I knew I was going to want to do something like that myself so created a small test project.
You need to have the scrollview, the clipview, and the document view all layer backed for it to work with the scrollview magnification. You shouldn't need to explicitly set the autoresizesSubviews on. It should all scale just like a non layer-backed view, scaling the subviews with it. All that works fine if you don't change the bounds origin. The subviews are positioned relative to the bounds origin, so changing the bounds origin positions the subviews in the place you want…but it does break the drawing of the view itself. I haven't found a way to draw a layer backed view which has its bounds origin shifted yet. I thought using a CGContextTranslateCTM in the drawing code would work, but got nowhere with that. If I set the bounds origin to be 10,10 then my view tiles would get drawn with a 10px gap between them, and the drawing would start at 10,10. If I set the bounds origin to -10,-10, then the view tiles would be drawn with a 10px gap between them and the drawing would start at -10,-10 which means that there is a 20px gap along the top and left of the view. Clearly layer backed views don't like to have their bounds origins shifted. I guess the problems stem from the way the drawing code draws the content into the layer, but am not certain how to fix it. Can anyone else help with how to draw a layer backed view where the bounds origin has been shifted? Regards Gideon _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
