Button with drop shadow for iPhone which also animates down when pressed.

ShadowButton.h

//
//  ShadowButton.h

#import <Foundation/Foundation.h>

@interface ShadowButton : UIButton {
}

@end

//
//  ShadowButton.m

#import "ShadowButton.h"
#import <QuartzCore/QuartzCore.h>

@implementation ShadowButton

-(void)setupView{

    self.layer.shadowColor = [UIColor blackColor].CGColor;
    self.layer.shadowOpacity = 0.5;
    self.layer.shadowRadius = 1;
    self.layer.shadowOffset = CGSizeMake(2.0f, 2.0f);

}

-(id)initWithFrame:(CGRect)frame{
    if((self = [super initWithFrame:frame])){
        [self setupView];
    }

    return self;
}

-(id)initWithCoder:(NSCoder *)aDecoder{
    if((self = [super initWithCoder:aDecoder])){
        [self setupView];
    }

    return self;
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    self.contentEdgeInsets = UIEdgeInsetsMake(1.0,1.0,-1.0,-1.0);
    self.layer.shadowOffset = CGSizeMake(1.0f, 1.0f);
    self.layer.shadowOpacity = 0.8;

    [super touchesBegan:touches withEvent:event];

}

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    self.contentEdgeInsets = UIEdgeInsetsMake(0.0,0.0,0.0,0.0);
    self.layer.shadowOffset = CGSizeMake(2.0f, 2.0f);
    self.layer.shadowOpacity = 0.5;

    [super touchesEnded:touches withEvent:event];

}

@end