Code only working on iOS 7 - ios

Question

Hi I've been making a game with the SpriteKit framework and I set a collision bit mask when 2 objects collide. One of those objects, let's say the object A, can have 2 states: black or normal so when the two objects collide and the A object is on normal state it adds a point but when the two objects collide and the A object is on black state the game is over. This code is working fine for me on iOS 7 but when I run it on iOS 8 and if the A object state is black it acts like if it's on normal state and adds a point. Why this is happening? Is different the code for iOS 7 and 8? Please can anyone help me, here's the code:
-(void)didBeginContact:(SKPhysicsContact *)contact {
SKPhysicsBody *firstBody;
SKPhysicsBody *secondBody;
if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask) {
firstBody = contact.bodyA;
secondBody = contact.bodyB;
}else {
firstBody = contact.bodyB;
secondBody = contact.bodyA;
}
uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
if (firstBody.categoryBitMask == objectACategory && secondBody.categoryBitMask == objectBCategory) {
NSLog(#"OBJECT A CAUGHT");
[firstBody.node removeFromParent];
[GameState sharedInstance].score++;
_scoreLabel.text = [NSString stringWithFormat:#"%d", [GameState sharedInstance].score];
_scoreLabel_2.text = [NSString stringWithFormat:#"%d", [GameState sharedInstance].score];
gameUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"sound " ofType:#"wav"]];
_gameSound = [[AVAudioPlayer alloc] initWithContentsOfURL:gameUrl error:nil];
_gameSound.delegate = self;
[_gameSound play];
if ([[firstBody.node.userData valueForKey:#"Black"] boolValue]) {
[self removeActionForKey:origamiFallKey];
NSLog(#"YOU LOSE");
[self gameOver];
[self runAction:[SKAction sequence:#[
[SKAction waitForDuration:0.5],
[SKAction performSelector:#selector(removeWhenLose) onTarget:self]]]];
}
}
For setting the state I used this code in the method which adds a objectA:
// Black
if(arc4random_uniform(6) == 0) {
_objectA.texture = [SKTexture textureWithImageNamed:#"blackImage.png"];
_objectA.physicsBody.collisionBitMask = objectACategory;
_objectA.userData = [[NSMutableDictionary alloc] init];
[_objectA.userData setValue:#YES forKey:#"Black"];
blackObjectA = YES;
}

Answer 1

I finally solved this problem. First I had to create the collision variable:
uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
And with write the collisions using this:
-(void)didBeginContact:(SKPhysicsContact *)contact {
if (collision == (objectACategory | objectBCategory)) {
if ([[firstBody.node.userData valueForKey:#"Black"] boolValue]){
[self removeActionForKey:fallKey];
NSLog(#"YOU LOSE");
[self gameOver];
[self runAction:[SKAction sequence:#[
[SKAction waitForDuration:0.5],
[SKAction performSelector:#selector(removeWhenLose) onTarget:self]]]];
} else {
[firstBody.node removeFromParent];
[GameState sharedInstance].score++;
_scoreLabel.text = [NSString stringWithFormat:#"%d", [GameState sharedInstance].score];
_scoreLabel_2.text = [NSString stringWithFormat:#"%d", [GameState sharedInstance].score];
gameUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"origami " ofType:#"wav"]];
_gameSound = [[AVAudioPlayer alloc] initWithContentsOfURL:gameUrl error:nil];
_gameSound.delegate = self;
[_gameSound play];
}
}