Are multiple didBeginContact calls called simultaneously?

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Say two contacts happen at the exact same time. Will their didBeginContact function calls happen at the exact same time (in different threads I guess) or will one happen after the other?

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Steve Ives On

No - didBeginContact is called for every pair of nodes that contact in your scene. The parameter passed to it is an SKPhysicsContact which contains references to the 2 bodies - bodyA and bodyB - involved in the contact.

If 3 nodes (e.g. player, enemy and bomb) appear to contact each other simultaneously, then didBegincontact will be called 3 times - once for the player/enemy contact, once for the player/bomb contact and once for the enemy/bomb contact.

You mention contacts being detected in multiple threads - I can't remember reading this anywhere, but I don't think that having multiple threads controlling a SpriteKit scene is a good idea, if it's even possible.