Proper use of ARC (Automatic Reference Counting)?

Short answer is yes. Strong is the ARC equivalent of retain, and weak is the equivalent of assign, only it is also zeroing (sets the pointer to nil if the object is deallocated, preventing potential EXC_BAD_ACCESS crashes), so it is even better than assign. The Transitioning to ARC Release Notes page, as already mentioned, provides more details if you're interested.

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