Positioning UIView in UIViewController using NSLayoutConstraints causes aliased UILabel? - cocoa-touch

Question

I'm trying to manually animate in a UIView, contained in a UIViewController, from the top of the screen. This view will have a height of 150px.
I setup layout constraints for when it's "collapsed" and when it's "expanded" (shown). I animate between the two constraints when I want to hide/show, respectively.
I setup the view contained in this UIViewController in IB with a simple UILabel in the upper-left of the view.
CGFloat closeUpViewHeight = 150.f;
self.closeUpViewController = [[[CloseUpViewController_Phone alloc] initWithNibName:#"CloseUpViewController_Phone"
bundle:nil]
autorelease];
[self addChildViewController:self.closeUpViewController];
[self.view addSubview:self.closeUpViewController.view];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.closeUpViewController.view
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeHeight
multiplier:0.f
constant:closeUpViewHeight]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.closeUpViewController.view
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeWidth
multiplier:1.f
constant:0.f]];
[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.closeUpViewController.view
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeCenterX
multiplier:1.f
constant:0.f]];
self.expandedCloseUpViewConstraint = [NSLayoutConstraint constraintWithItem:self.closeUpViewController.view
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeTop
multiplier:0.f
constant:0.f];
self.collapsedCloseUpViewConstraint = [NSLayoutConstraint constraintWithItem:self.closeUpViewController.view
attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeTop
multiplier:1.f
constant:-1.f];
Anyone know why the resulting UILabel has aliasing problems?

Answer 1

Fixed my problem, pretty dumb mistake.
Inside the setup for my view controller, I added a drop shadow to the UIView and accidentally had carried over this:
self.view.layer.masksToBounds = NO;
self.view.layer.shadowOffset = CGSizeMake(0, 2);
self.view.layer.shadowRadius = 3;
self.view.layer.shadowOpacity = 0.8;
self.view.layer.shouldRasterize = YES; //<--- Don't rasterize.
Removing the shouldRasterize line fixes the issue here.