UITapTapTap

UITapTapTap.h

//
//  UITapTapTap.h
//  Cat Toys
//
//  Created by Steven Mark Rose on 01/11/2010.
//  Copyright 2010 Second Reality. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface UITapTapTap : UIControl
{
@private
	UIButton * button;
	int stage;
	float stageTime;
	NSTimer * timer;
}

- (id)initWithFrame:(CGRect)aRect;
- (void)updateTimeDelta:(float)time;

@end

UITapTapTap.m

//
//  UITapTapTap.m
//  Cat Toys
//
//  Created by Steven Mark Rose on 01/11/2010.
//  Copyright 2010 Second Reality. All rights reserved.
//

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

@implementation UITapTapTap


- (id)initWithFrame:(CGRect)aRect
{
	if(self=[super initWithFrame:aRect])
	{
		stage=0;
		stageTime=0.0f;
		// Add an image for the background:
		button =[UIButton buttonWithType: UIButtonTypeCustom];
		[[button layer] setCornerRadius:8.0f];
		[[button layer] setMasksToBounds:YES];
		[button setTitle:@"Tap three times for menu" forState: UIControlStateNormal];
		[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
		[[button layer] setBackgroundColor:[[UIColor blackColor] CGColor]];
		button.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin;
	
		CGPoint titleCenter = {self.bounds.size.width/2, self.bounds.size.height/2};
		button.center=titleCenter;
		CGRect bounds={0,0, 300, 55};
		button.bounds=bounds;
		[button addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
		
		[self addSubview:button];
		
		timer=[NSTimer scheduledTimerWithTimeInterval:0.25f target:self selector:@selector(updateCounter:) userInfo:nil repeats:YES];
	}
	return self;
}

-(void)dealloc
{
	[button release];
	[timer invalidate];
	[super dealloc];
}

- (void)buttonPressed:(id)sender
{
	stage++;
	if(stage==1)
	{
		[button setTitle:@"Tap twice more!" forState: UIControlStateNormal];
		stageTime=0.0f;
	}
	else if(stage==2)
	{
		[button setTitle:@"Tap once more!" forState: UIControlStateNormal];
		stageTime=0.0f;
	}
	else if(stage==3)
	{
		[super sendActionsForControlEvents:UIControlEventValueChanged];
		stageTime=0.0f;
	}
}

- (void)updateTimeDelta:(float)time
{
	stageTime+=time;
	if(stageTime>5.0f)
	{
		[button setTitle:@"Tap three times for menu" forState: UIControlStateNormal];
		stage=0;
		stageTime=0.0f;
	}
}

- (void)updateCounter:(NSTimer *)timer
{
	[self updateTimeDelta:1.0f];
}

@end

This class is used for the menu button on the game screen. You have to press it three times within a time period otherwise the it will not activate. The purpose is to prevent cats from getting to the main menu.