Swift Delegate (contactDelegate) explanation -

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i've research lot on delegate means somehow understand doesn't fit explanation. tutorial:

    physicsworld.contactdelegate = self

and explanation: "this sets physics world have no gravity, , sets scene delegate notified when 2 physics bodies collide."

i thought delegate class uses protocol. have different explanation this? line do? thanks. (ignore gravity part, there's line of code)

a delegate is protocol, called "delegate protocol". class containing quoted line of code becomes delegate , gets messages of protocol in question. physicsworld contact delegate inform of collision. if delegate methods implemented (i.e. controller conforms delegate protocol), can take appropriate action when notified.

clear?


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