Sprite not keeping track of count - ios

Question

The following code I'm using is to end the game when I my number of balls in the scene reaches zero. Now I'm not getting any error when I put the code in but it doesn't do any thing as of counting the balls and reacting to that count. I am fairly new to sprite kit so I understand that this is a problem that comes so easy to others but this is the first time of worked with reacting to the count of a certain sprite in a scene so please help.
SKSpriteNode *ball;
int numberOfBalls = 3;
#implementation EasyScene
-(void)didBeginContact:(SKPhysicsContact *)contact {
if ([self isGameWon]) {
EasyEndGameScene *end = [EasyEndGameScene sceneWithSize:self.size];
[self.view presentScene:end transition:[SKTransition doorsCloseHorizontalWithDuration:1]];
}
}
-(BOOL)isGameWon {
int numberOfBalls = 3;
for (SKNode* node in self.children) {
if ([node.name isEqual: ball]) {
numberOfBalls = 0;
}
}
return numberOfBalls =0;
}
- (void) addBalls:(CGSize)size {
for (int i = 0; i < 3; i++) {
//create brick sprite from image
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:#"ball-image"];
ball.name = #"ball";
//resize balls
ball.size = CGSizeMake(self.size.width/5.5, self.size.width/5.5);
//position and space out balls
int xPos = size.width/3 * (i+.5);
int yPos = self.size.height - (self.size.width/7);
ball.position = CGPointMake(xPos, yPos);
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.size.width/2];
ball.physicsBody.categoryBitMask = ballCategory;
ball.physicsBody.contactTestBitMask = bottomEdgeCategory;
[self addChild:ball];
}
}
In the following code I got rid of the Global Variable and tested all nodes for the specified name of #"ball" and return YES if none were found:
static const uint32_t ballCategory = 1; //00000000000000000000000000000001
static const uint32_t edgeCategory = 2; //00000000000000000000000000000010
static const uint32_t bottomEdgeCategory = 4; //00000000000000000000000000000100
SKSpriteNode *ball;
#implementation EasyScene
-(void)didBeginContact:(SKPhysicsContact *)contact {
//create placeholder for the "non ball" object
SKPhysicsBody *notTheBall;
SKPhysicsBody *theBall;
if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask) {
notTheBall = contact.bodyB;
theBall = contact.bodyA;
} else {
notTheBall = contact.bodyA;
theBall = contact.bodyB;
}
if (notTheBall.categoryBitMask == bottomEdgeCategory) {
NSLog(#"hit bottom edge");
// SKAction *playSFX = [SKAction playSoundFileNamed:#"gameover.mp3" waitForCompletion:NO];
// [self runAction:playSFX];
// EasyEndGameScene *end = [EasyEndGameScene sceneWithSize:self.size];
// [self.view presentScene:end transition:[SKTransition doorsCloseHorizontalWithDuration:1]];
// [GameState sharedInstance].score = 0;
// [gameMusic pause];
[theBall.node removeFromParent];
}
if ([self isGameWon]) {
EasyEndGameScene *end = [EasyEndGameScene sceneWithSize:self.size];
[self.view presentScene:end transition:[SKTransition doorsCloseHorizontalWithDuration:1]];
}
}
-(BOOL)isGameWon {
unsigned count = 0;
for (SKNode* node in self.children)
if ([node.name isEqual:ball])
count++;
return count == 0;
}
- (void) addBalls:(CGSize)size {
for (int i = 0; i < 3; i++) {
//create brick sprite from image
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:#"ball-image"];
ball.name = #"ball";
//resize balls
ball.size = CGSizeMake(self.size.width/5.5, self.size.width/5.5);
//position and space out balls
int xPos = size.width/3 * (i+.5);
int yPos = self.size.height - (self.size.width/7);
ball.position = CGPointMake(xPos, yPos);
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.size.width/2];
ball.physicsBody.categoryBitMask = ballCategory;
ball.physicsBody.contactTestBitMask = bottomEdgeCategory;
[self addChild:ball];
}
}

Answer 1

Remove the ball global variable, as it's not needed.
Test all nodes for the specified name of #"ball" and return YES if none were found:
-(BOOL)isGameWon {
for (SKNode* node in self.children)
if ([node.name isEqualToString:#"ball"])
return NO;
return YES;
}

Answer 2

I think it should be
return numberOfBalls == 0
in your isgameWon method
you forget an extra =