How do I draw a shadow under a UIView?

I'm trying to draw a shadow under the bottom edge of a UIView in Cocoa Touch. I understand that I should use CGContextSetShadow() to draw the shadow, but the Quartz 2D programming guide is a little vague:

UIImagePickerController, UIImage, Memory and More?

I've noticed that there are many questions about how to handle UIImage objects, especially in conjunction with UIImagePickerController and then displaying it in a view (usually a UIImageView ). Here is a collection of common questions and their answers. Feel free to edit and add your own.

How to create a colored 1x1 UIImage on the iPhone dynamically?

I would like to create a 1x1 UIImage dynamically based on a UIColor.

iPhone board game: OpenGL ES or CoreGraphics?

I want to program a board game (similar to checkers) for the iPhone. Would OpenGL ES or CoreGraphics be a better option? What do most games of this type on the App Store use?

Inner shadow effect on UIView layer?

I have the following CALayer:

CAGradientLayer *gradient = [CAGradientLayer layer];

gradient.frame = CGRectMake(8, 57, 296, 30);

gradient.cornerRadius = 3.0f;

gradient.colors = [NSArray arrayWithObjects:(id)[RGB(130, 0, 140) CGColor], (id)[RGB(108, 0, 120) CGColor], nil];

[self.layer insertSublayer:gradient atIndex:0];

NSLog with CGPoint data

I have a CGPoint called point that is being assigned a touch:

CGContextSetShadowWithColor not working

This code should be showing a shadow, but it isn't:

UIImage Resize without loss of quality

Im looking for an external library (or a method using Apple frameworks that doesn't destroy the quality) which will let me scale down images.