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My question is very straight forward: is the delegate design pattern in iOS truly multithreaded? Meaning is there actual parallel execution going on or is it still all running on the main thread?
It depends if you call the delegate methods on a different thread or not. In general, delegate methods are called on the same thread after a certain event. In short terms, threading has nothing to do with delegation and from my experience Apple always posts the delegate callbacks methods to the main thread (however, you can choose not to, but things can become nasty if you do).