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?
Are multiple didBeginContact calls called simultaneously?
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No -
didBeginContactis called for every pair of nodes that contact in your scene. The parameter passed to it is anSKPhysicsContactwhich contains references to the 2 bodies -bodyAandbodyB- involved in the contact.If 3 nodes (e.g.
player,enemyandbomb) appear to contact each other simultaneously, thendidBegincontactwill 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.