Hey folks, On the Mac we have NSClipView (and NSScrollView). On iOS we have UIScrollView and yet sometimes I wondering why.
Let me explain: For an iOS project I have an image that does not fit on the screen. I need to be able to show a portion of it to the user. There are couple of ways to approach this. 1) I could just create an UIImageView and just move the origin into the negative. The clipping happens naturally through the parent view. 2) I could use a UIScrollView and add the large UIImageView to it and move the content offset 3) I could have a custom view that basically just draws a portion of the image. Something along the lines of CGImageRef imageRef = CGImageCreateWithImageInRect([largeImage CGImage], cropRect); [UIImageView setImage:[UIImage imageWithCGImage:imageRef]]; CGImageRelease(imageRef); Now I am trying to understand the details of the different approaches. When I change the origin of view I assume the system is smart enough to copy content over. So what could be a reason to use UIScrollView (or NSClipView on Mac) for this? I assume 3) should be the worst option as it redraws the complete content. But maybe I am also just completely off. Which option would you pick and why? Some insights would be appreciated. What docs should I read that I haven't? cheers, Torsten _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
