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Spritenode misplaced in World Scene using Sprite Kit in Xcode-Objective C

I am building a platform game in Xcode 6.0 using Sprite Kit. The problem that I have is related to the "monster sprite node" which are created by the following method

-(void) generateMonster {
monster = [SKSpriteNode spriteNodeWithImageNamed:@"monster.png"];
monster.name = @"monster";
monster.size = CGSizeMake(monster.frame.size.width, monster.frame.size.height);
monster.position = CGPointMake(self.currentMonsterX, ground.position.y + monster.frame.size.height);
monster.zPosition = 3.0;
monster.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:monster.size];
monster.physicsBody.categoryBitMask = monsterCategory;

SKAction *moveRight = [SKAction moveByX:30.0 y:0 duration:1.0];
SKAction *moveLeft = [SKAction moveByX:-30.0 y:0 duration:0.5];
SKAction *pulseMovement = [SKAction sequence:@[moveRight, moveLeft]];
[monster runAction:[SKAction repeatActionForever:pulseMovement]];
[self.world addChild:monster];
self.currentMonsterX += (arc4random() % 400) + 100;
}

the position of monster in the debugging is OK "about 50.0", but when it placed to the other SKNode *World which contains all other contents like clouds, stars and hero, the monster.position.y gets a negative value which moves it way below "about -9000"!!?

Any help is appreciated.

Solution

  • My bad .. I had a little logic mistake in the order of creation .. Here is what I was doing, just in case someone else stuck with the same mistake.

    The problem was in the code line:

    monster.position = CGPointMake(self.currentMonsterX, ground.position.y + monster.frame.size.height);

    Precisely at "ground.position.y" since the node "ground" was not yet created and hence the monsters were falling and thus the -9000 or lower.

    Sorry about that.