DropdownButton

DropdownButton.h

@interface DropdownButton : UIControl {
    
}

@property (nonatomic, assign) CAGradientLayer *gradientLayer;
@property (nonatomic, assign) CAGradientLayer *dropdownLayer;
@property (nonatomic, assign) CAShapeLayer *triangleLayer;

@property (nonatomic, retain) UILabel *label;

- (void)initializeView;
- (void)setText:(NSString*)text;
- (NSString*)text;

@end

DropdownButton.m

#import "DropdownButton.h"

@implementation DropdownButton

@synthesize gradientLayer;
@synthesize dropdownLayer;
@synthesize triangleLayer;
@synthesize label;

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

- (id)init
{
  self = [super init];
  if (self) {
    [self initializeView];
  }
  return self;  
}

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

- (void)dealloc
{
  [label release], label = nil;
  [super dealloc];
}

- (void)initializeView
{
  [[self layer] setBorderColor:[[UIColor darkGrayColor] CGColor]];
  [[self layer] setBorderWidth:1.0f];
  [[self layer] setCornerRadius:8.0f];
  [[self layer] setMasksToBounds:YES];
  
  if (!gradientLayer) {
    gradientLayer = [CAGradientLayer layer];
    [gradientLayer setBounds:[self bounds]];
    [gradientLayer setPosition:CGPointMake([self bounds].size.width/2.0f, [self bounds].size.height/2.0f)];
    [gradientLayer setColors:[NSArray arrayWithObjects:(id)[[UIColor colorWithRed:253.0f/255.0f green:253.0f/255.0f blue:253.0f/255.0f alpha:1.0f] CGColor], (id)[[UIColor colorWithRed:191.0f/255.0f green:191.0f/255.0f blue:191.0f/255.0f alpha:1.0f] CGColor], nil]];
    [[self layer] addSublayer:gradientLayer];
  }
  
  if (!dropdownLayer) {
    dropdownLayer = [CAGradientLayer layer];
    [dropdownLayer setBorderColor:[[UIColor darkGrayColor] CGColor]];
    [dropdownLayer setBorderWidth:1.0f];
    [dropdownLayer setBounds:CGRectMake(0.0f, 0.0f, 31.0f, [self bounds].size.height+2)];
    CGPoint point = CGPointMake([self bounds].size.width - 15.0f, [self bounds].size.height/2.0f);
    [dropdownLayer setPosition:point];
    [dropdownLayer setColors:[NSArray arrayWithObjects:(id)[[UIColor colorWithRed:141.0f/255.0f green:141.0f/255.0f blue:141.0f/255.0f alpha:1.0f] CGColor], (id)[[UIColor colorWithRed:100.0f/255.0f green:100.0f/255.0f blue:100.0f/255.0f alpha:1.0f] CGColor], nil]];
    [[self layer] addSublayer:dropdownLayer];
    
  }
  
  if (!triangleLayer) {
    triangleLayer = [CAShapeLayer layer];
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, nil, 0.0f, 0.0f);
    CGPathAddLineToPoint(path, nil, 10.0f, 0.0f);
    CGPathAddLineToPoint(path, nil, 5.0f, 10.0f);
    CGPathAddLineToPoint(path, nil, 0.0f, 0.0f);
    [triangleLayer setPath:path];
    CGPathRelease(path);
    [triangleLayer setFillColor:[[UIColor whiteColor] CGColor]];
    CGRect boundingBox = CGPathGetBoundingBox(path);
    [triangleLayer setBounds:boundingBox];
    [triangleLayer setPosition:CGPointMake([dropdownLayer bounds].size.width/2.0f, [dropdownLayer bounds].size.height/2.0f)];
    [dropdownLayer addSublayer:triangleLayer];
  }
  
  if (!label) {
    label = [[UILabel alloc] init];
    CGRect startRect = [self bounds];
    startRect.origin.x = 10.0f;
    [label setUserInteractionEnabled:NO];
    [label setFrame:startRect];
    [label setBackgroundColor:[UIColor clearColor]];
    [self addSubview:label];
  }  
}

- (void)setText:(NSString*)txt
{
  [[self label] setText:txt];
}

- (NSString*)text
{
  return [[self label] text];
}


@end

Here is an image of what the button looks like when displayed.