Adding outline shadow to a UIView which is iOS 3.0 compatible - iphone

Question

I have two UIViewControllers A and B and they are added as subviews in the AppDelegate with B on top of A.
When a UIButton on B is tapped B slides off to the left with the following code:
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(slideOutFinished)];
simonSaysView.view.frame = CGRectMake(40-BView.view.frame.size.width, BView.view.frame.origin.y, BView.view.frame.size.width, BView.view.frame.size.height);
[UIView commitAnimations];
On the right edge I want a 20px drop shadow but i cannot use the shadow properties of BView.view.layer.shadow.... because its 3.2/4.0+ only. And the performance of the animation is awful, the slide is lagging extremely much (Its fluent without the shadow).
I'm thinking using a custom UIView and do some magic in drawRect but is this possible or can i only draw within the bounds of the view?
Hope some of you guys and girls can help me.
Cheers
objneodude

Answer 1

Solved with the following code
// Add drop shadow to the view.
CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.frame = CGRectMake(self.view.frame.size.width, 0, 30, self.view.frame.size.height);
gradientLayer.colors = [NSArray arrayWithObjects:
(id)[UIColor blackColor].CGColor,
(id)[UIColor clearColor].CGColor,
nil];
gradientLayer.startPoint = CGPointMake(-2, 0.5);
gradientLayer.endPoint = CGPointMake(1, 0.5);
[self.view.layer addSublayer:gradientLayer];

Answer 2

I had the same problem, after trying various ideas, I just added a subview a shadow colour (Gray) behind the UIView I needed to have a shadow, see code: (Included is the code for >3.2.x/4.x as well.
/*Shaded/rounded borders on subviews*/
self.viewOne.layer.cornerRadius = 10;
self.viewOne.layer.borderColor = [UIColor darkGrayColor].CGColor;
self.viewOne.layer.borderWidth = 0.8;
self.viewTwo.layer.cornerRadius = 10;
self.viewTwo.layer.borderColor = [UIColor darkGrayColor].CGColor;
self.viewTwo.layer.borderWidth = 0.8;
self.viewThree.layer.cornerRadius = 10;
self.viewThree.layer.borderColor = [UIColor darkGrayColor].CGColor;
self.viewThree.layer.borderWidth = 0.8;
if (SYSTEM_VERSION_LESS_THAN(#"3.2")) {
self.shadowOne.layer.cornerRadius = 10;
self.shadowTwo.layer.cornerRadius = 10;
self.shadowThree.layer.cornerRadius = 10;
}
else{
//Use QuartzCore to make shadows etc.
self.viewOne.layer.shadowColor = [[UIColor grayColor] CGColor];
self.viewOne.layer.shadowOffset = CGSizeMake(2, 2);
self.viewOne.layer.shadowOpacity = 0.6;
self.viewOne.layer.shouldRasterize = YES;
self.viewOne.layer.shadowRadius = 2;
self.viewTwo.layer.shadowColor = [[UIColor grayColor] CGColor];
self.viewTwo.layer.shadowOffset = CGSizeMake(2, 2);
self.viewTwo.layer.shadowOpacity = 0.6;
self.viewTwo.layer.shouldRasterize = YES;
self.viewTwo.layer.shadowRadius = 2;
self.viewThree.layer.shadowColor = [[UIColor grayColor] CGColor];
self.viewThree.layer.shadowOffset = CGSizeMake(2, 2);
self.viewThree.layer.shadowOpacity = 0.6;
self.viewThree.layer.shouldRasterize = YES;
self.viewThree.layer.shadowRadius = 2;
}