Problem animating size change in a custom-drawn view

I have a custom UIView that implements drawRect to render itself with a gradient background and a 1-pixel black border around the edge, and some text.

In my parent view controller, I am attempting to animate my custom view from its original small size to full-screen, using this code:

[UIView beginAnimations:nil context:NULL];
CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
CGRect detailRect = CGRectOffset(screenRect, 0, -screenRect.origin.y); 
[dayDetail.view setFrame:detailRect];
[UIView commitAnimations];

This works, but drawRect in my custom view is only called once when the view is initially created. As a result the resizing just takes the original s开发者_JAVA百科mall image and blows it up to full screen, so the border of the full-size view is now many pixels wide instead of one, and the text gets expanded in size as well.

Is there any way to set this up so that drawRect is called continuously as the view is being animated from small to full-screen? Basically, I want my custom rendering code to handle the appearance of the view no matter what size it is at any point in time.

I've had the exact same problem and this is how I solved it:

dayDetail.view.contentStretch = CGRectMake(0.5, 0.5, 0.0, 0.0);

That will stretch the middle pixel only. Read the documentation to learn how to modify that behavior. You could certainly ask me, but reading the documentation is probably quicker. Besides, I would probably just quote the documentation.