Sprites and Bounding Box issues - ios

Question

I am making an IOs game for an assignment using cocos2D. So far I am just trying to get all of the menus done, but I am having some issues with bounding box when setting up some of my buttons.
The game starts with the cocos2D logoscreen, then transits into a splash screen for my game, then into the main menu. In the game menu I have 2 buttons: Begin, and Options. Both buttons are working perfectly fine, each makinga transicion to the correct scene.
I am currently working on the options menu scene, where I have a button to take care of volume, a butto to set game difficulty, and a button to go back to main menu. I have been trying to make the back button work, but is not triggering when touched, I placed an NSLog for debugging, and the touches are being detected, just the if statement that checks whether the sprite was touched oris never true. I am puzzled by this, since I am using the same method I used in my main menu (which works). I searched for similar issues before posting, but everything I tried, like altering the parent coordinate system and/or the sprites boundingbox.origin, haven't worked at all.
This is the code for my Options Scene:
#import "OptionsMenu.h"
#implementation OptionsMenu
+(CCScene *) scene
{
// 'scene' is an autorelease object.
CCScene *scene = [CCScene node];
// 'layer' is an autorelease object.
OptionsMenu *layer = [OptionsMenu node];
// add layer as a child to scene
[scene addChild: layer];
// return the scene
return scene;
}
-(id) init
{
if( (self=[super init]) ) {
self.touchEnabled = YES;
self.accelerometerEnabled = YES;
CGSize winSize = [[CCDirector sharedDirector] winSize];
CCSprite *background = [CCSprite spriteWithFile:#"Menu0.png"];
background.position = ccp(winSize.width/2, winSize.height/2);
[self addChild:background z:0];
CCSprite *volumeBar = [CCSprite spriteWithFile:#"VolumeBar.png"];
volumeBar.position = ccp(winSize.width/2, winSize.height/2);
[self addChild:volumeBar z:1];
CCSprite *volumeButton = [CCSprite spriteWithFile:#"VolumeButton.png"];
volumeButton.position = ccp(winSize.width/2, winSize.height/2);
[self addChild:volumeButton z:1];
CCSprite *difficultyButton = [CCSprite spriteWithFile:#"EasyButton.png"];
difficultyButton.position = ccp(winSize.width/2, winSize.height/2-55);
[self addChild:difficultyButton z:1];
CCSprite *backButton = [CCSprite spriteWithFile:#"BackButton.png"];
backButton.position = ccp(winSize.width/12, winSize.height/8);
[self addChild:backButton z:1];
[self scheduleUpdate];
}
return self;
}
- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
//Add a new body/atlas sprite at the touched location
for( UITouch *touch in touches ) {
CGPoint location = [touch locationInView: [touch view]];
location = [[CCDirector sharedDirector] convertToGL: location];
CCActionInterval *actionInterval = [CCActionInterval actionWithDuration:0.1];
if (CGRectContainsPoint([self.backButton boundingBox], location)) {
[self.backButton setTexture:[[CCTextureCache sharedTextureCache] addImage:#"BackButton.png"]];
id actionCallFunc = [CCCallFunc actionWithTarget:self selector:#selector(goToMainMenu:)];
[self.background runAction: [CCSequence actions: actionInterval, actionCallFunc, nil]];
}
else if (CGRectContainsPoint([self.difficultyButton boundingBox], location)) {
[self.volumeButton setTexture:[[CCTextureCache sharedTextureCache] addImage:#"VolumeButton.png"]];
}
}
}
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
//Add a new body/atlas sprite at the touched location
for( UITouch *touch in touches ) {
CGPoint location = [touch locationInView: [touch view]];
NSLog(#"Touch");
//missileButton* missileButton;
location = [[CCDirector sharedDirector] convertToGL: location];
if (CGRectContainsPoint([self.backButton boundingBox], location))
{
[self.backButton setTexture:[[CCTextureCache sharedTextureCache]addImage:#"BackButtonPressed.png"]];
NSLog(#"BackButtonTouched");
}
else if (CGRectContainsPoint([self.volumeButton boundingBox], location))
[self.volumeButton setTexture:[[CCTextureCache sharedTextureCache]addImage:#"VolumeButtonPressed.png"]];
}
}
-(void) goToMainMenu:(id) sender
{
[[CCDirector sharedDirector] replaceScene: [CCTransitionSlideInR transitionWithDuration:2 scene:[MainMenu node]]];
}
#end
I would appreciate any help in solving this issue.

Answer 1

Your self.backButton is never defined. Change your init function to the following (I'm assuming all of your CCSprite defines are actually properties:
-(id) init
{
if( (self=[super init]) ) {
self.touchEnabled = YES;
self.accelerometerEnabled = YES;
CGSize winSize = [[CCDirector sharedDirector] winSize];
_background = [CCSprite spriteWithFile:#"Menu0.png"];
_background.position = ccp(winSize.width/2, winSize.height/2);
[self addChild:_background z:0];
_volumeBar = [CCSprite spriteWithFile:#"VolumeBar.png"];
_volumeBar.position = ccp(winSize.width/2, winSize.height/2);
[self addChild:_volumeBar z:1];
_volumeButton = [CCSprite spriteWithFile:#"VolumeButton.png"];
_volumeButton.position = ccp(winSize.width/2, winSize.height/2);
[self addChild:_volumeButton z:1];
_difficultyButton = [CCSprite spriteWithFile:#"EasyButton.png"];
_difficultyButton.position = ccp(winSize.width/2, winSize.height/2-55);
[self addChild:_difficultyButton z:1];
_backButton = [CCSprite spriteWithFile:#"BackButton.png"];
_backButton.position = ccp(winSize.width/12, winSize.height/8);
[self addChild:_backButton z:1];
[self scheduleUpdate];
}
return self;
}

Answer 2

Another approach would be to use CCMenu and CCMenuItemSprite for all of your buttons. These classes make simple buttons for menus much easier to implement. Most/all of the touch handling is done for you and there are variants that use selectors or blocks for handling the button press.
This would save you a lot of code, and trouble.