ios - How to use "context" in " observeValueForKeyPath:ofObject:change:context:" -
having read kvo guide, kvc guide, kvo protocol ref, have never seen solid illustration on how/when utilize lastly parameter of observevalueforkeypath:ofobject:change:context:
the description on "context" vague in apple's document, examples through kvo/kvc!
can point out me? many thanks!!!
ios key-value-observing
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