iphone app memory build up

问题

Trying to diagnose why my game is building up memory, causing it to eventually slow down to the point of unresponsiveness. Based on previously asked questions, i think i might know what's causing it, not sure though, so i will just post what i think it might be.

[self performSelector:@selector(createObstacle0) withObject:nil afterDelay:1.0];
[self performSelector:@selector(score0) withObject:nil afterDelay:1];

....

-(void)createObstacle0 {
int yMin = (CGRectGetMidY(self.frame)+190);
int yMax = (CGRectGetMidY(self.frame)+270);
CGPoint startPoint = CGPointMake(-20, yMin + arc4random_uniform(yMax - yMin));
SKSpriteNode *obstacle = [SKSpriteNode spriteNodeWithImageNamed:@"obstacle"];
obstacle.position = CGPointMake(startPoint.x, startPoint.y);
obstacle.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:21.5];
obstacle.physicsBody.categoryBitMask = enemyCategory;
obstacle.physicsBody.contactTestBitMask = playerCategory;
obstacle.physicsBody.dynamic = NO;
obstacle.name = @"obstacle0";
[self addChild:obstacle];
[obstacle runAction:[SKAction moveTo:CGPointMake(340, startPoint.y) duration:minTime + arc4random_uniform(maxTime - minTime)]];
float randomNum = arc4random_uniform(3.0) + 0.1;
[self performSelector:@selector(createObstacle0) withObject:nil afterDelay:randomNum];
}

-(void)score0 {

[self enumerateChildNodesWithName:@"obstacle0" usingBlock:^(SKNode *node, BOOL *stop) {
    if (node.position.x > 330) {
        score++;
        scorelabel.text = [NSString stringWithFormat:@"%lu",(unsigned long)score];
        [node removeFromParent];
    }

}];
[self performSelector:@selector(score0) withObject:nil afterDelay:.1];
}

I read here that perferomSelector can cause some memory problems. For me, after playing my game just once, i can sit at the main menu and both cpu and memory will just continue to rise. No idea what's going on and appreciate all help. Is the code i have here to blame?

来源：https://stackoverflow.com/questions/23209740/iphone-app-memory-build-up