ The only difference is that in my App the View is… >>> More
Cocoa Touch text view with aligned, justified text

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to create a textview with predefined height that will contain justified text. When entering the text into the view, I need to be able to check when the view is full. How would I do this? Core Text? I am using sdk-3.2. >>> More
Managing subviews in Cocoa Touch

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm developing an iPhone app. I need to create a Quiz application that has different Question views embedded in it (see my similar question). Different types of Question will have different behavior, so I plan to create a controller class for each type of Question. The MultipleChoiceQuestionController… >>> More
Reading .ppt (MS PowerPoint) file in Cocoa Touch

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All, Any idea how to read a .ppt file in Cocoa Touch ? I tried to load the contents of the file in UIWebView but it didn't work. Here is the code : [aWebView loadData:[NSData dataWithContentsOfFile:filePath] MIMEType:@"application/vnd.ms-powerpoint" textEncodingName:@"utf-8" … >>> More
Repeating events on a gregorian calendar in Cocoa Touch

as seen on Stack Overflow - Search for 'Stack Overflow'
How would I set up a gregorian calendar in cocoa touch and set an event that will repeat every X days? Thanks >>> More

Developer IT