I have been struggling for the past two days to get two SKSpriteNodes to register a collision and evoke didBegin#contact. I've set their bit masks 'categoryBitMask', 'contactTestBitMask' and 'coll...

I am trying to keep my SKSpriteNodes moving at a constant speed forever, even after collisions. I have set gravity to 0, friction to 0, and linear and angular dampening to zero, but the Sprites sti...

I have a SKSpriteNode with a dynamic physics body on a SKNode *_fgLayer. Now, when I pause or unpause the game I want that SKSpriteNode to remain in place and not rotate or fall down. If I simply ...

I'm building a game with balls bouncing within the iPad's screen. Similar to a Pong game. I see that SKScene's SKPhysicsWorld has gravity property, and also controls how objects collide with each o...