Определить, какой экземпляр SKSpriteNode был затронут?

Я использую этот код, чтобы определить и посмотреть, было ли касание пользователя внутри рамки моего SKSpriteNode, и если это так, удалить узел с экрана. Но я только хочу, чтобы узел, который был использован, исчез.

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
/* Called when a touch begins */

    for (UITouch *touch in touches) {
            CGPoint location = [touch locationInNode:self];

        if ((location.x > self.crate.frame.origin.x && location.x < self.crate.frame.origin.x + self.crate.frame.size.width) &&
            (location.y > self.crate.frame.origin.y && location.y < self.crate.frame.origin.y + self.crate.frame.size.height)) {

            [self.crate removeFromParent];
        }
    }
}

В моем методе обновления я вызываю метод addCrate: для порождения узла каждую секунду.

- (void)updateWithTimeSinceLastUpdate:(CFTimeInterval)timeSinceLast {

    self.lastSpawnTimeInterval += timeSinceLast;
    if (self.lastSpawnTimeInterval > 1) {
        self.lastSpawnTimeInterval = 0;
        [self addCrate];
    }
}

- (void)update:(NSTimeInterval)currentTime {
    // Handle time delta.
    // If we drop below 60fps, we still want everything to move the same distance.
    CFTimeInterval timeSinceLast = currentTime - self.lastUpdateTimeInterval;
    self.lastUpdateTimeInterval = currentTime;
    if (timeSinceLast > 1) { // more than a second since last update
        timeSinceLast = 1.0 / 60.0;
        self.lastUpdateTimeInterval = currentTime;
    }

    [self updateWithTimeSinceLastUpdate:timeSinceLast];

}

Это метод, который он вызывает.

- (void)addCrate {

    // Create sprite
        self.crate = [SKSpriteNode spriteNodeWithColor:[UIColor redColor] size:CGSizeMake(30, 30)];
        //self.crate.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.crate.frame.size];

    // Determine where to spawn the crate along the X axis
        int minX = self.crate.size.width / 2;
        int maxX = self.frame.size.width - self.crate.size.width / 2;
        int rangeX = maxX - minX;
        int actualX = (arc4random_uniform(rangeX)) + minX;

    // Create the crate slightly off-screen along the top,
    // and along a random position along the X axis as calculated above
        self.crate.position = CGPointMake(actualX, self.frame.size.height + self.crate.size.height/2);
        [self addChild:self.crate];
        self.crate.size = CGSizeMake(50, 50);


    // Determine speed of the crate
        int actualDuration = 3.5;

    // Create the actions
        SKAction * actionMove = [SKAction moveTo:CGPointMake(actualX, -self.crate.size.height/2) duration:actualDuration];
        SKAction * actionMoveDone = [SKAction removeFromParent];
        [self.crate runAction:[SKAction sequence:@[actionMove, actionMoveDone]]];
}

Но когда запускаю на своем айфоне, только иногда регистрируется тап и снимается блок с экрана, а иногда нет. Опять же, я хочу, чтобы узел, на который нажали, исчез, и только этот узел.

Благодарю вас!

U1:

-(id)initWithSize:(CGSize)size {
    if (self = [super initWithSize:size]) {

        self.backgroundColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
        [self addCrate];
    }
        return self;
}

- (void)addCrate {

    // Create sprite
        self.crate = [SKSpriteNode spriteNodeWithColor:[UIColor redColor] size:CGSizeMake(30, 30)];
    self.crate.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(30, 30)];
        self.crate.userInteractionEnabled = YES;
        //self.crate.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.crate.frame.size];

    // Determine where to spawn the crate along the X axis
        int minX = self.crate.size.width / 2;
        int maxX = self.frame.size.width - self.crate.size.width / 2;
        int rangeX = maxX - minX;
        int actualX = (arc4random_uniform(rangeX)) + minX;

    // Create the crate slightly off-screen along the top,
    // and along a random position along the X axis as calculated above
        self.crate.position = CGPointMake(actualX, self.frame.size.height + self.crate.size.height/2);
        [self addChild:self.crate];
        self.crate.size = CGSizeMake(50, 50);


    // Determine speed of the crate
        int actualDuration = 3.5;

    // Create the actions
        SKAction * actionMove = [SKAction moveTo:CGPointMake(actualX, -self.crate.size.height/2) duration:actualDuration];
        SKAction * actionMoveDone = [SKAction removeFromParent];
        [self.crate runAction:[SKAction sequence:@[actionMove, actionMoveDone]]];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInNode:self];
    SKNode *touchedNode = [self nodeAtPoint:touchLocation];

    NSLog(@"touchLocation x: %f and y: %f", touchLocation.x, touchLocation.y);

    if (touchedNode != self) {
        NSLog(@"Removed from parent.");
        [touchedNode removeFromParent];
    }
}


- (void)updateWithTimeSinceLastUpdate:(CFTimeInterval)timeSinceLast {

    self.lastSpawnTimeInterval += timeSinceLast;
    if (self.lastSpawnTimeInterval > 1) {
        self.lastSpawnTimeInterval = 0;
        [self addCrate];
    }
}

- (void)update:(NSTimeInterval)currentTime {
    // Handle time delta.
    // If we drop below 60fps, we still want everything to move the same distance.
    CFTimeInterval timeSinceLast = currentTime - self.lastUpdateTimeInterval;
    self.lastUpdateTimeInterval = currentTime;
    if (timeSinceLast > 1) { // more than a second since last update
        timeSinceLast = 1.0 / 60.0;
        self.lastUpdateTimeInterval = currentTime;
    }

    [self updateWithTimeSinceLastUpdate:timeSinceLast];

}