Trying to fix double tap bug.

MAConfirmButton.m

//
//  MAConfirmButton.m
//
//  Created by Mike on 11-03-28.
//  Copyright 2011 Mike Ahmarani. All rights reserved.
//

#import "MAConfirmButton.h"
#import "UIColor-Expanded.h"

#define kHeight 26.0
#define kPadding 20.0
#define kFontSize 14.0

@interface MAConfirmButton ()

@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *confirm;
@property (nonatomic, copy) NSString *disabled;
@property (nonatomic, retain) UIColor *tint;

- (void)toggle;
- (void)setupLayers;
- (void)cancel;
- (void)lighten;
- (void)darken;

@end

@implementation MAConfirmButton

@synthesize title, confirm, disabled, tint, toggleAnimation;

- (void)dealloc{
  [title release];
  [confirm release];
  [disabled release];
  [tint release];
  [super dealloc];
}

+ (MAConfirmButton *)buttonWithTitle:(NSString *)titleString confirm:(NSString *)confirmString{	
  MAConfirmButton *button = [[[super alloc] initWithTitle:titleString confirm:confirmString] autorelease];	
  return button;
}

+ (MAConfirmButton *)buttonWithDisabledTitle:(NSString *)disabledString{	
  MAConfirmButton *button = [[[super alloc] initWithDisabledTitle:disabledString] autorelease];	
  return button;
}

- (id)initWithDisabledTitle:(NSString *)disabledString{
  self = [super initWithFrame:CGRectZero];
  if(self != nil){
    disabled = [disabledString retain];
    
    toggleAnimation = MAConfirmButtonToggleAnimationLeft;
    
    self.layer.needsDisplayOnBoundsChange = YES;
    
    CGSize size = [disabled sizeWithFont:[UIFont boldSystemFontOfSize:kFontSize]];
    CGRect r = self.frame;
    r.size.height = kHeight;
    r.size.width = size.width+kPadding;
    self.frame = r;
    
    [self setTitle:disabled forState:UIControlStateNormal];
    [self setTitleColor:[UIColor colorWithWhite:0.6 alpha:1] forState:UIControlStateNormal];
    [self setTitleShadowColor:[UIColor colorWithWhite:1 alpha:1] forState:UIControlStateNormal];		
    
    self.titleLabel.textAlignment = UITextAlignmentCenter;
    self.titleLabel.shadowOffset = CGSizeMake(0, 1);
    self.titleLabel.backgroundColor = [UIColor clearColor];
    self.titleLabel.font = [UIFont boldSystemFontOfSize:kFontSize];
    self.tint = [UIColor colorWithWhite:0.85 alpha:1];	
    
    [self setupLayers];
  }	
  return self;	
}

- (id)initWithTitle:(NSString *)titleString confirm:(NSString *)confirmString{
  self = [super initWithFrame:CGRectZero];
  if(self != nil){
    
    self.title = [titleString retain];
    self.confirm = [confirmString retain];
    
    toggleAnimation = MAConfirmButtonToggleAnimationLeft;
    
    self.layer.needsDisplayOnBoundsChange = YES;
    
    CGSize size = [title sizeWithFont:[UIFont boldSystemFontOfSize:kFontSize]];
    CGRect r = self.frame;
    r.size.height = kHeight;
    r.size.width = size.width+kPadding;
    self.frame = r;
    
    [self setTitle:title forState:UIControlStateNormal];
    [self setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];		
    [self setTitleShadowColor:[UIColor colorWithWhite:0 alpha:0.5] forState:UIControlStateNormal];
    
    self.titleLabel.textAlignment = UITextAlignmentCenter;
    self.titleLabel.shadowOffset = CGSizeMake(0, -1);
    self.titleLabel.backgroundColor = [UIColor clearColor];
    self.titleLabel.font = [UIFont boldSystemFontOfSize:kFontSize];
    self.tint = [UIColor colorWithRed:0.220 green:0.357 blue:0.608 alpha:1];
    
    [self setupLayers];
  }	
  return self;
}

- (void)toggle{
  
  self.titleLabel.alpha = 0;
  
  CGSize size;
  
  if(disabled){
    [self setTitle:disabled forState:UIControlStateNormal];
    [self setTitleColor:[UIColor colorWithWhite:0.6 alpha:1] forState:UIControlStateNormal];
    [self setTitleShadowColor:[UIColor colorWithWhite:1 alpha:1] forState:UIControlStateNormal];
    self.titleLabel.shadowOffset = CGSizeMake(0, 1);
    size = [disabled sizeWithFont:[UIFont boldSystemFontOfSize:kFontSize]];
  }else if(selected){
    [self setTitle:confirm forState:UIControlStateNormal];		
    size = [confirm sizeWithFont:[UIFont boldSystemFontOfSize:kFontSize]];
  }else{
    [self setTitle:title forState:UIControlStateNormal];
    size = [title sizeWithFont:[UIFont boldSystemFontOfSize:kFontSize]];
  }
  
  size.width += kPadding;
  float offset = size.width - self.frame.size.width;
  
    self.userInteractionEnabled = NO;
    
  [CATransaction begin];
  [CATransaction setAnimationDuration:0.25];
  [CATransaction setCompletionBlock:^{
    //Readjust button frame for new touch area, move layers back now that animation is done
    
      [CATransaction setCompletionBlock:^{
          self.userInteractionEnabled = YES;
      }];
      
    CGRect frameRect = self.frame;
    switch (self.toggleAnimation) {
      case MAConfirmButtonToggleAnimationLeft:
        frameRect.origin.x = frameRect.origin.x - offset;
        break;
      case MAConfirmButtonToggleAnimationRight:
        break;
      default:
        break;
    }
    frameRect.size.width = frameRect.size.width + offset;
    self.frame = frameRect;
    
    [CATransaction setDisableActions:YES];
    for(CALayer *layer in self.layer.sublayers){
      CGRect rect = layer.frame;
      switch (self.toggleAnimation) {
        case MAConfirmButtonToggleAnimationLeft:
          rect.origin.x = rect.origin.x+offset;
          break;
        case MAConfirmButtonToggleAnimationRight:
          break;
        default:
          break;
      }
      
      layer.frame = rect;
    }
    [CATransaction commit];
    
    self.titleLabel.alpha = 1;
    [self setNeedsLayout];
  }];
  
  UIColor *greenColor = [UIColor colorWithRed:0.439 green:0.741 blue:0.314 alpha:1.];
  
  //Animate color change
  CABasicAnimation *colorAnimation = [CABasicAnimation animationWithKeyPath:@"backgroundColor"];
  colorAnimation.removedOnCompletion = NO;
  colorAnimation.fillMode = kCAFillModeForwards;
  
  if(disabled){
    colorAnimation.fromValue = (id)greenColor.CGColor;
    colorAnimation.toValue = (id)[UIColor colorWithWhite:0.85 alpha:1].CGColor;
  }else{
    colorAnimation.fromValue = selected ? (id)tint.CGColor : (id)greenColor.CGColor;
    colorAnimation.toValue = selected ? (id)greenColor.CGColor : (id)tint.CGColor;	
  }
  
  [colorLayer addAnimation:colorAnimation forKey:@"colorAnimation"];
  
  //Animate layer scaling
  for(CALayer *layer in self.layer.sublayers){
    CGRect rect = layer.frame;
    
    switch (self.toggleAnimation) {
      case MAConfirmButtonToggleAnimationLeft:
        rect.origin.x = rect.origin.x-offset;
        break;
      case MAConfirmButtonToggleAnimationRight:
        break;
      default:
        break;
    }
    rect.size.width = rect.size.width+offset;
    layer.frame = rect;
  }
  
  [CATransaction commit];
  
  [self setNeedsDisplay];
}

- (void)setupLayers{
  
  CAGradientLayer *bevelLayer = [CAGradientLayer layer];
  bevelLayer.frame = CGRectMake(0, 0, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame));		
  bevelLayer.colors = [NSArray arrayWithObjects:(id)[UIColor colorWithWhite:0 alpha:0.5].CGColor, [UIColor whiteColor].CGColor, nil];
  bevelLayer.cornerRadius = 4.0;
  bevelLayer.needsDisplayOnBoundsChange = YES;
  
  colorLayer = [CALayer layer];
  colorLayer.frame = CGRectMake(0, 1, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame)-2);		
  colorLayer.borderColor = [UIColor colorWithWhite:0 alpha:0.1].CGColor;
  colorLayer.backgroundColor = tint.CGColor;
  colorLayer.borderWidth = 1.0;	
  colorLayer.cornerRadius = 4.0;
  colorLayer.needsDisplayOnBoundsChange = YES;		
  
  CAGradientLayer *colorGradient = [CAGradientLayer layer];
  colorGradient.frame = CGRectMake(0, 1, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame)-2);		
  colorGradient.colors = [NSArray arrayWithObjects:(id)[UIColor colorWithWhite:1 alpha:0.1].CGColor, [UIColor colorWithWhite:0.2 alpha:0.1].CGColor , nil];		
  colorGradient.locations = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0], [NSNumber numberWithFloat:1.0], nil];		
  colorGradient.cornerRadius = 4.0;
  colorGradient.needsDisplayOnBoundsChange = YES;	
  
  [self.layer addSublayer:bevelLayer];
  [self.layer addSublayer:colorLayer];
  [self.layer addSublayer:colorGradient];
  [self bringSubviewToFront:self.titleLabel];
  
}

- (void)setSelected:(BOOL)s{	
  selected = s;
  [self toggle];
}

- (void)disableWithTitle:(NSString *)disabledString{
  self.disabled = [disabledString retain];
  [self toggle];	
}

- (void)setAnchor:(CGPoint)anchor{
  //Top-right point of the view (MUST BE SET LAST)
  CGRect rect = self.frame;
  rect.origin = CGPointMake(anchor.x - rect.size.width, anchor.y);
  self.frame = rect;
}

- (void)setTintColor:(UIColor *)color{
  self.tint = [UIColor colorWithHue:color.hue saturation:color.saturation+0.15 brightness:color.brightness alpha:1];
  colorLayer.backgroundColor = tint.CGColor;
  [self setNeedsDisplay];
}

- (void)darken{
  darkenLayer = [CALayer layer];
  darkenLayer.frame = CGRectMake(0, 0, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame));
  darkenLayer.backgroundColor = [UIColor colorWithWhite:0 alpha:0.2].CGColor;
  darkenLayer.cornerRadius = 4.0;
  darkenLayer.needsDisplayOnBoundsChange = YES;
  [self.layer addSublayer:darkenLayer];
}

- (void)lighten{
  if(darkenLayer){
    [darkenLayer removeFromSuperlayer];
    darkenLayer = nil;
  }
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    if (self.userInteractionEnabled) {
        if(!disabled && !confirmed){
            [self darken];
        }
        [super touchesBegan:touches withEvent:event];
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    if (self.userInteractionEnabled) {
        if(!disabled && !confirmed){
            if(!CGRectContainsPoint(self.frame, [[touches anyObject] locationInView:self.superview])){ //TouchUpOutside (Cancelled Touch)
                [self lighten];
                [super touchesCancelled:touches withEvent:event];
            }else if(selected){
                [self lighten];
                confirmed = YES;
                [cancelOverlay removeFromSuperview];
                cancelOverlay = nil;
                [super touchesEnded:touches withEvent:event];
            }else{
                [self lighten];			
                self.selected = YES;		
                cancelOverlay = [UIButton buttonWithType:UIButtonTypeCustom];
                [cancelOverlay setFrame:CGRectMake(0, 0, 1024, 1024)];
                [cancelOverlay addTarget:self action:@selector(cancel) forControlEvents:UIControlEventTouchDown];
                [self.superview addSubview:cancelOverlay];
                [self.superview bringSubviewToFront:self];
            }
        }
    }
}

- (void)cancel{
  if(cancelOverlay){
    [cancelOverlay removeFromSuperview];
    cancelOverlay = nil;	
  }	
  self.selected = NO;
}

@end